client.c 9.33 KB
Newer Older
1
2
3
4
5
/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
6
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org,
7
8
9
10
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
Philipp Schafft's avatar
Philipp Schafft committed
11
 * Copyright 2011-2014, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>,
12
13
 */

Jack Moffitt's avatar
Jack Moffitt committed
14
/* client.c
15
16
17
18
 **
 ** client interface implementation
 **
 */
Jack Moffitt's avatar
Jack Moffitt committed
19

20
21
22
23
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

Jack Moffitt's avatar
Jack Moffitt committed
24
25
26
#include <stdlib.h>
#include <string.h>

Marvin Scholz's avatar
Marvin Scholz committed
27
28
29
#include "common/thread/thread.h"
#include "common/avl/avl.h"
#include "common/httpp/httpp.h"
Jack Moffitt's avatar
Jack Moffitt committed
30

31
#include "cfgfile.h"
Jack Moffitt's avatar
Jack Moffitt committed
32
33
#include "connection.h"
#include "refbuf.h"
Karl Heyes's avatar
Karl Heyes committed
34
#include "format.h"
35
#include "stats.h"
36
#include "fserve.h"
Jack Moffitt's avatar
Jack Moffitt committed
37
38

#include "client.h"
Philipp Schafft's avatar
Philipp Schafft committed
39
#include "auth.h"
Jack Moffitt's avatar
Jack Moffitt committed
40
#include "logging.h"
41

42
43
#include "util.h"

Philipp Schafft's avatar
Philipp Schafft committed
44
45
46
/* for ADMIN_COMMAND_ERROR */
#include "admin.h"

47
48
49
#ifdef _WIN32
#define snprintf _snprintf
#endif
Jack Moffitt's avatar
Jack Moffitt committed
50

51
52
53
#undef CATMODULE
#define CATMODULE "client"

54
55
static inline void client_send_500(client_t *client, const char *message);

56
57
58
59
60
/* create a client_t with the provided connection and parser details. Return
 * 0 on success, -1 if server limit has been reached.  In either case a
 * client_t is returned just in case a message needs to be returned. Should
 * be called with global lock held.
 */
61
int client_create(client_t **c_ptr, connection_t *con, http_parser_t *parser)
Jack Moffitt's avatar
Jack Moffitt committed
62
{
Marvin Scholz's avatar
Marvin Scholz committed
63
64
65
    ice_config_t    *config;
    client_t        *client = (client_t *) calloc(1, sizeof(client_t));
    int              ret    = -1;
66
67

    if (client == NULL)
68
        abort();
69

70
    config = config_get_config();
71
72

    global.clients++;
Marvin Scholz's avatar
Marvin Scholz committed
73
    if (config->client_limit < global.clients) {
74
        ICECAST_LOG_WARN("server client limit reached (%d/%d)", config->client_limit, global.clients);
Marvin Scholz's avatar
Marvin Scholz committed
75
    } else {
76
        ret = 0;
Marvin Scholz's avatar
Marvin Scholz committed
77
    }
Jack Moffitt's avatar
Jack Moffitt committed
78

79
80
81
    config_release_config ();

    stats_event_args (NULL, "clients", "%d", global.clients);
82
83
    client->con = con;
    client->parser = parser;
Philipp Schafft's avatar
Philipp Schafft committed
84
85
    client->protocol = ICECAST_PROTOCOL_HTTP;
    client->admin_command = ADMIN_COMMAND_ERROR;
86
87
    client->refbuf = refbuf_new (PER_CLIENT_REFBUF_SIZE);
    client->refbuf->len = 0; /* force reader code to ignore buffer contents */
88
    client->pos = 0;
89
    client->write_to_client = format_generic_write_to_client;
90
    *c_ptr = client;
Jack Moffitt's avatar
Jack Moffitt committed
91

92
    return ret;
Jack Moffitt's avatar
Jack Moffitt committed
93
94
}

95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
static inline void client_reuseconnection(client_t *client) {
    connection_t *con;
    reuse_t reuse;

    if (!client)
        return;

    con = client->con;
    con = connection_create(con->sock, con->serversock, strdup(con->ip));
    reuse = client->reuse;
    client->con->sock = -1; /* TODO: do not use magic */
    client->reuse = ICECAST_REUSE_CLOSE;

    client_destroy(client);

110
111
    if (reuse == ICECAST_REUSE_UPGRADETLS)
        connection_uses_ssl(con);
112
113
114
    connection_queue(con);
}

Jack Moffitt's avatar
Jack Moffitt committed
115
116
void client_destroy(client_t *client)
{
Philipp Schafft's avatar
Philipp Schafft committed
117
    ICECAST_LOG_DEBUG("Called to destory client %p", client);
Karl Heyes's avatar
Karl Heyes committed
118
119
    if (client == NULL)
        return;
120

121
122
123
124
125
    if (client->reuse != ICECAST_REUSE_CLOSE) {
        client_reuseconnection(client);
        return;
    }

126
127
    /* release the buffer now, as the buffer could be on the source queue
     * and may of disappeared after auth completes */
Marvin Scholz's avatar
Marvin Scholz committed
128
    if (client->refbuf) {
129
130
131
132
        refbuf_release (client->refbuf);
        client->refbuf = NULL;
    }

Philipp Schafft's avatar
Philipp Schafft committed
133
    if (auth_release_client(client))
134
135
        return;

136
    /* write log entry if ip is set (some things don't set it, like outgoing
137
138
     * slave requests
     */
Karl Heyes's avatar
Karl Heyes committed
139
    if (client->respcode && client->parser)
140
        logging_access(client);
141
142
    if (client->con)
        connection_close(client->con);
Karl Heyes's avatar
Karl Heyes committed
143
144
    if (client->parser)
        httpp_destroy(client->parser);
Jack Moffitt's avatar
Jack Moffitt committed
145

146
    global_lock();
147
    global.clients--;
148
149
    stats_event_args(NULL, "clients", "%d", global.clients);
    global_unlock();
150

151
152
    /* we need to free client specific format data (if any) */
    if (client->free_client_data)
153
        client->free_client_data(client);
154

Michael Smith's avatar
Michael Smith committed
155
    free(client->username);
Karl Heyes's avatar
Karl Heyes committed
156
    free(client->password);
Philipp Schafft's avatar
Philipp Schafft committed
157
158
    free(client->role);
    acl_release(client->acl);
Michael Smith's avatar
Michael Smith committed
159

160
    free(client);
Jack Moffitt's avatar
Jack Moffitt committed
161
}
162

163
/* helper function for reading data from a client */
164
int client_read_bytes(client_t *client, void *buf, unsigned len)
165
{
166
    int bytes;
167

Marvin Scholz's avatar
Marvin Scholz committed
168
    if (client->refbuf && client->refbuf->len) {
169
170
171
172
        /* we have data to read from a refbuf first */
        if (client->refbuf->len < len)
            len = client->refbuf->len;
        memcpy (buf, client->refbuf->data, len);
Marvin Scholz's avatar
Marvin Scholz committed
173
        if (len < client->refbuf->len) {
174
175
176
177
178
179
            char *ptr = client->refbuf->data;
            memmove (ptr, ptr+len, client->refbuf->len - len);
        }
        client->refbuf->len -= len;
        return len;
    }
180
    bytes = client->con->read (client->con, buf, len);
181

182
    if (bytes == -1 && client->con->error)
183
        ICECAST_LOG_DEBUG("reading from connection has failed");
184
185

    return bytes;
186
187
}

188
void client_send_error(client_t *client, int status, int plain, const char *message)
189
{
190
    ssize_t ret;
191
    refbuf_t *data;
192

193
194
195
196
197
    if (status == 500) {
         client_send_500(client, message);
         return;
    }

198
199
200
201
202
203
    data = refbuf_new(PER_CLIENT_REFBUF_SIZE);
    if (!data) {
         client_send_500(client, message);
         return;
    }

204
205
    client->reuse = ICECAST_REUSE_KEEPALIVE;

206
    ret = util_http_build_header(client->refbuf->data, PER_CLIENT_REFBUF_SIZE, 0,
207
                                 0, status, NULL,
208
                                 plain ? "text/plain" : "text/html", "utf-8",
209
                                 NULL, NULL, client);
210

211
212
213
214
215
216
    if (ret == -1 || ret >= PER_CLIENT_REFBUF_SIZE) {
        ICECAST_LOG_ERROR("Dropping client as we can not build response headers.");
        client_send_500(client, "Header generation failed.");
        return;
    }

217
218
219
220
221
    if (plain) {
        strncpy(data->data, message, data->len);
        data->data[data->len-1] = 0;
    } else {
        snprintf(data->data, data->len,
222
223
                 "<html><head><title>Error %i</title></head><body><b>%i - %s</b></body></html>\r\n",
                 status, status, message);
224
225
226
227
    }
    data->len = strlen(data->data);

    snprintf(client->refbuf->data + ret, PER_CLIENT_REFBUF_SIZE - ret,
228
             "Content-Length: %llu\r\n\r\n",
229
             (long long unsigned int)data->len);
230

231
    client->respcode = status;
232
    client->refbuf->len = strlen (client->refbuf->data);
233
234
    client->refbuf->next = data;

235
    fserve_add_client (client, NULL);
236
237
}

238
239
240
241
242
243
void client_send_100(client_t *client)
{
    /* On demand inject a HTTP/1.1 100 Continue to make sure clients are happy */
    sock_write (client->con->sock, "HTTP/1.1 100 Continue\r\n\r\n");
}

244
245
246
247
248
249
250
251
252
253
254
255
void client_send_101(client_t *client, reuse_t reuse)
{
    ssize_t ret;

    if (!client)
        return;

    if (reuse != ICECAST_REUSE_UPGRADETLS) {
        client_send_500(client, "Bad reuse parameter");
        return;
    }

256
257
    client->reuse = reuse;

258
259
260
261
262
263
    ret = util_http_build_header(client->refbuf->data, PER_CLIENT_REFBUF_SIZE, 0,
                                 0, 101, NULL,
                                 "text/plain", "utf-8",
                                 NULL, NULL, client);

    snprintf(client->refbuf->data + ret, PER_CLIENT_REFBUF_SIZE - ret,
264
             "Content-Length: 0\r\nUpgrade: TLS/1.0, HTTP/1.0\r\n\r\n");
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283

    client->respcode = 101;
    client->refbuf->len = strlen(client->refbuf->data);

    fserve_add_client(client, NULL);
}

void client_send_426(client_t *client, reuse_t reuse)
{
    ssize_t ret;

    if (!client)
        return;

    if (reuse != ICECAST_REUSE_UPGRADETLS) {
        client_send_500(client, "Bad reuse parameter");
        return;
    }

284
285
    client->reuse = reuse;

286
287
288
289
290
291
    ret = util_http_build_header(client->refbuf->data, PER_CLIENT_REFBUF_SIZE, 0,
                                 0, 426, NULL,
                                 "text/plain", "utf-8",
                                 NULL, NULL, client);

    snprintf(client->refbuf->data + ret, PER_CLIENT_REFBUF_SIZE - ret,
292
             "Content-Length: 0\r\nUpgrade: TLS/1.0, HTTP/1.0\r\n\r\n");
293
294
295
296
297
298
299
300
301

    client->respcode = 426;
    client->refbuf->len = strlen(client->refbuf->data);

    client->reuse = ICECAST_REUSE_KEEPALIVE;

    fserve_add_client(client, NULL);
}

302
/* this function is designed to work even if client is in bad state */
Marvin Scholz's avatar
Marvin Scholz committed
303
304
static inline void client_send_500(client_t *client, const char *message)
{
305
306
    const char header[] = "HTTP/1.0 500 Internal Server Error\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n"
                          "500 - Internal Server Error\n---------------------------\n";
Philipp Schafft's avatar
Philipp Schafft committed
307
308
    const ssize_t header_len = sizeof(header) - 1;
    ssize_t ret;
309
310
311
312
313
314
315
316
317

    ret = client_send_bytes(client, header, header_len);

    /* only send message if we have one AND if header could have transmitted completly */
    if (message && ret == header_len)
        client_send_bytes(client, message, strlen(message));

    client_destroy(client);
}
318
319

/* helper function for sending the data to a client */
320
int client_send_bytes(client_t *client, const void *buf, unsigned len)
321
{
322
    int ret = client->con->send(client->con, buf, len);
323
324

    if (client->con->error)
325
        ICECAST_LOG_DEBUG("Client connection died");
326

327
328
329
    return ret;
}

330
void client_set_queue(client_t *client, refbuf_t *refbuf)
Karl Heyes's avatar
Karl Heyes committed
331
332
333
334
{
    refbuf_t *to_release = client->refbuf;

    client->refbuf = refbuf;
Karl Heyes's avatar
Karl Heyes committed
335
    if (refbuf)
336
        refbuf_addref(client->refbuf);
Karl Heyes's avatar
Karl Heyes committed
337
338
    client->pos = 0;
    if (to_release)
339
        refbuf_release(to_release);
Karl Heyes's avatar
Karl Heyes committed
340
}