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1
/*
2
 * HTTP protocol for ffmpeg client
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
4
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
#include "libavutil/avstring.h"
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#include "avformat.h"
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#include <unistd.h>
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#include <strings.h>
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#include "internal.h"
27
#include "network.h"
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#include "http.h"
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#include "os_support.h"
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#include "httpauth.h"
31
#include "libavutil/opt.h"
32

    
33
/* XXX: POST protocol is not completely implemented because ffmpeg uses
34
   only a subset of it. */
35

    
36
/* used for protocol handling */
37
#define BUFFER_SIZE 1024
38
#define MAX_REDIRECTS 8
39

    
40
typedef struct {
41
    const AVClass *class;
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    URLContext *hd;
43
    unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
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    int line_count;
45
    int http_code;
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    int64_t chunksize;      /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
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    int64_t off, filesize;
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    char location[MAX_URL_SIZE];
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    HTTPAuthState auth_state;
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    unsigned char headers[BUFFER_SIZE];
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    int willclose;          /**< Set if the server correctly handles Connection: close and will close the connection after feeding us the content. */
52
} HTTPContext;
53

    
54
#define OFFSET(x) offsetof(HTTPContext, x)
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static const AVOption options[] = {
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{"chunksize", "use chunked transfer-encoding for posts, -1 disables it, 0 enables it", OFFSET(chunksize), FF_OPT_TYPE_INT64, 0, -1, 0 }, /* Default to 0, for chunked POSTs */
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{NULL}
58
};
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static const AVClass httpcontext_class = {
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    "HTTP", av_default_item_name, options, LIBAVUTIL_VERSION_INT
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};
62

    
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static int http_connect(URLContext *h, const char *path, const char *hoststr,
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                        const char *auth, int *new_location);
65

    
66
void ff_http_set_headers(URLContext *h, const char *headers)
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{
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    HTTPContext *s = h->priv_data;
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    int len = strlen(headers);
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    if (len && strcmp("\r\n", headers + len - 2))
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        av_log(NULL, AV_LOG_ERROR, "No trailing CRLF found in HTTP header.\n");
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    av_strlcpy(s->headers, headers, sizeof(s->headers));
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}
76

    
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void ff_http_set_chunked_transfer_encoding(URLContext *h, int is_chunked)
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{
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    ((HTTPContext*)h->priv_data)->chunksize = is_chunked ? 0 : -1;
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}
81

    
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void ff_http_init_auth_state(URLContext *dest, const URLContext *src)
83
{
84
    memcpy(&((HTTPContext*)dest->priv_data)->auth_state,
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           &((HTTPContext*)src->priv_data)->auth_state, sizeof(HTTPAuthState));
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}
87

    
88
/* return non zero if error */
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static int http_open_cnx(URLContext *h)
90
{
91
    const char *path, *proxy_path;
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    char hostname[1024], hoststr[1024];
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    char auth[1024];
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    char path1[1024];
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    char buf[1024];
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    int port, use_proxy, err, location_changed = 0, redirects = 0;
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    HTTPAuthType cur_auth_type;
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    HTTPContext *s = h->priv_data;
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    URLContext *hd = NULL;
100

    
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    proxy_path = getenv("http_proxy");
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    use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
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        av_strstart(proxy_path, "http://", NULL);
104

    
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    /* fill the dest addr */
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 redo:
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    /* needed in any case to build the host string */
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    av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
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                 path1, sizeof(path1), s->location);
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    ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
111

    
112
    if (use_proxy) {
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        av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
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                     NULL, 0, proxy_path);
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        path = s->location;
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    } else {
117
        if (path1[0] == '\0')
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            path = "/";
119
        else
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            path = path1;
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    }
122
    if (port < 0)
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        port = 80;
124

    
125
    ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
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    err = url_open(&hd, buf, URL_RDWR);
127
    if (err < 0)
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        goto fail;
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    s->hd = hd;
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    cur_auth_type = s->auth_state.auth_type;
132
    if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
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        goto fail;
134
    if (s->http_code == 401) {
135
        if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
136
            url_close(hd);
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            goto redo;
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        } else
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            goto fail;
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    }
141
    if ((s->http_code == 301 || s->http_code == 302 || s->http_code == 303 || s->http_code == 307)
142
        && location_changed == 1) {
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        /* url moved, get next */
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        url_close(hd);
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        if (redirects++ >= MAX_REDIRECTS)
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            return AVERROR(EIO);
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        location_changed = 0;
148
        goto redo;
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    }
150
    return 0;
151
 fail:
152
    if (hd)
153
        url_close(hd);
154
    s->hd = NULL;
155
    return AVERROR(EIO);
156
}
157

    
158
static int http_open(URLContext *h, const char *uri, int flags)
159
{
160
    HTTPContext *s = h->priv_data;
161

    
162
    h->is_streamed = 1;
163

    
164
    s->filesize = -1;
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    av_strlcpy(s->location, uri, sizeof(s->location));
166

    
167
    return http_open_cnx(h);
168
}
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static int http_getc(HTTPContext *s)
170
{
171
    int len;
172
    if (s->buf_ptr >= s->buf_end) {
173
        len = url_read(s->hd, s->buffer, BUFFER_SIZE);
174
        if (len < 0) {
175
            return AVERROR(EIO);
176
        } else if (len == 0) {
177
            return -1;
178
        } else {
179
            s->buf_ptr = s->buffer;
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            s->buf_end = s->buffer + len;
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        }
182
    }
183
    return *s->buf_ptr++;
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}
185

    
186
static int http_get_line(HTTPContext *s, char *line, int line_size)
187
{
188
    int ch;
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    char *q;
190

    
191
    q = line;
192
    for(;;) {
193
        ch = http_getc(s);
194
        if (ch < 0)
195
            return AVERROR(EIO);
196
        if (ch == '\n') {
197
            /* process line */
198
            if (q > line && q[-1] == '\r')
199
                q--;
200
            *q = '\0';
201

    
202
            return 0;
203
        } else {
204
            if ((q - line) < line_size - 1)
205
                *q++ = ch;
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        }
207
    }
208
}
209

    
210
static int process_line(URLContext *h, char *line, int line_count,
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                        int *new_location)
212
{
213
    HTTPContext *s = h->priv_data;
214
    char *tag, *p, *end;
215

    
216
    /* end of header */
217
    if (line[0] == '\0')
218
        return 0;
219

    
220
    p = line;
221
    if (line_count == 0) {
222
        while (!isspace(*p) && *p != '\0')
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            p++;
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        while (isspace(*p))
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            p++;
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        s->http_code = strtol(p, &end, 10);
227

    
228
        av_dlog(NULL, "http_code=%d\n", s->http_code);
229

    
230
        /* error codes are 4xx and 5xx, but regard 401 as a success, so we
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         * don't abort until all headers have been parsed. */
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        if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401) {
233
            end += strspn(end, SPACE_CHARS);
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            av_log(NULL, AV_LOG_WARNING, "HTTP error %d %s\n",
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                   s->http_code, end);
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            return -1;
237
        }
238
    } else {
239
        while (*p != '\0' && *p != ':')
240
            p++;
241
        if (*p != ':')
242
            return 1;
243

    
244
        *p = '\0';
245
        tag = line;
246
        p++;
247
        while (isspace(*p))
248
            p++;
249
        if (!strcmp(tag, "Location")) {
250
            strcpy(s->location, p);
251
            *new_location = 1;
252
        } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
253
            s->filesize = atoll(p);
254
        } else if (!strcmp (tag, "Content-Range")) {
255
            /* "bytes $from-$to/$document_size" */
256
            const char *slash;
257
            if (!strncmp (p, "bytes ", 6)) {
258
                p += 6;
259
                s->off = atoll(p);
260
                if ((slash = strchr(p, '/')) && strlen(slash) > 0)
261
                    s->filesize = atoll(slash+1);
262
            }
263
            h->is_streamed = 0; /* we _can_ in fact seek */
264
        } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
265
            s->filesize = -1;
266
            s->chunksize = 0;
267
        } else if (!strcmp (tag, "WWW-Authenticate")) {
268
            ff_http_auth_handle_header(&s->auth_state, tag, p);
269
        } else if (!strcmp (tag, "Authentication-Info")) {
270
            ff_http_auth_handle_header(&s->auth_state, tag, p);
271
        } else if (!strcmp (tag, "Connection")) {
272
            if (!strcmp(p, "close"))
273
                s->willclose = 1;
274
        }
275
    }
276
    return 1;
277
}
278

    
279
static inline int has_header(const char *str, const char *header)
280
{
281
    /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
282
    return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
283
}
284

    
285
static int http_connect(URLContext *h, const char *path, const char *hoststr,
286
                        const char *auth, int *new_location)
287
{
288
    HTTPContext *s = h->priv_data;
289
    int post, err;
290
    char line[1024];
291
    char headers[1024] = "";
292
    char *authstr = NULL;
293
    int64_t off = s->off;
294
    int len = 0;
295

    
296

    
297
    /* send http header */
298
    post = h->flags & URL_WRONLY;
299
    authstr = ff_http_auth_create_response(&s->auth_state, auth, path,
300
                                        post ? "POST" : "GET");
301

    
302
    /* set default headers if needed */
303
    if (!has_header(s->headers, "\r\nUser-Agent: "))
304
       len += av_strlcatf(headers + len, sizeof(headers) - len,
305
                          "User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
306
    if (!has_header(s->headers, "\r\nAccept: "))
307
        len += av_strlcpy(headers + len, "Accept: */*\r\n",
308
                          sizeof(headers) - len);
309
    if (!has_header(s->headers, "\r\nRange: "))
310
        len += av_strlcatf(headers + len, sizeof(headers) - len,
311
                           "Range: bytes=%"PRId64"-\r\n", s->off);
312
    if (!has_header(s->headers, "\r\nConnection: "))
313
        len += av_strlcpy(headers + len, "Connection: close\r\n",
314
                          sizeof(headers)-len);
315
    if (!has_header(s->headers, "\r\nHost: "))
316
        len += av_strlcatf(headers + len, sizeof(headers) - len,
317
                           "Host: %s\r\n", hoststr);
318

    
319
    /* now add in custom headers */
320
    av_strlcpy(headers+len, s->headers, sizeof(headers)-len);
321

    
322
    snprintf(s->buffer, sizeof(s->buffer),
323
             "%s %s HTTP/1.1\r\n"
324
             "%s"
325
             "%s"
326
             "%s"
327
             "\r\n",
328
             post ? "POST" : "GET",
329
             path,
330
             post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "",
331
             headers,
332
             authstr ? authstr : "");
333

    
334
    av_freep(&authstr);
335
    if (url_write(s->hd, s->buffer, strlen(s->buffer)) < 0)
336
        return AVERROR(EIO);
337

    
338
    /* init input buffer */
339
    s->buf_ptr = s->buffer;
340
    s->buf_end = s->buffer;
341
    s->line_count = 0;
342
    s->off = 0;
343
    s->filesize = -1;
344
    s->willclose = 0;
345
    if (post) {
346
        /* Pretend that it did work. We didn't read any header yet, since
347
         * we've still to send the POST data, but the code calling this
348
         * function will check http_code after we return. */
349
        s->http_code = 200;
350
        return 0;
351
    }
352
    s->chunksize = -1;
353

    
354
    /* wait for header */
355
    for(;;) {
356
        if (http_get_line(s, line, sizeof(line)) < 0)
357
            return AVERROR(EIO);
358

    
359
        av_dlog(NULL, "header='%s'\n", line);
360

    
361
        err = process_line(h, line, s->line_count, new_location);
362
        if (err < 0)
363
            return err;
364
        if (err == 0)
365
            break;
366
        s->line_count++;
367
    }
368

    
369
    return (off == s->off) ? 0 : -1;
370
}
371

    
372

    
373
static int http_read(URLContext *h, uint8_t *buf, int size)
374
{
375
    HTTPContext *s = h->priv_data;
376
    int len;
377

    
378
    if (s->chunksize >= 0) {
379
        if (!s->chunksize) {
380
            char line[32];
381

    
382
            for(;;) {
383
                do {
384
                    if (http_get_line(s, line, sizeof(line)) < 0)
385
                        return AVERROR(EIO);
386
                } while (!*line);    /* skip CR LF from last chunk */
387

    
388
                s->chunksize = strtoll(line, NULL, 16);
389

    
390
                av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
391

    
392
                if (!s->chunksize)
393
                    return 0;
394
                break;
395
            }
396
        }
397
        size = FFMIN(size, s->chunksize);
398
    }
399
    /* read bytes from input buffer first */
400
    len = s->buf_end - s->buf_ptr;
401
    if (len > 0) {
402
        if (len > size)
403
            len = size;
404
        memcpy(buf, s->buf_ptr, len);
405
        s->buf_ptr += len;
406
    } else {
407
        if (!s->willclose && s->filesize >= 0 && s->off >= s->filesize)
408
            return AVERROR_EOF;
409
        len = url_read(s->hd, buf, size);
410
    }
411
    if (len > 0) {
412
        s->off += len;
413
        if (s->chunksize > 0)
414
            s->chunksize -= len;
415
    }
416
    return len;
417
}
418

    
419
/* used only when posting data */
420
static int http_write(URLContext *h, const uint8_t *buf, int size)
421
{
422
    char temp[11] = "";  /* 32-bit hex + CRLF + nul */
423
    int ret;
424
    char crlf[] = "\r\n";
425
    HTTPContext *s = h->priv_data;
426

    
427
    if (s->chunksize == -1) {
428
        /* non-chunked data is sent without any special encoding */
429
        return url_write(s->hd, buf, size);
430
    }
431

    
432
    /* silently ignore zero-size data since chunk encoding that would
433
     * signal EOF */
434
    if (size > 0) {
435
        /* upload data using chunked encoding */
436
        snprintf(temp, sizeof(temp), "%x\r\n", size);
437

    
438
        if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 ||
439
            (ret = url_write(s->hd, buf, size)) < 0 ||
440
            (ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
441
            return ret;
442
    }
443
    return size;
444
}
445

    
446
static int http_close(URLContext *h)
447
{
448
    int ret = 0;
449
    char footer[] = "0\r\n\r\n";
450
    HTTPContext *s = h->priv_data;
451

    
452
    /* signal end of chunked encoding if used */
453
    if ((h->flags & URL_WRONLY) && s->chunksize != -1) {
454
        ret = url_write(s->hd, footer, sizeof(footer) - 1);
455
        ret = ret > 0 ? 0 : ret;
456
    }
457

    
458
    if (s->hd)
459
        url_close(s->hd);
460
    return ret;
461
}
462

    
463
static int64_t http_seek(URLContext *h, int64_t off, int whence)
464
{
465
    HTTPContext *s = h->priv_data;
466
    URLContext *old_hd = s->hd;
467
    int64_t old_off = s->off;
468
    uint8_t old_buf[BUFFER_SIZE];
469
    int old_buf_size;
470

    
471
    if (whence == AVSEEK_SIZE)
472
        return s->filesize;
473
    else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
474
        return -1;
475

    
476
    /* we save the old context in case the seek fails */
477
    old_buf_size = s->buf_end - s->buf_ptr;
478
    memcpy(old_buf, s->buf_ptr, old_buf_size);
479
    s->hd = NULL;
480
    if (whence == SEEK_CUR)
481
        off += s->off;
482
    else if (whence == SEEK_END)
483
        off += s->filesize;
484
    s->off = off;
485

    
486
    /* if it fails, continue on old connection */
487
    if (http_open_cnx(h) < 0) {
488
        memcpy(s->buffer, old_buf, old_buf_size);
489
        s->buf_ptr = s->buffer;
490
        s->buf_end = s->buffer + old_buf_size;
491
        s->hd = old_hd;
492
        s->off = old_off;
493
        return -1;
494
    }
495
    url_close(old_hd);
496
    return off;
497
}
498

    
499
static int
500
http_get_file_handle(URLContext *h)
501
{
502
    HTTPContext *s = h->priv_data;
503
    return url_get_file_handle(s->hd);
504
}
505

    
506
URLProtocol ff_http_protocol = {
507
    "http",
508
    http_open,
509
    http_read,
510
    http_write,
511
    http_seek,
512
    http_close,
513
    .url_get_file_handle = http_get_file_handle,
514
    .priv_data_size = sizeof(HTTPContext),
515
    .priv_data_class = &httpcontext_class,
516
};