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/*
dcc-get.c : irssi
Copyright (C) 1999-2001 Timo Sirainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "module.h"
#include "signals.h"
#include "commands.h"
#include "network.h"
#include "misc.h"
#include "settings.h"
#include "irc-servers.h"
#include "dcc-get.h"
static int dcc_file_create_mode;
static GET_DCC_REC *dcc_get_create(IRC_SERVER_REC *server, CHAT_DCC_REC *chat,
const char *nick, const char *arg)
{
GET_DCC_REC *dcc;
dcc = g_new0(GET_DCC_REC, 1);
dcc->orig_type = module_get_uniq_id_str("DCC", "SEND");
dcc->type = module_get_uniq_id_str("DCC", "GET");
dcc->fhandle = -1;
dcc_init_rec(DCC(dcc), server, chat, nick, arg);
return dcc;
}
static void sig_dcc_destroyed(GET_DCC_REC *dcc)
{
if (!IS_DCC_GET(dcc)) return;
g_free_not_null(dcc->file);
if (dcc->fhandle != -1) close(dcc->fhandle);
}
char *dcc_get_download_path(const char *fname)
{
char *str, *downpath;
downpath = convert_home(settings_get_str("dcc_download_path"));
str = g_strconcat(downpath, G_DIR_SEPARATOR_S, g_basename(fname), NULL);
g_free(downpath);
return str;
}
static char *dcc_get_rename_file(const char *fname)
{
GString *newname;
struct stat statbuf;
char *ret;
int num;
newname = g_string_new(NULL);
num = 1;
do {
g_string_sprintf(newname, "%s.%d", fname, num);
num++;
} while (stat(newname->str, &statbuf) == 0);
ret = newname->str;
g_string_free(newname, FALSE);
return ret;
}
static void sig_dccget_send(GET_DCC_REC *dcc);
void dcc_get_send_received(GET_DCC_REC *dcc)
{
guint32 recd;
recd = (guint32) htonl(dcc->transfd);
memcpy(dcc->count_buf, &recd, 4);
dcc->count_pos =
net_transmit(dcc->handle, dcc->count_buf+dcc->count_pos,
4-dcc->count_pos);
if (dcc->count_pos == 4) dcc->count_pos = 0;
/* count_pos might be -1 here. if this happens, the
count_buf should be re-sent.. also, if it's 1, 2 or 3, the
last 1-3 bytes should be sent later. these happen probably
never, but I just want to do it right.. :) */
if (dcc->tagwrite == -1) {
dcc->tagwrite = g_input_add(dcc->handle, G_INPUT_WRITE,
(GInputFunction) sig_dccget_send,
dcc);
}
}
/* input function: DCC GET is free to send data */
static void sig_dccget_send(GET_DCC_REC *dcc)
{
guint32 recd;
int ret;
if (dcc->count_pos != 0) {
ret = net_transmit(dcc->handle, dcc->count_buf+dcc->count_pos,
4-dcc->count_pos);
if (dcc->count_pos <= 0)
dcc->count_pos = ret;
else if (ret > 0)
dcc->count_pos += ret;
if (dcc->count_pos == 4) dcc->count_pos = 0;
}
if (dcc->count_pos == 0) {
g_source_remove(dcc->tagwrite);
dcc->tagwrite = -1;
}
memcpy(&recd, dcc->count_buf, 4);
if (recd != (guint32) htonl(dcc->transfd))
dcc_get_send_received(dcc);
}
/* input function: DCC GET received data */
static void sig_dccget_receive(GET_DCC_REC *dcc)
{
char buffer[512];
int ret;
for (;;) {
ret = net_receive(dcc->handle, buffer, sizeof(buffer));
if (ret == 0) break;
if (ret < 0) {
/* socket closed - transmit complete,
or other side died.. */
dcc_close(DCC(dcc));
return;
}
if (write(dcc->fhandle, buffer, ret) != ret) {
/* most probably out of disk space */
signal_emit("dcc error write", 2,
dcc, g_strerror(errno));
dcc_close(DCC(dcc));
return;
}
dcc->transfd += ret;
}
/* send number of total bytes received */
if (dcc->count_pos <= 0)
dcc_get_send_received(dcc);
signal_emit("dcc transfer update", 1, dcc);
}
/* callback: net_connect() finished for DCC GET */
static void sig_dccget_connected(GET_DCC_REC *dcc)
{
struct stat statbuf;
char *fname, *tempfname;
int temphandle, old_umask;
if (net_geterror(dcc->handle) != 0) {
/* error connecting */
signal_emit("dcc error connect", 1, dcc);
dcc_destroy(DCC(dcc));
return;
}
g_source_remove(dcc->tagconn);
dcc->tagconn = -1;
g_free_not_null(dcc->file);
dcc->file = dcc_get_download_path(dcc->arg);
/* if some plugin wants to change the file name/path here.. */
signal_emit("dcc get receive", 1, dcc);
if (stat(dcc->file, &statbuf) == 0 &&
dcc->get_type == DCC_GET_RENAME) {
/* file exists, rename.. */
fname = dcc_get_rename_file(dcc->file);
g_free(dcc->file);
dcc->file = fname;
}
if (dcc->get_type != DCC_GET_RESUME) {
/* we want to overwrite the file, remove it here.
if it gets created after this, we'll fail. */
unlink(dcc->file);
/* just to make sure we won't run into race conditions
if download_path is in some global temp directory */
tempfname = g_strconcat(dcc->file, ".XXXXXX", NULL);
old_umask = umask(066);
temphandle = mkstemp(tempfname);
umask(old_umask);
dcc->fhandle = -1;
if (link(tempfname, dcc->file) == 0) {
/* ok, we're the file owner now */
dcc->fhandle = open(dcc->file, O_WRONLY | O_TRUNC | O_CREAT,
dcc_file_create_mode);
}
/* close/remove the temp file */
close(temphandle);
unlink(tempfname);
g_free(tempfname);
if (dcc->fhandle == -1) {
signal_emit("dcc error file create", 2,
dcc, dcc->file);
dcc_destroy(DCC(dcc));
return;
}
}
dcc->starttime = time(NULL);
dcc->tagread = g_input_add(dcc->handle, G_INPUT_READ,
(GInputFunction) sig_dccget_receive, dcc);
signal_emit("dcc connected", 1, dcc);
}
void dcc_get_connect(GET_DCC_REC *dcc)
{
if (dcc->get_type == DCC_GET_DEFAULT) {
dcc->get_type = settings_get_bool("dcc_autorename") ?
DCC_GET_RENAME : DCC_GET_OVERWRITE;
}
dcc->handle = dcc_connect_ip(&dcc->addr, dcc->port);
if (dcc->handle != NULL) {
dcc->tagconn =
g_input_add(dcc->handle,
G_INPUT_WRITE | G_INPUT_READ,
(GInputFunction) sig_dccget_connected,
dcc);
} else {
/* error connecting */
signal_emit("dcc error connect", 1, dcc);
dcc_destroy(DCC(dcc));
}
}
#define get_params_match(params, pos) \
((is_numeric(params[pos], '\0') || is_ipv6_address(params[pos])) && \
is_numeric(params[(pos)+1], '\0') && atol(params[(pos)+1]) < 65536 && \
is_numeric(params[(pos)+2], '\0'))
/* Return number of parameters in `params' that belong to file name.
Normally it's paramcount-3, but I don't think anything forbids of
adding some extension where there could be more parameters after
file size.
MIRC sends filenames with spaces quoted ("file name"), but I'd rather
not trust that entirely either. At least some clients that don't really
understand the problem with spaces in file names sends the file name
without any quotes. */
int get_file_params_count(char **params, int paramcount)
{
int pos, best;
if (*params[0] == '"') {
/* quoted file name? */
for (pos = 0; pos < paramcount-3; pos++) {
if (params[pos][strlen(params[pos])-1] == '"' &&
get_params_match(params, pos+1))
return pos+1;
}
}
best = paramcount-3;
for (pos = paramcount-3; pos > 0; pos--) {
if (get_params_match(params, pos))
best = pos;
}
return best;
}
/* CTCP: DCC SEND */
static void ctcp_msg_dcc_send(IRC_SERVER_REC *server, const char *data,
const char *nick, const char *addr,
const char *target, CHAT_DCC_REC *chat)
{
GET_DCC_REC *dcc;
IPADDR ip;
char **params, *fname;
int paramcount, fileparams;
int port, len, quoted = FALSE;
long size;
/* SEND <file name> <address> <port> <size> [...] */
params = g_strsplit(data, " ", -1);
paramcount = strarray_length(params);
if (paramcount < 4) {
signal_emit("dcc error ctcp", 5, "SEND", data,
nick, addr, target);
g_strfreev(params);
return;
}
fileparams = get_file_params_count(params, paramcount);
dcc_str2ip(params[fileparams], &ip);
port = atoi(params[fileparams+1]);
size = atol(params[fileparams+2]);
params[fileparams] = NULL;
fname = g_strjoinv(" ", params);
g_strfreev(params);
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;
}
dcc = DCC_GET(dcc_find_request(DCC_GET_TYPE, nick, fname));
if (dcc != NULL) {
/* same DCC request offered again, remove the old one */
dcc_destroy(DCC(dcc));
}
dcc = dcc_get_create(server, chat, nick, fname);
dcc->target = g_strdup(target);
memcpy(&dcc->addr, &ip, sizeof(ip));
net_ip2host(&dcc->addr, dcc->addrstr);
dcc->port = port;
dcc->size = size;
dcc->file_quoted = quoted;
signal_emit("dcc request", 2, dcc, addr);
g_free(fname);
}
/* handle receiving DCC - GET/RESUME. */
void cmd_dcc_receive(const char *data, DCC_GET_FUNC accept_func)
{
GET_DCC_REC *dcc;
GSList *tmp, *next;
char *nick, *fname;
void *free_arg;
int found;
g_return_if_fail(data != NULL);
if (!cmd_get_params(data, &free_arg, 2 | PARAM_FLAG_GETREST,
&nick, &fname))
return;
if (*nick == '\0') {
dcc = DCC_GET(dcc_find_request_latest(DCC_GET_TYPE));
if (dcc != NULL)
accept_func(dcc);
cmd_params_free(free_arg);
return;
}
found = FALSE;
for (tmp = dcc_conns; tmp != NULL; tmp = next) {
GET_DCC_REC *dcc = tmp->data;
next = tmp->next;
if (IS_DCC_GET(dcc) && dcc_is_waiting_user(dcc) &&
g_strcasecmp(dcc->nick, nick) == 0 &&
(*fname == '\0' || strcmp(dcc->arg, fname) == 0)) {
found = TRUE;
accept_func(dcc);
}
}
if (!found)
signal_emit("dcc error get not found", 1, nick);
cmd_params_free(free_arg);
}
/* SYNTAX: DCC GET [<nick> [<file>]] */
static void cmd_dcc_get(const char *data)
{
cmd_dcc_receive(data, dcc_get_connect);
}
static void read_settings(void)
{
dcc_file_create_mode =
octal2dec(settings_get_int("dcc_file_create_mode"));
}
void dcc_get_init(void)
{
dcc_register_type("GET");
settings_add_bool("dcc", "dcc_autorename", FALSE);
settings_add_str("dcc", "dcc_download_path", "~");
settings_add_int("dcc", "dcc_file_create_mode", 644);
read_settings();
signal_add("dcc destroyed", (SIGNAL_FUNC) sig_dcc_destroyed);
signal_add("ctcp msg dcc send", (SIGNAL_FUNC) ctcp_msg_dcc_send);
signal_add("setup changed", (SIGNAL_FUNC) read_settings);
command_bind("dcc get", NULL, (SIGNAL_FUNC) cmd_dcc_get);
}
void dcc_get_deinit(void)
{
dcc_unregister_type("GET");
signal_remove("dcc destroyed", (SIGNAL_FUNC) sig_dcc_destroyed);
signal_remove("ctcp msg dcc send", (SIGNAL_FUNC) ctcp_msg_dcc_send);
signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
command_unbind("dcc get", (SIGNAL_FUNC) cmd_dcc_get);
}
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