Program: CWE-119
Project: CVE-2017-8073
Buggy source:
/*
 * irc-ctcp.c - IRC CTCP protocol
 *
 * Copyright (C) 2003-2017 Sébastien Helleu <flashcode@flashtux.org>
 *
 * This file is part of WeeChat, the extensible chat client.
 *
 * WeeChat 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 3 of the License, or
 * (at your option) any later version.
 *
 * WeeChat 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 WeeChat.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <sys/utsname.h>
#include <locale.h>

#include "../weechat-plugin.h"
#include "irc.h"
#include "irc-ctcp.h"
#include "irc-channel.h"
#include "irc-color.h"
#include "irc-config.h"
#include "irc-msgbuffer.h"
#include "irc-nick.h"
#include "irc-protocol.h"
#include "irc-server.h"


struct t_irc_ctcp_reply irc_ctcp_default_reply[] =
{ { "clientinfo", "$clientinfo" },
  { "finger",     "WeeChat $versiongit" },
  { "source",     "$download" },
  { "time",       "$time" },
  { "userinfo",   "$username ($realname)" },
  { "version",    "WeeChat $versiongit ($compilation)" },
  { NULL,         NULL },
};


/*
 * Gets default reply for a CTCP query.
 *
 * Returns NULL if CTCP is unknown.
 */

const char *
irc_ctcp_get_default_reply (const char *ctcp)
{
    int i;

    for (i = 0; irc_ctcp_default_reply[i].name; i++)
    {
        if (weechat_strcasecmp (irc_ctcp_default_reply[i].name, ctcp) == 0)
            return irc_ctcp_default_reply[i].reply;
    }

    /* unknown CTCP */
    return NULL;
}

/*
 * Gets reply for a CTCP query.
 */

const char *
irc_ctcp_get_reply (struct t_irc_server *server, const char *ctcp)
{
    struct t_config_option *ptr_option;
    char option_name[512];

    snprintf (option_name, sizeof (option_name), "%s.%s", server->name, ctcp);

    /* search for CTCP in configuration file, for server */
    ptr_option = weechat_config_search_option (irc_config_file,
                                               irc_config_section_ctcp,
                                               option_name);
    if (ptr_option)
        return weechat_config_string (ptr_option);

    /* search for CTCP in configuration file */
    ptr_option = weechat_config_search_option (irc_config_file,
                                               irc_config_section_ctcp,
                                               ctcp);
    if (ptr_option)
        return weechat_config_string (ptr_option);

    /*
     * no CTCP reply found in config, then return default reply, or NULL
     * for unknown CTCP
     */
    return irc_ctcp_get_default_reply (ctcp);
}

/*
 * Displays CTCP requested by a nick.
 */

void
irc_ctcp_display_request (struct t_irc_server *server,
                          time_t date,
                          const char *command,
                          struct t_irc_channel *channel,
                          const char *nick,
                          const char *address,
                          const char *ctcp,
                          const char *arguments,
                          const char *reply)
{
    /* CTCP blocked and user doesn't want to see message? then just return */
    if (reply && !reply[0]
        && !weechat_config_boolean (irc_config_look_display_ctcp_blocked))
        return;

    weechat_printf_date_tags (
        irc_msgbuffer_get_target_buffer (
            server, nick, NULL, "ctcp",
            (channel) ? channel->buffer : NULL),
        date,
        irc_protocol_tags (command, "irc_ctcp", NULL, address),
        _("%sCTCP requested by %s%s%s: %s%s%s%s%s%s"),
        weechat_prefix ("network"),
        irc_nick_color_for_msg (server, 0, NULL, nick),
        nick,
        IRC_COLOR_RESET,
        IRC_COLOR_CHAT_CHANNEL,
        ctcp,
        IRC_COLOR_RESET,
        (arguments) ? " " : "",
        (arguments) ? arguments : "",
        (reply && !reply[0]) ? _(" (blocked)") : "");
}

/*
 * Displays reply from a nick to a CTCP query.
 */

void
irc_ctcp_display_reply_from_nick (struct t_irc_server *server, time_t date,
                                  const char *command, const char *nick,
                                  const char *address, char *arguments)
{
    char *pos_end, *pos_space, *pos_args, *pos_usec;
    struct timeval tv;
    long sec1, usec1, sec2, usec2, difftime;

    while (arguments && arguments[0])
    {
        pos_end = strrchr (arguments + 1, '\01');
        if (pos_end)
            pos_end[0] = '\0';

        pos_space = strchr (arguments + 1, ' ');
        if (pos_space)
        {
            pos_space[0] = '\0';
            pos_args = pos_space + 1;
            while (pos_args[0] == ' ')
            {
                pos_args++;
            }
            if (strcmp (arguments + 1, "PING") == 0)
            {
                pos_usec = strchr (pos_args, ' ');
                if (pos_usec)
                {
                    pos_usec[0] = '\0';

                    gettimeofday (&tv, NULL);
                    sec1 = atol (pos_args);
                    usec1 = atol (pos_usec + 1);
                    sec2 = tv.tv_sec;
                    usec2 = tv.tv_usec;

                    difftime = ((sec2 * 1000000) + usec2) -
                        ((sec1 * 1000000) + usec1);
                    weechat_printf_date_tags (
                        irc_msgbuffer_get_target_buffer (
                            server, nick, NULL, "ctcp", NULL),
                        date,
                        irc_protocol_tags (command, "irc_ctcp", NULL, NULL),
                        /* TRANSLATORS: %.3fs is a float number + "s" ("seconds") */
                        _("%sCTCP reply from %s%s%s: %s%s%s %.3fs"),
                        weechat_prefix ("network"),
                        irc_nick_color_for_msg (server, 0, NULL, nick),
                        nick,
                        IRC_COLOR_RESET,
                        IRC_COLOR_CHAT_CHANNEL,
                        arguments + 1,
                        IRC_COLOR_RESET,
                        (float)difftime / 1000000.0);

                    pos_usec[0] = ' ';
                }
            }
            else
            {
                weechat_printf_date_tags (
                    irc_msgbuffer_get_target_buffer (
                        server, nick, NULL, "ctcp", NULL),
                    date,
                    irc_protocol_tags (command, "irc_ctcp", NULL, address),
                    _("%sCTCP reply from %s%s%s: %s%s%s%s%s"),
                    weechat_prefix ("network"),
                    irc_nick_color_for_msg (server, 0, NULL, nick),
                    nick,
                    IRC_COLOR_RESET,
                    IRC_COLOR_CHAT_CHANNEL,
                    arguments + 1,
                    IRC_COLOR_RESET,
                    " ",
                    pos_args);
            }
            pos_space[0] = ' ';
        }
        else
        {
            weechat_printf_date_tags (
                irc_msgbuffer_get_target_buffer (
                    server, nick, NULL, "ctcp", NULL),
                date,
                irc_protocol_tags (command, NULL, NULL, address),
                _("%sCTCP reply from %s%s%s: %s%s%s%s%s"),
                weechat_prefix ("network"),
                irc_nick_color_for_msg (server, 0, NULL, nick),
                nick,
                IRC_COLOR_RESET,
                IRC_COLOR_CHAT_CHANNEL,
                arguments + 1,
                "",
                "",
                "");
        }

        if (pos_end)
            pos_end[0] = '\01';

        arguments = (pos_end) ? pos_end + 1 : NULL;
    }
}

/*
 * Displays CTCP replied to a nick.
 */

void
irc_ctcp_reply_to_nick (struct t_irc_server *server,
                        const char *command,
                        struct t_irc_channel *channel,
                        const char *nick, const char *ctcp,
                        const char *arguments)
{
    struct t_hashtable *hashtable;
    int number;
    char hash_key[32];
    const char *str_args;
    char *str_args_color;

    hashtable = irc_server_sendf (
        server,
        IRC_SERVER_SEND_OUTQ_PRIO_LOW | IRC_SERVER_SEND_RETURN_HASHTABLE,
        NULL,
        "NOTICE %s :\01%s%s%s\01",
        nick, ctcp,
        (arguments) ? " " : "",
        (arguments) ? arguments : "");

    if (hashtable)
    {
        if (weechat_config_boolean (irc_config_look_display_ctcp_reply))
        {
            number = 1;
            while (1)
            {
                snprintf (hash_key, sizeof (hash_key), "args%d", number);
                str_args = weechat_hashtable_get (hashtable, hash_key);
                if (!str_args)
                    break;
                str_args_color = irc_color_decode (str_args, 1);
                if (!str_args_color)
                    break;
                weechat_printf_date_tags (
                    irc_msgbuffer_get_target_buffer (
                        server, nick, NULL, "ctcp",
                        (channel) ? channel->buffer : NULL),
                    0,
                    irc_protocol_tags (
                        command,
                        "irc_ctcp,irc_ctcp_reply,self_msg,notify_none,"
                        "no_highlight",
                        NULL, NULL),
                    _("%sCTCP reply to %s%s%s: %s%s%s%s%s"),
                    weechat_prefix ("network"),
                    irc_nick_color_for_msg (server, 0, NULL, nick),
                    nick,
                    IRC_COLOR_RESET,
                    IRC_COLOR_CHAT_CHANNEL,
                    ctcp,
                    (str_args_color[0]) ? IRC_COLOR_RESET : "",
                    (str_args_color[0]) ? " " : "",
                    str_args_color);
                free (str_args_color);
                number++;
            }
        }
        weechat_hashtable_free (hashtable);
    }
}

/*
 * Replaces variables in CTCP format.
 *
 * Note: result must be freed after use.
 */

char *
irc_ctcp_replace_variables (struct t_irc_server *server, const char *format)
{
    char *res, *temp, *username, *realname;
    const char *info;
    time_t now;
    struct tm *local_time;
    char buf[1024];
    struct utsname *buf_uname;

    /*
     * $clientinfo: supported CTCP, example:
     *   ACTION DCC CLIENTINFO FINGER PING SOURCE TIME USERINFO VERSION
     */
    temp = weechat_string_replace (
        format, "$clientinfo",
        "ACTION DCC CLIENTINFO FINGER PING SOURCE TIME USERINFO VERSION");
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $git: git version (output of "git describe" for a development version
     * only, empty string if unknown), example:
     *   v0.3.9-104-g7eb5cc4
     */
    info = weechat_info_get ("version_git", "");
    temp = weechat_string_replace (res, "$git", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $versiongit: WeeChat version + git version (if known), examples:
     *   0.3.9
     *   0.4.0-dev
     *   0.4.0-dev (git: v0.3.9-104-g7eb5cc4)
     */
    info = weechat_info_get ("version_git", "");
    snprintf (buf, sizeof (buf), "%s%s%s%s",
              weechat_info_get ("version", ""),
              (info && info[0]) ? " (git: " : "",
              (info && info[0]) ? info : "",
              (info && info[0]) ? ")" : "");
    temp = weechat_string_replace (res, "$versiongit", buf);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $version: WeeChat version, examples:
     *   0.3.9
     *   0.4.0-dev
     */
    info = weechat_info_get ("version", "");
    temp = weechat_string_replace (res, "$version", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $compilation: compilation date, example:
     *   Dec 16 2012
     */
    info = weechat_info_get ("date", "");
    temp = weechat_string_replace (res, "$compilation", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $osinfo: info about OS, example:
     *   Linux 2.6.32-5-amd64 / x86_64
     */
    buf_uname = (struct utsname *)malloc (sizeof (struct utsname));
    if (buf_uname)
    {
        if (uname (buf_uname) >= 0)
        {
            snprintf (buf, sizeof (buf), "%s %s / %s",
                      buf_uname->sysname, buf_uname->release,
                      buf_uname->machine);
            temp = weechat_string_replace (res, "$osinfo", buf);
            free (res);
            if (!temp)
            {
                free (buf_uname);
                return NULL;
            }
            res = temp;
        }
        free (buf_uname);
    }

    /*
     * $site: WeeChat web site, example:
     *   https://weechat.org/
     */
    info = weechat_info_get ("weechat_site", "");
    temp = weechat_string_replace (res, "$site", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $download: WeeChat download page, example:
     *   https://weechat.org/download
     */
    info = weechat_info_get ("weechat_site_download", "");
    temp = weechat_string_replace (res, "$download", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $time: local date/time of user, example:
     *   Sun, 16 Dec 2012 10:40:48 +0100
     */
    now = time (NULL);
    local_time = localtime (&now);
    setlocale (LC_ALL, "C");
    strftime (buf, sizeof (buf),
              weechat_config_string (irc_config_look_ctcp_time_format),
              local_time);
    setlocale (LC_ALL, "");
    temp = weechat_string_replace (res, "$time", buf);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $username: user name, example:
     *   name
     */
    username = weechat_string_eval_expression (
        IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_USERNAME),
        NULL, NULL, NULL);
    if (username)
    {
        temp = weechat_string_replace (res, "$username", username);
        free (res);
        if (!temp)
            return NULL;
        res = temp;
        free (username);
    }

    /*
     * $realname: real name, example:
     *   John doe
     */
    realname = weechat_string_eval_expression (
        IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_REALNAME),
        NULL, NULL, NULL);
    if (realname)
    {
        temp = weechat_string_replace (res, "$realname", realname);
        free (res);
        if (!temp)
            return NULL;
        res = temp;
        free (realname);
    }

    /* return result */
    return res;
}

/*
 * Returns filename for DCC, without double quotes.
 *
 * Note: result must be freed after use.
 */

char *
irc_ctcp_dcc_filename_without_quotes (const char *filename)
{
    int length;

    length = strlen (filename);
    if (length > 0)
    {
        if ((filename[0] == '\"') && (filename[length - 1] == '\"'))
            return weechat_strndup (filename + 1, length - 2);
    }
    return strdup (filename);
}

/*
 * Parses CTCP DCC.
 */

void
irc_ctcp_recv_dcc (struct t_irc_server *server, const char *nick,
                   const char *arguments, char *message)
{
    char *dcc_args, *pos, *pos_file, *pos_addr, *pos_port, *pos_size;
    char *pos_start_resume, *filename;
    struct t_infolist *infolist;
    struct t_infolist_item *item;
    char charset_modifier[256];

    if (!arguments || !arguments[0])
        return;

    if (strncmp (arguments, "SEND ", 5) == 0)
    {
        arguments += 5;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* DCC filename */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* look for file size */
        pos_size = strrchr (pos_file, ' ');
        if (!pos_size)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }

        pos = pos_size;
        pos_size++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC port */
        pos_port = strrchr (pos_file, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }

        pos = pos_port;
        pos_port++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC IP address */
        pos_addr = strrchr (pos_file, ' ');
        if (!pos_addr)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }

        pos = pos_addr;
        pos_addr++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* remove double quotes around filename */
        filename = irc_ctcp_dcc_filename_without_quotes (pos_file);

        /* add DCC file via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "file_recv");
                weechat_infolist_new_var_string (item, "protocol_string", "dcc");
                weechat_infolist_new_var_string (item, "remote_nick", nick);
                weechat_infolist_new_var_string (item, "local_nick", server->nick);
                weechat_infolist_new_var_string (item, "filename",
                                                 (filename) ? filename : pos_file);
                weechat_infolist_new_var_string (item, "size", pos_size);
                weechat_infolist_new_var_string (item, "proxy",
                                                 IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_PROXY));
                weechat_infolist_new_var_string (item, "remote_address", pos_addr);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                (void) weechat_hook_signal_send ("xfer_add",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (filename)
            free (filename);

        free (dcc_args);
    }
    else if (strncmp (arguments, "RESUME ", 7) == 0)
    {
        arguments += 7;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* DCC filename */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* look for resume start position */
        pos_start_resume = strrchr (pos_file, ' ');
        if (!pos_start_resume)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_start_resume;
        pos_start_resume++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC port */
        pos_port = strrchr (pos_file, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_port;
        pos_port++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* remove double quotes around filename */
        filename = irc_ctcp_dcc_filename_without_quotes (pos_file);

        /* accept resume via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "file_recv");
                weechat_infolist_new_var_string (item, "filename",
                                                 (filename) ? filename : pos_file);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                weechat_infolist_new_var_string (item, "start_resume", pos_start_resume);
                (void) weechat_hook_signal_send ("xfer_accept_resume",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (filename)
            free (filename);

        free (dcc_args);
    }
    else if (strncmp (arguments, "ACCEPT ", 7) == 0)
    {
        arguments += 7;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* DCC filename */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* look for resume start position */
        pos_start_resume = strrchr (pos_file, ' ');
        if (!pos_start_resume)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_start_resume;
        pos_start_resume++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC port */
        pos_port = strrchr (pos_file, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_port;
        pos_port++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* remove double quotes around filename */
        filename = irc_ctcp_dcc_filename_without_quotes (pos_file);

        /* resume file via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "file_recv");
                weechat_infolist_new_var_string (item, "filename",
                                                 (filename) ? filename : pos_file);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                weechat_infolist_new_var_string (item, "start_resume", pos_start_resume);
                (void) weechat_hook_signal_send ("xfer_start_resume",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (filename)
            free (filename);

        free (dcc_args);
    }
    else if (strncmp (arguments, "CHAT ", 5) == 0)
    {
        arguments += 5;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* CHAT type */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* DCC IP address */
        pos_addr = strchr (pos_file, ' ');
        if (!pos_addr)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos_addr[0] = '\0';
        pos_addr++;
        while (pos_addr[0] == ' ')
        {
            pos_addr++;
        }

        /* look for DCC port */
        pos_port = strchr (pos_addr, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos_port[0] = '\0';
        pos_port++;
        while (pos_port[0] == ' ')
        {
            pos_port++;
        }

        if (weechat_strcasecmp (pos_file, "chat") != 0)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: unknown DCC CHAT type received from %s%s%s: \"%s\""),
                weechat_prefix ("error"),
                IRC_PLUGIN_NAME,
                irc_nick_color_for_msg (server, 0, NULL, nick),
                nick,
                IRC_COLOR_RESET,
                pos_file);
            free (dcc_args);
            return;
        }

        /* add DCC chat via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "chat_recv");
                weechat_infolist_new_var_string (item, "remote_nick", nick);
                weechat_infolist_new_var_string (item, "local_nick", server->nick);
                snprintf (charset_modifier, sizeof (charset_modifier),
                          "irc.%s.%s", server->name, nick);
                weechat_infolist_new_var_string (item, "charset_modifier", charset_modifier);
                weechat_infolist_new_var_string (item, "proxy",
                                                 IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_PROXY));
                weechat_infolist_new_var_string (item, "remote_address", pos_addr);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                (void) weechat_hook_signal_send ("xfer_add",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        free (dcc_args);
    }
}

/*
 * Receives a CTCP and if needed replies to query.
 */

void
irc_ctcp_recv (struct t_irc_server *server, time_t date, const char *command,
               struct t_irc_channel *channel, const char *address,
               const char *nick, const char *remote_nick, char *arguments,
               char *message)
{
    char *pos_end, *pos_space, *pos_args;
    const char *reply;
    char *decoded_reply;
    struct t_irc_channel *ptr_channel;
    struct t_irc_nick *ptr_nick;
    int nick_is_me;

    while (arguments && arguments[0])
    {
        pos_end = strrchr (arguments + 1, '\01');
        if (pos_end)
            pos_end[0] = '\0';

        pos_args = NULL;
        pos_space = strchr (arguments + 1, ' ');
        if (pos_space)
        {
            pos_space[0] = '\0';
            pos_args = pos_space + 1;
            while (pos_args[0] == ' ')
            {
                pos_args++;
            }
        }

        /* CTCP ACTION */
        if (strcmp (arguments + 1, "ACTION") == 0)
        {
            nick_is_me = (irc_server_strcasecmp (server, server->nick, nick) == 0);
            if (channel)
            {
                ptr_nick = irc_nick_search (server, channel, nick);
                irc_channel_nick_speaking_add (channel,
                                               nick,
                                               (pos_args) ?
                                               weechat_string_has_highlight (pos_args,
                                                                             server->nick) : 0);
                irc_channel_nick_speaking_time_remove_old (channel);
                irc_channel_nick_speaking_time_add (server, channel, nick,
                                                    time (NULL));
                weechat_printf_date_tags (
                    channel->buffer,
                    date,
                    irc_protocol_tags (
                        command,
                        (nick_is_me) ?
                        "irc_action,self_msg,notify_none,no_highlight" :
                        "irc_action,notify_message",
                        nick, address),
                    "%s%s%s%s%s%s%s",
                    weechat_prefix ("action"),
                    irc_nick_mode_for_display (server, ptr_nick, 0),
                    (ptr_nick) ? ptr_nick->color : ((nick) ? irc_nick_find_color (nick) : IRC_COLOR_CHAT_NICK),
                    nick,
                    (pos_args) ? IRC_COLOR_RESET : "",
                    (pos_args) ? " " : "",
                    (pos_args) ? pos_args : "");
            }
            else
            {
                ptr_channel = irc_channel_search (server, remote_nick);
                if (!ptr_channel)
                {
                    ptr_channel = irc_channel_new (server,
                                                   IRC_CHANNEL_TYPE_PRIVATE,
                                                   remote_nick, 0, 0);
                    if (!ptr_channel)
                    {
                        weechat_printf (
                            server->buffer,
                            _("%s%s: cannot create new private buffer \"%s\""),
                            weechat_prefix ("error"), IRC_PLUGIN_NAME,
                            remote_nick);
                    }
                }
                if (ptr_channel)
                {
                    if (!ptr_channel->topic)
                        irc_channel_set_topic (ptr_channel, address);

                    weechat_printf_date_tags (
                        ptr_channel->buffer,
                        date,
                        irc_protocol_tags (
                            command,
                            (nick_is_me) ?
                            "irc_action,self_msg,notify_none,no_highlight" :
                            "irc_action,notify_private",
                            nick, address),
                        "%s%s%s%s%s%s",
                        weechat_prefix ("action"),
                        (nick_is_me) ?
                        IRC_COLOR_CHAT_NICK_SELF : irc_nick_color_for_pv (ptr_channel, nick),
                        nick,
                        (pos_args) ? IRC_COLOR_RESET : "",
                        (pos_args) ? " " : "",
                        (pos_args) ? pos_args : "");
                    (void) weechat_hook_signal_send ("irc_pv",
                                                     WEECHAT_HOOK_SIGNAL_STRING,
                                                     message);
                }
            }
        }
        /* CTCP PING */
        else if (strcmp (arguments + 1, "PING") == 0)
        {
            reply = irc_ctcp_get_reply (server, arguments + 1);
            irc_ctcp_display_request (server, date, command, channel, nick,
                                      address, arguments + 1, pos_args, reply);
            if (!reply || reply[0])
            {
                irc_ctcp_reply_to_nick (server, command, channel, nick,
                                        arguments + 1, pos_args);
            }
        }
        /* CTCP DCC */
        else if (strcmp (arguments + 1, "DCC") == 0)
        {
            irc_ctcp_recv_dcc (server, nick, pos_args, message);
        }
        /* other CTCP */
        else
        {
            reply = irc_ctcp_get_reply (server, arguments + 1);
            if (reply)
            {
                irc_ctcp_display_request (server, date, command, channel, nick,
                                          address, arguments + 1, pos_args,
                                          reply);

                if (reply[0])
                {
                    decoded_reply = irc_ctcp_replace_variables (server, reply);
                    if (decoded_reply)
                    {
                        irc_ctcp_reply_to_nick (server, command, channel, nick,
                                                arguments + 1, decoded_reply);
                        free (decoded_reply);
                    }
                }
            }
            else
            {
                if (weechat_config_boolean (irc_config_look_display_ctcp_unknown))
                {
                    weechat_printf_date_tags (
                        irc_msgbuffer_get_target_buffer (
                            server, nick, NULL, "ctcp",
                            (channel) ? channel->buffer : NULL),
                        date,
                        irc_protocol_tags (command, "irc_ctcp", NULL, address),
                        _("%sUnknown CTCP requested by %s%s%s: %s%s%s%s%s"),
                        weechat_prefix ("network"),
                        irc_nick_color_for_msg (server, 0, NULL, nick),
                        nick,
                        IRC_COLOR_RESET,
                        IRC_COLOR_CHAT_CHANNEL,
                        arguments + 1,
                        (pos_args) ? IRC_COLOR_RESET : "",
                        (pos_args) ? " " : "",
                        (pos_args) ? pos_args : "");
                }
            }
        }

        (void) weechat_hook_signal_send ("irc_ctcp",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (pos_space)
            pos_space[0] = ' ';

        if (pos_end)
            pos_end[0] = '\01';

        arguments = (pos_end) ? pos_end + 1 : NULL;
    }
}


Fixed version (ground truth):
/*
 * irc-ctcp.c - IRC CTCP protocol
 *
 * Copyright (C) 2003-2017 Sébastien Helleu <flashcode@flashtux.org>
 *
 * This file is part of WeeChat, the extensible chat client.
 *
 * WeeChat 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 3 of the License, or
 * (at your option) any later version.
 *
 * WeeChat 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 WeeChat.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <sys/utsname.h>
#include <locale.h>

#include "../weechat-plugin.h"
#include "irc.h"
#include "irc-ctcp.h"
#include "irc-channel.h"
#include "irc-color.h"
#include "irc-config.h"
#include "irc-msgbuffer.h"
#include "irc-nick.h"
#include "irc-protocol.h"
#include "irc-server.h"


struct t_irc_ctcp_reply irc_ctcp_default_reply[] =
{ { "clientinfo", "$clientinfo" },
  { "finger",     "WeeChat $versiongit" },
  { "source",     "$download" },
  { "time",       "$time" },
  { "userinfo",   "$username ($realname)" },
  { "version",    "WeeChat $versiongit ($compilation)" },
  { NULL,         NULL },
};


/*
 * Gets default reply for a CTCP query.
 *
 * Returns NULL if CTCP is unknown.
 */

const char *
irc_ctcp_get_default_reply (const char *ctcp)
{
    int i;

    for (i = 0; irc_ctcp_default_reply[i].name; i++)
    {
        if (weechat_strcasecmp (irc_ctcp_default_reply[i].name, ctcp) == 0)
            return irc_ctcp_default_reply[i].reply;
    }

    /* unknown CTCP */
    return NULL;
}

/*
 * Gets reply for a CTCP query.
 */

const char *
irc_ctcp_get_reply (struct t_irc_server *server, const char *ctcp)
{
    struct t_config_option *ptr_option;
    char option_name[512];

    snprintf (option_name, sizeof (option_name), "%s.%s", server->name, ctcp);

    /* search for CTCP in configuration file, for server */
    ptr_option = weechat_config_search_option (irc_config_file,
                                               irc_config_section_ctcp,
                                               option_name);
    if (ptr_option)
        return weechat_config_string (ptr_option);

    /* search for CTCP in configuration file */
    ptr_option = weechat_config_search_option (irc_config_file,
                                               irc_config_section_ctcp,
                                               ctcp);
    if (ptr_option)
        return weechat_config_string (ptr_option);

    /*
     * no CTCP reply found in config, then return default reply, or NULL
     * for unknown CTCP
     */
    return irc_ctcp_get_default_reply (ctcp);
}

/*
 * Displays CTCP requested by a nick.
 */

void
irc_ctcp_display_request (struct t_irc_server *server,
                          time_t date,
                          const char *command,
                          struct t_irc_channel *channel,
                          const char *nick,
                          const char *address,
                          const char *ctcp,
                          const char *arguments,
                          const char *reply)
{
    /* CTCP blocked and user doesn't want to see message? then just return */
    if (reply && !reply[0]
        && !weechat_config_boolean (irc_config_look_display_ctcp_blocked))
        return;

    weechat_printf_date_tags (
        irc_msgbuffer_get_target_buffer (
            server, nick, NULL, "ctcp",
            (channel) ? channel->buffer : NULL),
        date,
        irc_protocol_tags (command, "irc_ctcp", NULL, address),
        _("%sCTCP requested by %s%s%s: %s%s%s%s%s%s"),
        weechat_prefix ("network"),
        irc_nick_color_for_msg (server, 0, NULL, nick),
        nick,
        IRC_COLOR_RESET,
        IRC_COLOR_CHAT_CHANNEL,
        ctcp,
        IRC_COLOR_RESET,
        (arguments) ? " " : "",
        (arguments) ? arguments : "",
        (reply && !reply[0]) ? _(" (blocked)") : "");
}

/*
 * Displays reply from a nick to a CTCP query.
 */

void
irc_ctcp_display_reply_from_nick (struct t_irc_server *server, time_t date,
                                  const char *command, const char *nick,
                                  const char *address, char *arguments)
{
    char *pos_end, *pos_space, *pos_args, *pos_usec;
    struct timeval tv;
    long sec1, usec1, sec2, usec2, difftime;

    while (arguments && arguments[0])
    {
        pos_end = strrchr (arguments + 1, '\01');
        if (pos_end)
            pos_end[0] = '\0';

        pos_space = strchr (arguments + 1, ' ');
        if (pos_space)
        {
            pos_space[0] = '\0';
            pos_args = pos_space + 1;
            while (pos_args[0] == ' ')
            {
                pos_args++;
            }
            if (strcmp (arguments + 1, "PING") == 0)
            {
                pos_usec = strchr (pos_args, ' ');
                if (pos_usec)
                {
                    pos_usec[0] = '\0';

                    gettimeofday (&tv, NULL);
                    sec1 = atol (pos_args);
                    usec1 = atol (pos_usec + 1);
                    sec2 = tv.tv_sec;
                    usec2 = tv.tv_usec;

                    difftime = ((sec2 * 1000000) + usec2) -
                        ((sec1 * 1000000) + usec1);
                    weechat_printf_date_tags (
                        irc_msgbuffer_get_target_buffer (
                            server, nick, NULL, "ctcp", NULL),
                        date,
                        irc_protocol_tags (command, "irc_ctcp", NULL, NULL),
                        /* TRANSLATORS: %.3fs is a float number + "s" ("seconds") */
                        _("%sCTCP reply from %s%s%s: %s%s%s %.3fs"),
                        weechat_prefix ("network"),
                        irc_nick_color_for_msg (server, 0, NULL, nick),
                        nick,
                        IRC_COLOR_RESET,
                        IRC_COLOR_CHAT_CHANNEL,
                        arguments + 1,
                        IRC_COLOR_RESET,
                        (float)difftime / 1000000.0);

                    pos_usec[0] = ' ';
                }
            }
            else
            {
                weechat_printf_date_tags (
                    irc_msgbuffer_get_target_buffer (
                        server, nick, NULL, "ctcp", NULL),
                    date,
                    irc_protocol_tags (command, "irc_ctcp", NULL, address),
                    _("%sCTCP reply from %s%s%s: %s%s%s%s%s"),
                    weechat_prefix ("network"),
                    irc_nick_color_for_msg (server, 0, NULL, nick),
                    nick,
                    IRC_COLOR_RESET,
                    IRC_COLOR_CHAT_CHANNEL,
                    arguments + 1,
                    IRC_COLOR_RESET,
                    " ",
                    pos_args);
            }
            pos_space[0] = ' ';
        }
        else
        {
            weechat_printf_date_tags (
                irc_msgbuffer_get_target_buffer (
                    server, nick, NULL, "ctcp", NULL),
                date,
                irc_protocol_tags (command, NULL, NULL, address),
                _("%sCTCP reply from %s%s%s: %s%s%s%s%s"),
                weechat_prefix ("network"),
                irc_nick_color_for_msg (server, 0, NULL, nick),
                nick,
                IRC_COLOR_RESET,
                IRC_COLOR_CHAT_CHANNEL,
                arguments + 1,
                "",
                "",
                "");
        }

        if (pos_end)
            pos_end[0] = '\01';

        arguments = (pos_end) ? pos_end + 1 : NULL;
    }
}

/*
 * Displays CTCP replied to a nick.
 */

void
irc_ctcp_reply_to_nick (struct t_irc_server *server,
                        const char *command,
                        struct t_irc_channel *channel,
                        const char *nick, const char *ctcp,
                        const char *arguments)
{
    struct t_hashtable *hashtable;
    int number;
    char hash_key[32];
    const char *str_args;
    char *str_args_color;

    hashtable = irc_server_sendf (
        server,
        IRC_SERVER_SEND_OUTQ_PRIO_LOW | IRC_SERVER_SEND_RETURN_HASHTABLE,
        NULL,
        "NOTICE %s :\01%s%s%s\01",
        nick, ctcp,
        (arguments) ? " " : "",
        (arguments) ? arguments : "");

    if (hashtable)
    {
        if (weechat_config_boolean (irc_config_look_display_ctcp_reply))
        {
            number = 1;
            while (1)
            {
                snprintf (hash_key, sizeof (hash_key), "args%d", number);
                str_args = weechat_hashtable_get (hashtable, hash_key);
                if (!str_args)
                    break;
                str_args_color = irc_color_decode (str_args, 1);
                if (!str_args_color)
                    break;
                weechat_printf_date_tags (
                    irc_msgbuffer_get_target_buffer (
                        server, nick, NULL, "ctcp",
                        (channel) ? channel->buffer : NULL),
                    0,
                    irc_protocol_tags (
                        command,
                        "irc_ctcp,irc_ctcp_reply,self_msg,notify_none,"
                        "no_highlight",
                        NULL, NULL),
                    _("%sCTCP reply to %s%s%s: %s%s%s%s%s"),
                    weechat_prefix ("network"),
                    irc_nick_color_for_msg (server, 0, NULL, nick),
                    nick,
                    IRC_COLOR_RESET,
                    IRC_COLOR_CHAT_CHANNEL,
                    ctcp,
                    (str_args_color[0]) ? IRC_COLOR_RESET : "",
                    (str_args_color[0]) ? " " : "",
                    str_args_color);
                free (str_args_color);
                number++;
            }
        }
        weechat_hashtable_free (hashtable);
    }
}

/*
 * Replaces variables in CTCP format.
 *
 * Note: result must be freed after use.
 */

char *
irc_ctcp_replace_variables (struct t_irc_server *server, const char *format)
{
    char *res, *temp, *username, *realname;
    const char *info;
    time_t now;
    struct tm *local_time;
    char buf[1024];
    struct utsname *buf_uname;

    /*
     * $clientinfo: supported CTCP, example:
     *   ACTION DCC CLIENTINFO FINGER PING SOURCE TIME USERINFO VERSION
     */
    temp = weechat_string_replace (
        format, "$clientinfo",
        "ACTION DCC CLIENTINFO FINGER PING SOURCE TIME USERINFO VERSION");
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $git: git version (output of "git describe" for a development version
     * only, empty string if unknown), example:
     *   v0.3.9-104-g7eb5cc4
     */
    info = weechat_info_get ("version_git", "");
    temp = weechat_string_replace (res, "$git", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $versiongit: WeeChat version + git version (if known), examples:
     *   0.3.9
     *   0.4.0-dev
     *   0.4.0-dev (git: v0.3.9-104-g7eb5cc4)
     */
    info = weechat_info_get ("version_git", "");
    snprintf (buf, sizeof (buf), "%s%s%s%s",
              weechat_info_get ("version", ""),
              (info && info[0]) ? " (git: " : "",
              (info && info[0]) ? info : "",
              (info && info[0]) ? ")" : "");
    temp = weechat_string_replace (res, "$versiongit", buf);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $version: WeeChat version, examples:
     *   0.3.9
     *   0.4.0-dev
     */
    info = weechat_info_get ("version", "");
    temp = weechat_string_replace (res, "$version", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $compilation: compilation date, example:
     *   Dec 16 2012
     */
    info = weechat_info_get ("date", "");
    temp = weechat_string_replace (res, "$compilation", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $osinfo: info about OS, example:
     *   Linux 2.6.32-5-amd64 / x86_64
     */
    buf_uname = (struct utsname *)malloc (sizeof (struct utsname));
    if (buf_uname)
    {
        if (uname (buf_uname) >= 0)
        {
            snprintf (buf, sizeof (buf), "%s %s / %s",
                      buf_uname->sysname, buf_uname->release,
                      buf_uname->machine);
            temp = weechat_string_replace (res, "$osinfo", buf);
            free (res);
            if (!temp)
            {
                free (buf_uname);
                return NULL;
            }
            res = temp;
        }
        free (buf_uname);
    }

    /*
     * $site: WeeChat web site, example:
     *   https://weechat.org/
     */
    info = weechat_info_get ("weechat_site", "");
    temp = weechat_string_replace (res, "$site", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $download: WeeChat download page, example:
     *   https://weechat.org/download
     */
    info = weechat_info_get ("weechat_site_download", "");
    temp = weechat_string_replace (res, "$download", info);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $time: local date/time of user, example:
     *   Sun, 16 Dec 2012 10:40:48 +0100
     */
    now = time (NULL);
    local_time = localtime (&now);
    setlocale (LC_ALL, "C");
    strftime (buf, sizeof (buf),
              weechat_config_string (irc_config_look_ctcp_time_format),
              local_time);
    setlocale (LC_ALL, "");
    temp = weechat_string_replace (res, "$time", buf);
    free (res);
    if (!temp)
        return NULL;
    res = temp;

    /*
     * $username: user name, example:
     *   name
     */
    username = weechat_string_eval_expression (
        IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_USERNAME),
        NULL, NULL, NULL);
    if (username)
    {
        temp = weechat_string_replace (res, "$username", username);
        free (res);
        if (!temp)
            return NULL;
        res = temp;
        free (username);
    }

    /*
     * $realname: real name, example:
     *   John doe
     */
    realname = weechat_string_eval_expression (
        IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_REALNAME),
        NULL, NULL, NULL);
    if (realname)
    {
        temp = weechat_string_replace (res, "$realname", realname);
        free (res);
        if (!temp)
            return NULL;
        res = temp;
        free (realname);
    }

    /* return result */
    return res;
}

/*
 * Returns filename for DCC, without double quotes.
 *
 * Note: result must be freed after use.
 */

char *
irc_ctcp_dcc_filename_without_quotes (const char *filename)
{
    int length;

    length = strlen (filename);
    if (length > 1)
    {
        if ((filename[0] == '\"') && (filename[length - 1] == '\"'))
            return weechat_strndup (filename + 1, length - 2);
    }
    return strdup (filename);
}

/*
 * Parses CTCP DCC.
 */

void
irc_ctcp_recv_dcc (struct t_irc_server *server, const char *nick,
                   const char *arguments, char *message)
{
    char *dcc_args, *pos, *pos_file, *pos_addr, *pos_port, *pos_size;
    char *pos_start_resume, *filename;
    struct t_infolist *infolist;
    struct t_infolist_item *item;
    char charset_modifier[256];

    if (!arguments || !arguments[0])
        return;

    if (strncmp (arguments, "SEND ", 5) == 0)
    {
        arguments += 5;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* DCC filename */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* look for file size */
        pos_size = strrchr (pos_file, ' ');
        if (!pos_size)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }

        pos = pos_size;
        pos_size++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC port */
        pos_port = strrchr (pos_file, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }

        pos = pos_port;
        pos_port++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC IP address */
        pos_addr = strrchr (pos_file, ' ');
        if (!pos_addr)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }

        pos = pos_addr;
        pos_addr++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* remove double quotes around filename */
        filename = irc_ctcp_dcc_filename_without_quotes (pos_file);

        /* add DCC file via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "file_recv");
                weechat_infolist_new_var_string (item, "protocol_string", "dcc");
                weechat_infolist_new_var_string (item, "remote_nick", nick);
                weechat_infolist_new_var_string (item, "local_nick", server->nick);
                weechat_infolist_new_var_string (item, "filename",
                                                 (filename) ? filename : pos_file);
                weechat_infolist_new_var_string (item, "size", pos_size);
                weechat_infolist_new_var_string (item, "proxy",
                                                 IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_PROXY));
                weechat_infolist_new_var_string (item, "remote_address", pos_addr);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                (void) weechat_hook_signal_send ("xfer_add",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (filename)
            free (filename);

        free (dcc_args);
    }
    else if (strncmp (arguments, "RESUME ", 7) == 0)
    {
        arguments += 7;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* DCC filename */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* look for resume start position */
        pos_start_resume = strrchr (pos_file, ' ');
        if (!pos_start_resume)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_start_resume;
        pos_start_resume++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC port */
        pos_port = strrchr (pos_file, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_port;
        pos_port++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* remove double quotes around filename */
        filename = irc_ctcp_dcc_filename_without_quotes (pos_file);

        /* accept resume via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "file_recv");
                weechat_infolist_new_var_string (item, "filename",
                                                 (filename) ? filename : pos_file);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                weechat_infolist_new_var_string (item, "start_resume", pos_start_resume);
                (void) weechat_hook_signal_send ("xfer_accept_resume",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (filename)
            free (filename);

        free (dcc_args);
    }
    else if (strncmp (arguments, "ACCEPT ", 7) == 0)
    {
        arguments += 7;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* DCC filename */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* look for resume start position */
        pos_start_resume = strrchr (pos_file, ' ');
        if (!pos_start_resume)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_start_resume;
        pos_start_resume++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* look for DCC port */
        pos_port = strrchr (pos_file, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos = pos_port;
        pos_port++;
        while (pos[0] == ' ')
        {
            pos--;
        }
        pos[1] = '\0';

        /* remove double quotes around filename */
        filename = irc_ctcp_dcc_filename_without_quotes (pos_file);

        /* resume file via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "file_recv");
                weechat_infolist_new_var_string (item, "filename",
                                                 (filename) ? filename : pos_file);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                weechat_infolist_new_var_string (item, "start_resume", pos_start_resume);
                (void) weechat_hook_signal_send ("xfer_start_resume",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (filename)
            free (filename);

        free (dcc_args);
    }
    else if (strncmp (arguments, "CHAT ", 5) == 0)
    {
        arguments += 5;
        while (arguments[0] == ' ')
        {
            arguments++;
        }
        dcc_args = strdup (arguments);

        if (!dcc_args)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: not enough memory for \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            return;
        }

        /* CHAT type */
        pos_file = dcc_args;
        while (pos_file[0] == ' ')
        {
            pos_file++;
        }

        /* DCC IP address */
        pos_addr = strchr (pos_file, ' ');
        if (!pos_addr)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos_addr[0] = '\0';
        pos_addr++;
        while (pos_addr[0] == ' ')
        {
            pos_addr++;
        }

        /* look for DCC port */
        pos_port = strchr (pos_addr, ' ');
        if (!pos_port)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: cannot parse \"%s\" command"),
                weechat_prefix ("error"), IRC_PLUGIN_NAME, "privmsg");
            free (dcc_args);
            return;
        }
        pos_port[0] = '\0';
        pos_port++;
        while (pos_port[0] == ' ')
        {
            pos_port++;
        }

        if (weechat_strcasecmp (pos_file, "chat") != 0)
        {
            weechat_printf (
                server->buffer,
                _("%s%s: unknown DCC CHAT type received from %s%s%s: \"%s\""),
                weechat_prefix ("error"),
                IRC_PLUGIN_NAME,
                irc_nick_color_for_msg (server, 0, NULL, nick),
                nick,
                IRC_COLOR_RESET,
                pos_file);
            free (dcc_args);
            return;
        }

        /* add DCC chat via xfer plugin */
        infolist = weechat_infolist_new ();
        if (infolist)
        {
            item = weechat_infolist_new_item (infolist);
            if (item)
            {
                weechat_infolist_new_var_string (item, "plugin_name", weechat_plugin->name);
                weechat_infolist_new_var_string (item, "plugin_id", server->name);
                weechat_infolist_new_var_string (item, "type_string", "chat_recv");
                weechat_infolist_new_var_string (item, "remote_nick", nick);
                weechat_infolist_new_var_string (item, "local_nick", server->nick);
                snprintf (charset_modifier, sizeof (charset_modifier),
                          "irc.%s.%s", server->name, nick);
                weechat_infolist_new_var_string (item, "charset_modifier", charset_modifier);
                weechat_infolist_new_var_string (item, "proxy",
                                                 IRC_SERVER_OPTION_STRING(server, IRC_SERVER_OPTION_PROXY));
                weechat_infolist_new_var_string (item, "remote_address", pos_addr);
                weechat_infolist_new_var_integer (item, "port", atoi (pos_port));
                (void) weechat_hook_signal_send ("xfer_add",
                                                 WEECHAT_HOOK_SIGNAL_POINTER,
                                                 infolist);
            }
            weechat_infolist_free (infolist);
        }

        (void) weechat_hook_signal_send ("irc_dcc",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        free (dcc_args);
    }
}

/*
 * Receives a CTCP and if needed replies to query.
 */

void
irc_ctcp_recv (struct t_irc_server *server, time_t date, const char *command,
               struct t_irc_channel *channel, const char *address,
               const char *nick, const char *remote_nick, char *arguments,
               char *message)
{
    char *pos_end, *pos_space, *pos_args;
    const char *reply;
    char *decoded_reply;
    struct t_irc_channel *ptr_channel;
    struct t_irc_nick *ptr_nick;
    int nick_is_me;

    while (arguments && arguments[0])
    {
        pos_end = strrchr (arguments + 1, '\01');
        if (pos_end)
            pos_end[0] = '\0';

        pos_args = NULL;
        pos_space = strchr (arguments + 1, ' ');
        if (pos_space)
        {
            pos_space[0] = '\0';
            pos_args = pos_space + 1;
            while (pos_args[0] == ' ')
            {
                pos_args++;
            }
        }

        /* CTCP ACTION */
        if (strcmp (arguments + 1, "ACTION") == 0)
        {
            nick_is_me = (irc_server_strcasecmp (server, server->nick, nick) == 0);
            if (channel)
            {
                ptr_nick = irc_nick_search (server, channel, nick);
                irc_channel_nick_speaking_add (channel,
                                               nick,
                                               (pos_args) ?
                                               weechat_string_has_highlight (pos_args,
                                                                             server->nick) : 0);
                irc_channel_nick_speaking_time_remove_old (channel);
                irc_channel_nick_speaking_time_add (server, channel, nick,
                                                    time (NULL));
                weechat_printf_date_tags (
                    channel->buffer,
                    date,
                    irc_protocol_tags (
                        command,
                        (nick_is_me) ?
                        "irc_action,self_msg,notify_none,no_highlight" :
                        "irc_action,notify_message",
                        nick, address),
                    "%s%s%s%s%s%s%s",
                    weechat_prefix ("action"),
                    irc_nick_mode_for_display (server, ptr_nick, 0),
                    (ptr_nick) ? ptr_nick->color : ((nick) ? irc_nick_find_color (nick) : IRC_COLOR_CHAT_NICK),
                    nick,
                    (pos_args) ? IRC_COLOR_RESET : "",
                    (pos_args) ? " " : "",
                    (pos_args) ? pos_args : "");
            }
            else
            {
                ptr_channel = irc_channel_search (server, remote_nick);
                if (!ptr_channel)
                {
                    ptr_channel = irc_channel_new (server,
                                                   IRC_CHANNEL_TYPE_PRIVATE,
                                                   remote_nick, 0, 0);
                    if (!ptr_channel)
                    {
                        weechat_printf (
                            server->buffer,
                            _("%s%s: cannot create new private buffer \"%s\""),
                            weechat_prefix ("error"), IRC_PLUGIN_NAME,
                            remote_nick);
                    }
                }
                if (ptr_channel)
                {
                    if (!ptr_channel->topic)
                        irc_channel_set_topic (ptr_channel, address);

                    weechat_printf_date_tags (
                        ptr_channel->buffer,
                        date,
                        irc_protocol_tags (
                            command,
                            (nick_is_me) ?
                            "irc_action,self_msg,notify_none,no_highlight" :
                            "irc_action,notify_private",
                            nick, address),
                        "%s%s%s%s%s%s",
                        weechat_prefix ("action"),
                        (nick_is_me) ?
                        IRC_COLOR_CHAT_NICK_SELF : irc_nick_color_for_pv (ptr_channel, nick),
                        nick,
                        (pos_args) ? IRC_COLOR_RESET : "",
                        (pos_args) ? " " : "",
                        (pos_args) ? pos_args : "");
                    (void) weechat_hook_signal_send ("irc_pv",
                                                     WEECHAT_HOOK_SIGNAL_STRING,
                                                     message);
                }
            }
        }
        /* CTCP PING */
        else if (strcmp (arguments + 1, "PING") == 0)
        {
            reply = irc_ctcp_get_reply (server, arguments + 1);
            irc_ctcp_display_request (server, date, command, channel, nick,
                                      address, arguments + 1, pos_args, reply);
            if (!reply || reply[0])
            {
                irc_ctcp_reply_to_nick (server, command, channel, nick,
                                        arguments + 1, pos_args);
            }
        }
        /* CTCP DCC */
        else if (strcmp (arguments + 1, "DCC") == 0)
        {
            irc_ctcp_recv_dcc (server, nick, pos_args, message);
        }
        /* other CTCP */
        else
        {
            reply = irc_ctcp_get_reply (server, arguments + 1);
            if (reply)
            {
                irc_ctcp_display_request (server, date, command, channel, nick,
                                          address, arguments + 1, pos_args,
                                          reply);

                if (reply[0])
                {
                    decoded_reply = irc_ctcp_replace_variables (server, reply);
                    if (decoded_reply)
                    {
                        irc_ctcp_reply_to_nick (server, command, channel, nick,
                                                arguments + 1, decoded_reply);
                        free (decoded_reply);
                    }
                }
            }
            else
            {
                if (weechat_config_boolean (irc_config_look_display_ctcp_unknown))
                {
                    weechat_printf_date_tags (
                        irc_msgbuffer_get_target_buffer (
                            server, nick, NULL, "ctcp",
                            (channel) ? channel->buffer : NULL),
                        date,
                        irc_protocol_tags (command, "irc_ctcp", NULL, address),
                        _("%sUnknown CTCP requested by %s%s%s: %s%s%s%s%s"),
                        weechat_prefix ("network"),
                        irc_nick_color_for_msg (server, 0, NULL, nick),
                        nick,
                        IRC_COLOR_RESET,
                        IRC_COLOR_CHAT_CHANNEL,
                        arguments + 1,
                        (pos_args) ? IRC_COLOR_RESET : "",
                        (pos_args) ? " " : "",
                        (pos_args) ? pos_args : "");
                }
            }
        }

        (void) weechat_hook_signal_send ("irc_ctcp",
                                         WEECHAT_HOOK_SIGNAL_STRING,
                                         message);

        if (pos_space)
            pos_space[0] = ' ';

        if (pos_end)
            pos_end[0] = '\01';

        arguments = (pos_end) ? pos_end + 1 : NULL;
    }
}