summaryrefslogtreecommitdiff
path: root/src/irc/dcc/dcc-resume.c
blob: ce0ac925133a463ed3750bcb455618cb8c81fc99 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/*
 dcc-resume.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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "module.h"
#include "signals.h"
#include "commands.h"
#include "network.h"
#include "misc.h"

#include "dcc-file.h"
#include "dcc-get.h"
#include "dcc-send.h"
#include "dcc-chat.h"

static FILE_DCC_REC *dcc_resume_find(int type, const char *nick, int port)
{
	GSList *tmp;

	for (tmp = dcc_conns; tmp != NULL; tmp = tmp->next) {
		FILE_DCC_REC *dcc = tmp->data;

		if (dcc->type == type && !dcc_is_connected(dcc) &&
		    dcc->port == port &&
		    g_ascii_strcasecmp(dcc->nick, nick) == 0)
			return dcc;
	}

	return NULL;
}

#define get_params_match_resume(params, pos) \
	(is_numeric(params[pos], '\0') && atol(params[pos]) < 65536 && \
	is_numeric(params[(pos)+1], '\0'))

/* Based on get_file_params_count() found in dcc-get.c. The main difference
   is represented by the number of params expected after the filename (2 at
   least). I've added this new routine to avoid possible troubles connected
   to relaxing the old checks done on DCC GET params to suite the ACCEPT/RESUME
   needs.
   */
int get_file_params_count_resume(char **params, int paramcount)
{
	int pos, best;

	if (*params[0] == '"') {
		/* quoted file name? */
		for (pos = 0; pos < paramcount-2; pos++) {
			if (strlen(params[pos]) == 0)
				continue;
			if (params[pos][strlen(params[pos])-1] == '"' &&
			    get_params_match_resume(params, pos+1))
				return pos+1;
		}
	}

	best = paramcount-2;
	for (pos = paramcount-2; pos > 0; pos--) {
		if (get_params_match_resume(params, pos))
			best = pos;
	}

	return best;
}


static int dcc_ctcp_resume_parse(int type, const char *data, const char *nick,
				 FILE_DCC_REC **dcc, uoff_t *size, int *pasv_id)
{
	char **params;
	int paramcount, fileparams;
	int port;

	/* RESUME|ACCEPT <file name> <port> <size> */
	/* RESUME|ACCEPT <file name> 0 <size> <id> (passive protocol) */
	params = g_strsplit(data, " ", -1);
	paramcount = g_strv_length(params);

	if (paramcount < 3)
		return 0;

	fileparams = get_file_params_count_resume(params, paramcount);

	if (paramcount >= fileparams + 2) {
		port = atoi(params[fileparams]);
		*size = str_to_uofft(params[fileparams+1]);
		*pasv_id = ((port == 0) && (paramcount == fileparams + 3)) ? atoi(params[fileparams+2]) : -1;
		*dcc = dcc_resume_find(type, nick, port);
		g_strfreev(params);

		/* If the ID is different then the DCC cannot be resumed */
		return ((*dcc != NULL) && ((*dcc)->pasv_id == *pasv_id));
	}
	g_strfreev(params);
	return FALSE;
}

static int dcc_resume_file_check(FILE_DCC_REC *dcc, IRC_SERVER_REC *server,
				 uoff_t size)
{
	if (size >= dcc->size) {
		/* whole file sent */
		dcc->starttime = time(NULL);
		dcc_reject(DCC(dcc), server);
	} else if (lseek(dcc->fhandle, (off_t)size, SEEK_SET) != (off_t)size) {
		/* error */
		dcc_reject(DCC(dcc), server);
	} else {
		dcc->transfd = dcc->skipped = size;
                return TRUE;
	}

	return FALSE;
}

/* CTCP: DCC RESUME - requesting to resume DCC SEND */
static void ctcp_msg_dcc_resume(IRC_SERVER_REC *server, const char *data,
				const char *nick, const char *addr,
				const char *target, DCC_REC *chat)
{
	FILE_DCC_REC *dcc;
        char *str;
	uoff_t size;
	int pasv_id = -1;

	if (!dcc_ctcp_resume_parse(DCC_SEND_TYPE, data, nick, &dcc, &size, &pasv_id)) {
		signal_emit("dcc error ctcp", 5, "RESUME", data,
			    nick, addr, target);
	} else if (dcc != NULL && dcc_resume_file_check(dcc, server, size)) {
		if (!dcc_is_passive(dcc)) {
			str = g_strdup_printf(DCC_SEND(dcc)->file_quoted ?
					      "DCC ACCEPT \"%s\" %d %"PRIuUOFF_T :
					      "DCC ACCEPT %s %d %"PRIuUOFF_T,
					      dcc->arg, dcc->port, dcc->transfd);
		} else {
			str = g_strdup_printf(DCC_SEND(dcc)->file_quoted ?
					      "DCC ACCEPT \"%s\" 0 %"PRIuUOFF_T" %d" :
					      "DCC ACCEPT %s 0 %"PRIuUOFF_T" %d",
					      dcc->arg, dcc->transfd, dcc->pasv_id);
		}
		dcc_ctcp_message(dcc->server, dcc->nick,
				 dcc->chat, FALSE, str);
		g_free(str);
	}
}

/* CTCP: DCC ACCEPT - accept resuming DCC GET */
static void ctcp_msg_dcc_accept(IRC_SERVER_REC *server, const char *data,
				const char *nick, const char *addr,
				const char *target, DCC_REC *chat)
{
	FILE_DCC_REC *dcc;
        uoff_t size;
	int pasv_id;

	if (!dcc_ctcp_resume_parse(DCC_GET_TYPE, data, nick, &dcc, &size, &pasv_id) ||
	    (dcc != NULL && DCC_GET(dcc)->get_type != DCC_GET_RESUME)) {
		signal_emit("dcc error ctcp", 5, "ACCEPT", data,
			    nick, addr, target);
	} else if (dcc != NULL && dcc_resume_file_check(dcc, server, size)) {
		if (!dcc_is_passive(dcc))
			dcc_get_connect(DCC_GET(dcc));
		else
			dcc_get_passive(DCC_GET(dcc));
	}
}

/* Resume a DCC GET */
static void dcc_send_resume(GET_DCC_REC *dcc)
{
        off_t pos;
	char *str;

        g_return_if_fail(dcc != NULL);

	dcc->file = dcc_get_download_path(dcc->arg);
	dcc->fhandle = open(dcc->file, O_WRONLY);
	if (dcc->fhandle == -1) {
		signal_emit("dcc error file open", 3, dcc->nick, dcc->file,
			    GINT_TO_POINTER(errno));
		return;
	}

	dcc->get_type = DCC_GET_RESUME;

	pos = lseek(dcc->fhandle, 0, SEEK_END);
	dcc->transfd = pos < 0 ? 0 : (uoff_t)pos;
	dcc->skipped = dcc->transfd;

	if (dcc->skipped == dcc->size) {
		/* already received whole file */
		dcc->starttime = time(NULL);
		dcc_reject(DCC(dcc), NULL);
	} else {
		if (!dcc_is_passive(dcc)) {
			str = g_strdup_printf(dcc->file_quoted ?
					      "DCC RESUME \"%s\" %d %"PRIuUOFF_T :
					      "DCC RESUME %s %d %"PRIuUOFF_T,
					      dcc->arg, dcc->port, dcc->transfd);
		} else {
			str = g_strdup_printf(dcc->file_quoted ?
					      "DCC RESUME \"%s\" 0 %"PRIuUOFF_T" %d" :
					      "DCC RESUME %s 0 %"PRIuUOFF_T" %d",
					      dcc->arg, dcc->transfd, dcc->pasv_id);
		}
		dcc_ctcp_message(dcc->server, dcc->nick,
				 dcc->chat, FALSE, str);
		g_free(str);
	}
}

/* SYNTAX: DCC RESUME [<nick> [<file>]] */
static void cmd_dcc_resume(const char *data)
{
	cmd_dcc_receive(data, dcc_send_resume, dcc_send_resume);
}

void dcc_resume_init(void)
{
	signal_add("ctcp msg dcc resume", (SIGNAL_FUNC) ctcp_msg_dcc_resume);
	signal_add("ctcp msg dcc accept", (SIGNAL_FUNC) ctcp_msg_dcc_accept);
	command_bind("dcc resume", NULL, (SIGNAL_FUNC) cmd_dcc_resume);
}

void dcc_resume_deinit(void)
{
	signal_remove("ctcp msg dcc resume", (SIGNAL_FUNC) ctcp_msg_dcc_resume);
	signal_remove("ctcp msg dcc accept", (SIGNAL_FUNC) ctcp_msg_dcc_accept);
	command_unbind("dcc resume", (SIGNAL_FUNC) cmd_dcc_resume);
}