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/*
dcc-server.c : irssi
Copyright (C) 2003 Mark Trumbull
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "module.h"
#include "signals.h"
#include "commands.h"
#include "network.h"
#include "net-sendbuffer.h"
#include "line-split.h"
#include "misc.h"
#include "irc-servers.h"
#include "dcc-chat.h"
#include "dcc-get.h"
#include "dcc-server.h"
void sig_dccget_connected(GET_DCC_REC *dcc);
GET_DCC_REC *dcc_get_create(IRC_SERVER_REC *server, CHAT_DCC_REC *chat,
const char *nick, const char *arg);
void dcc_chat_input(CHAT_DCC_REC *dcc);
CHAT_DCC_REC *dcc_chat_create(IRC_SERVER_REC *server, CHAT_DCC_REC *chat,
const char *nick, const char *arg);
static void sig_dcc_destroyed(SERVER_DCC_REC *dcc)
{
if (!IS_DCC_SERVER(dcc))
return;
if (dcc->sendbuf != NULL)
net_sendbuffer_destroy(dcc->sendbuf, FALSE);
line_split_free(dcc->readbuf);
}
/* Start listening for incoming connections */
static GIOChannel *dcc_listen_port(GIOChannel *iface, IPADDR *ip, int port)
{
if (net_getsockname(iface, ip, NULL) == -1)
return NULL;
if (IPADDR_IS_V6(ip))
return net_listen(NULL, &port);
else
return net_listen(&ip4_any, &port);
}
/* input function: DCC SERVER received some data.. */
static void dcc_server_input(SERVER_DCC_REC *dcc)
{
char tmpbuf[512], *str;
int recvlen, ret;
g_return_if_fail(IS_DCC_SERVER(dcc));
do {
recvlen = net_receive(dcc->handle, tmpbuf, sizeof(tmpbuf));
ret = line_split(tmpbuf, recvlen, &str, &dcc->readbuf);
if (ret == -1) {
/* connection lost */
dcc_close(DCC(dcc));
break;
}
if (ret > 0) {
dcc->transfd += ret;
signal_emit("dcc server message", 2, dcc, str);
}
if (dcc->connection_established) {
/* We set handle to NULL first because the new (chat/get) is using the same */
/* handle and we don't want dcc_close to disconnect it.*/
dcc->handle = NULL;
dcc_close(DCC(dcc));
break;
}
} while (ret > 0);
}
static void dcc_server_update_flags(SERVER_DCC_REC *dcc, const char *flags)
{
g_return_if_fail(dcc != NULL);
g_return_if_fail(IS_DCC_SERVER(dcc));
if (*flags == '+' || *flags == '-') {
const char *ptr = flags + 1;
unsigned int value = (*flags == '+') ? 1 : 0;
while (*ptr) {
if (*ptr == 's' || *ptr == 'S') { dcc->accept_send = value; }
else if (*ptr == 'c' || *ptr == 'C') { dcc->accept_chat = value; }
else if (*ptr == 'f' || *ptr == 'F') { dcc->accept_fserve = value; }
ptr++;
}
}
}
/* Initialize DCC record */
static void dcc_init_server_rec(SERVER_DCC_REC *dcc, IRC_SERVER_REC *server,
const char *mynick, const char *servertag)
{
g_return_if_fail(dcc != NULL);
g_return_if_fail(IS_DCC_SERVER(dcc));
MODULE_DATA_INIT(dcc);
dcc->created = time(NULL);
dcc->chat = NULL;
dcc->arg = NULL;
dcc->nick = NULL;
dcc->tagconn = dcc->tagread = dcc->tagwrite = -1;
dcc->server = server;
dcc->mynick = g_strdup(mynick);
dcc->servertag = g_strdup(servertag);
dcc_conns = g_slist_append(dcc_conns, dcc);
signal_emit("dcc created", 1, dcc);
}
static SERVER_DCC_REC *dcc_server_create(IRC_SERVER_REC *server, const char *flags)
{
SERVER_DCC_REC *dcc;
dcc = g_new0(SERVER_DCC_REC, 1);
dcc->orig_type = dcc->type = DCC_SERVER_TYPE;
dcc_server_update_flags(dcc, flags);
dcc_init_server_rec(dcc, server, dcc->mynick, dcc->servertag);
return dcc;
}
static SERVER_DCC_REC *dcc_server_clone(SERVER_DCC_REC *dcc)
{
SERVER_DCC_REC *newdcc;
g_return_val_if_fail(IS_DCC_SERVER(dcc), NULL);
newdcc = g_new0(SERVER_DCC_REC, 1);
newdcc->orig_type = newdcc->type = DCC_SERVER_TYPE;
newdcc->accept_send = dcc->accept_send;
newdcc->accept_chat = dcc->accept_chat;
newdcc->accept_fserve = dcc->accept_fserve;
dcc_init_server_rec(newdcc, dcc->server, dcc->mynick, dcc->servertag);
return newdcc;
}
/* input function: DCC SERVER - someone tried to connect to our socket */
static void dcc_server_listen(SERVER_DCC_REC *dcc)
{
SERVER_DCC_REC *newdcc;
IPADDR ip;
GIOChannel *handle;
int port;
g_return_if_fail(IS_DCC_SERVER(dcc));
/* accept connection */
handle = net_accept(dcc->handle, &ip, &port);
if (handle == NULL)
return;
/* Create a new DCC SERVER to handle this connection */
newdcc = dcc_server_clone(dcc);
newdcc->starttime = time(NULL);
newdcc->handle = handle;
newdcc->sendbuf = net_sendbuffer_create(handle, 0);
memcpy(&newdcc->addr, &ip, sizeof(IPADDR));
net_ip2host(&newdcc->addr, newdcc->addrstr);
newdcc->port = port;
newdcc->tagread = g_input_add(handle, G_INPUT_READ,
(GInputFunction) dcc_server_input, newdcc);
signal_emit("dcc connected", 1, newdcc);
}
/* DCC SERVER: text received */
static void dcc_server_msg(SERVER_DCC_REC *dcc, const char *msg)
{
g_return_if_fail(IS_DCC_SERVER(dcc));
g_return_if_fail(msg != NULL);
/* Check for CHAT protocol */
if (g_strncasecmp(msg, "100 ", 4) == 0) {
msg += 4;
/* Check if this server is accepting chat requests.*/
if (dcc->accept_chat) {
/* Connect and start DCC Chat */
char *str;
CHAT_DCC_REC *dccchat = dcc_chat_create(dcc->server, NULL, msg, "chat");
dccchat->starttime = time(NULL);
dccchat->handle = dcc->handle;
dccchat->sendbuf = net_sendbuffer_create(dccchat->handle, 0);
memcpy(&dccchat->addr, &dcc->addr, sizeof(IPADDR));
net_ip2host(&dccchat->addr, dccchat->addrstr);
dccchat->port = dcc->port;
dccchat->tagread = g_input_add(dccchat->handle, G_INPUT_READ,
(GInputFunction) dcc_chat_input, dccchat);
dcc->connection_established = 1;
signal_emit("dcc connected", 1, dccchat);
str = g_strdup_printf("101 %s\n",
(dccchat->server) ? dccchat->server->nick : "??");
net_sendbuffer_send(dccchat->sendbuf, str, strlen(str));
g_free(str);
}
}
/* Check for FSERVE protocol */
if (g_strncasecmp(msg, "110 ", 4) == 0) {
msg += 4;
/* Check if this server is accepting fserve requests.*/
if (dcc->accept_fserve) {
/* TODO - Connect and start DCC Fserve */
}
}
/* Check for SEND protocol */
if (g_strncasecmp(msg, "120 ", 4) == 0) {
msg += 4;
/* Check if this server is accepting send requests.*/
if (dcc->accept_send) {
/* Connect and start DCC Send */
GET_DCC_REC *dccget;
char **params, *fname, *nick;
int paramcount, len, quoted = FALSE;
uoff_t size;
/* 120 clientnickname filesize filename */
params = g_strsplit(msg, " ", -1);
paramcount = strarray_length(params);
if (paramcount < 3) {
g_strfreev(params);
signal_stop();
return;
}
nick = params[0];
size = str_to_uofft(params[1]);
fname = g_strjoinv(" ", ¶ms[2]);
len = strlen(fname);
if (len > 1 && *fname == '"' && fname[len-1] == '"') {
/* "file name" - MIRC sends filenames with spaces like this */
fname[len-1] = '\0';
g_memmove(fname, fname+1, len);
quoted = TRUE;
}
dccget = dcc_get_create(dcc->server, NULL, nick, fname);
dccget->handle = dcc->handle;
dccget->target = g_strdup(dcc->server ? dcc->server->nick : "??");
memcpy(&dccget->addr, &dcc->addr, sizeof(dcc->addr));
if (dccget->addr.family == AF_INET) {
net_ip2host(&dccget->addr, dccget->addrstr);
} else {
/* with IPv6, show it to us as it was sent */
memcpy(dccget->addrstr, dcc->addrstr, sizeof(dccget->addrstr));
}
dccget->port = dcc->port;
dccget->size = size;
dccget->file_quoted = quoted;
dccget->from_dccserver = 1;
dcc->connection_established = 1;
signal_emit("dcc request", 2, dccget, dccget->addrstr);
g_strfreev(params);
g_free(fname);
}
}
signal_stop();
}
SERVER_DCC_REC *dcc_server_find_port(const char *port_str)
{
GSList *tmp;
unsigned int port = 0;
g_return_val_if_fail(port_str != NULL, NULL);
port = atoi(port_str);
for (tmp = dcc_conns; tmp != NULL; tmp = tmp->next) {
SERVER_DCC_REC *dcc = tmp->data;
if (IS_DCC_SERVER(dcc) && dcc->port == port)
return dcc;
}
return NULL;
}
/* SYNTAX: DCC SERVER [+|-scf] [port] */
static void cmd_dcc_server(const char *data, IRC_SERVER_REC *server)
{
void *free_arg;
GIOChannel *handle;
SERVER_DCC_REC *dcc;
IPADDR own_ip;
char *flags, *port;
g_return_if_fail(data != NULL);
if (!cmd_get_params(data, &free_arg, 2, &flags, &port))
return;
dcc = dcc_server_find_port(port);
if (dcc != NULL) {
/* Server is already running, update it */
dcc_server_update_flags(dcc, flags);
cmd_params_free(free_arg);
return;
}
/* start listening */
if (!IS_IRC_SERVER(server) || !server->connected) {
cmd_param_error(CMDERR_NOT_CONNECTED);
}
handle = dcc_listen_port(net_sendbuffer_handle(server->handle),
&own_ip, atoi(port));
if (handle == NULL) {
cmd_param_error(CMDERR_ERRNO);
}
dcc = dcc_server_create(server, flags);
dcc->handle = handle;
dcc->port = atoi(port);
dcc->tagconn = g_input_add(dcc->handle, G_INPUT_READ,
(GInputFunction) dcc_server_listen, dcc);
signal_emit("dcc server started", 1, dcc);
cmd_params_free(free_arg);
}
/* DCC CLOSE SERVER <port> */
static void cmd_dcc_close(char *data, SERVER_REC *server)
{
GSList *tmp, *next;
char *port_str;
void *free_arg;
int found, port;
g_return_if_fail(data != NULL);
if (g_strncasecmp(data, "SERVER ", 7) != 0 ||
!cmd_get_params(data, &free_arg, 2, NULL, &port_str)) {
return;
}
if (*port_str == '\0') {
cmd_param_error(CMDERR_NOT_ENOUGH_PARAMS);
}
port = atoi(port_str);
found = FALSE;
for (tmp = dcc_conns; tmp != NULL; tmp = next) {
SERVER_DCC_REC *dcc = tmp->data;
next = tmp->next;
if (IS_DCC_SERVER(dcc) && dcc->port == port) {
found = TRUE;
dcc_close(DCC(dcc));
}
}
if (found) {
signal_stop();
}
cmd_params_free(free_arg);
}
void dcc_server_init(void)
{
dcc_register_type("SERVER");
command_bind("dcc server", NULL, (SIGNAL_FUNC) cmd_dcc_server);
command_bind("dcc close", NULL, (SIGNAL_FUNC) cmd_dcc_close);
signal_add("dcc destroyed", (SIGNAL_FUNC) sig_dcc_destroyed);
signal_add_first("dcc server message", (SIGNAL_FUNC) dcc_server_msg);
}
void dcc_server_deinit(void)
{
dcc_unregister_type("SERVER");
command_unbind("dcc server", (SIGNAL_FUNC) cmd_dcc_server);
command_unbind("dcc close", (SIGNAL_FUNC) cmd_dcc_close);
signal_remove("dcc destroyed", (SIGNAL_FUNC) sig_dcc_destroyed);
signal_remove("dcc server message", (SIGNAL_FUNC) dcc_server_msg);
}
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