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1
/*
2
 * HTTP protocol for ffmpeg client
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
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 *
5
 * 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"
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#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"
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#include "url.h"
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#include "libavutil/opt.h"
33

    
34
/* XXX: POST protocol is not completely implemented because ffmpeg uses
35
   only a subset of it. */
36

    
37
/* used for protocol handling */
38
#define BUFFER_SIZE 1024
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#define MAX_REDIRECTS 8
40

    
41
typedef struct {
42
    const AVClass *class;
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    URLContext *hd;
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    unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
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    int line_count;
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    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. */
53
} HTTPContext;
54

    
55
#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}
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};
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static const AVClass httpcontext_class = {
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    .class_name     = "HTTP",
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    .item_name      = av_default_item_name,
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    .option         = options,
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    .version        = LIBAVUTIL_VERSION_INT,
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};
66

    
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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);
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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(h, 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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}
80

    
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void ff_http_set_chunked_transfer_encoding(URLContext *h, int is_chunked)
82
{
83
    ((HTTPContext*)h->priv_data)->chunksize = is_chunked ? 0 : -1;
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}
85

    
86
void ff_http_init_auth_state(URLContext *dest, const URLContext *src)
87
{
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    memcpy(&((HTTPContext*)dest->priv_data)->auth_state,
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           &((HTTPContext*)src->priv_data)->auth_state, sizeof(HTTPAuthState));
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}
91

    
92
/* return non zero if error */
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static int http_open_cnx(URLContext *h)
94
{
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    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;
104

    
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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);
108

    
109
    /* fill the dest addr */
110
 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);
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116
    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 {
121
        if (path1[0] == '\0')
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            path = "/";
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        else
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            path = path1;
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    }
126
    if (port < 0)
127
        port = 80;
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129
    ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
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    err = ffurl_open(&hd, buf, AVIO_FLAG_READ_WRITE);
131
    if (err < 0)
132
        goto fail;
133

    
134
    s->hd = hd;
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    cur_auth_type = s->auth_state.auth_type;
136
    if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
137
        goto fail;
138
    if (s->http_code == 401) {
139
        if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
140
            ffurl_close(hd);
141
            goto redo;
142
        } else
143
            goto fail;
144
    }
145
    if ((s->http_code == 301 || s->http_code == 302 || s->http_code == 303 || s->http_code == 307)
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        && location_changed == 1) {
147
        /* url moved, get next */
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        ffurl_close(hd);
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        if (redirects++ >= MAX_REDIRECTS)
150
            return AVERROR(EIO);
151
        location_changed = 0;
152
        goto redo;
153
    }
154
    return 0;
155
 fail:
156
    if (hd)
157
        ffurl_close(hd);
158
    s->hd = NULL;
159
    return AVERROR(EIO);
160
}
161

    
162
static int http_open(URLContext *h, const char *uri, int flags)
163
{
164
    HTTPContext *s = h->priv_data;
165

    
166
    h->is_streamed = 1;
167

    
168
    s->filesize = -1;
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    av_strlcpy(s->location, uri, sizeof(s->location));
170

    
171
    return http_open_cnx(h);
172
}
173
static int http_getc(HTTPContext *s)
174
{
175
    int len;
176
    if (s->buf_ptr >= s->buf_end) {
177
        len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE);
178
        if (len < 0) {
179
            return AVERROR(EIO);
180
        } else if (len == 0) {
181
            return -1;
182
        } else {
183
            s->buf_ptr = s->buffer;
184
            s->buf_end = s->buffer + len;
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        }
186
    }
187
    return *s->buf_ptr++;
188
}
189

    
190
static int http_get_line(HTTPContext *s, char *line, int line_size)
191
{
192
    int ch;
193
    char *q;
194

    
195
    q = line;
196
    for(;;) {
197
        ch = http_getc(s);
198
        if (ch < 0)
199
            return AVERROR(EIO);
200
        if (ch == '\n') {
201
            /* process line */
202
            if (q > line && q[-1] == '\r')
203
                q--;
204
            *q = '\0';
205

    
206
            return 0;
207
        } else {
208
            if ((q - line) < line_size - 1)
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                *q++ = ch;
210
        }
211
    }
212
}
213

    
214
static int process_line(URLContext *h, char *line, int line_count,
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                        int *new_location)
216
{
217
    HTTPContext *s = h->priv_data;
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    char *tag, *p, *end;
219

    
220
    /* end of header */
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    if (line[0] == '\0')
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        return 0;
223

    
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    p = line;
225
    if (line_count == 0) {
226
        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);
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232
        av_dlog(NULL, "http_code=%d\n", s->http_code);
233

    
234
        /* 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. */
236
        if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401) {
237
            end += strspn(end, SPACE_CHARS);
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            av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n",
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                   s->http_code, end);
240
            return -1;
241
        }
242
    } else {
243
        while (*p != '\0' && *p != ':')
244
            p++;
245
        if (*p != ':')
246
            return 1;
247

    
248
        *p = '\0';
249
        tag = line;
250
        p++;
251
        while (isspace(*p))
252
            p++;
253
        if (!strcasecmp(tag, "Location")) {
254
            strcpy(s->location, p);
255
            *new_location = 1;
256
        } else if (!strcasecmp (tag, "Content-Length") && s->filesize == -1) {
257
            s->filesize = atoll(p);
258
        } else if (!strcasecmp (tag, "Content-Range")) {
259
            /* "bytes $from-$to/$document_size" */
260
            const char *slash;
261
            if (!strncmp (p, "bytes ", 6)) {
262
                p += 6;
263
                s->off = atoll(p);
264
                if ((slash = strchr(p, '/')) && strlen(slash) > 0)
265
                    s->filesize = atoll(slash+1);
266
            }
267
            h->is_streamed = 0; /* we _can_ in fact seek */
268
        } else if (!strcasecmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
269
            s->filesize = -1;
270
            s->chunksize = 0;
271
        } else if (!strcasecmp (tag, "WWW-Authenticate")) {
272
            ff_http_auth_handle_header(&s->auth_state, tag, p);
273
        } else if (!strcasecmp (tag, "Authentication-Info")) {
274
            ff_http_auth_handle_header(&s->auth_state, tag, p);
275
        } else if (!strcasecmp (tag, "Connection")) {
276
            if (!strcmp(p, "close"))
277
                s->willclose = 1;
278
        }
279
    }
280
    return 1;
281
}
282

    
283
static inline int has_header(const char *str, const char *header)
284
{
285
    /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
286
    return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
287
}
288

    
289
static int http_connect(URLContext *h, const char *path, const char *hoststr,
290
                        const char *auth, int *new_location)
291
{
292
    HTTPContext *s = h->priv_data;
293
    int post, err;
294
    char line[1024];
295
    char headers[1024] = "";
296
    char *authstr = NULL;
297
    int64_t off = s->off;
298
    int len = 0;
299

    
300

    
301
    /* send http header */
302
    post = h->flags & AVIO_FLAG_WRITE;
303
    authstr = ff_http_auth_create_response(&s->auth_state, auth, path,
304
                                        post ? "POST" : "GET");
305

    
306
    /* set default headers if needed */
307
    if (!has_header(s->headers, "\r\nUser-Agent: "))
308
       len += av_strlcatf(headers + len, sizeof(headers) - len,
309
                          "User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
310
    if (!has_header(s->headers, "\r\nAccept: "))
311
        len += av_strlcpy(headers + len, "Accept: */*\r\n",
312
                          sizeof(headers) - len);
313
    if (!has_header(s->headers, "\r\nRange: "))
314
        len += av_strlcatf(headers + len, sizeof(headers) - len,
315
                           "Range: bytes=%"PRId64"-\r\n", s->off);
316
    if (!has_header(s->headers, "\r\nConnection: "))
317
        len += av_strlcpy(headers + len, "Connection: close\r\n",
318
                          sizeof(headers)-len);
319
    if (!has_header(s->headers, "\r\nHost: "))
320
        len += av_strlcatf(headers + len, sizeof(headers) - len,
321
                           "Host: %s\r\n", hoststr);
322

    
323
    /* now add in custom headers */
324
    av_strlcpy(headers+len, s->headers, sizeof(headers)-len);
325

    
326
    snprintf(s->buffer, sizeof(s->buffer),
327
             "%s %s HTTP/1.1\r\n"
328
             "%s"
329
             "%s"
330
             "%s"
331
             "\r\n",
332
             post ? "POST" : "GET",
333
             path,
334
             post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "",
335
             headers,
336
             authstr ? authstr : "");
337

    
338
    av_freep(&authstr);
339
    if (ffurl_write(s->hd, s->buffer, strlen(s->buffer)) < 0)
340
        return AVERROR(EIO);
341

    
342
    /* init input buffer */
343
    s->buf_ptr = s->buffer;
344
    s->buf_end = s->buffer;
345
    s->line_count = 0;
346
    s->off = 0;
347
    s->filesize = -1;
348
    s->willclose = 0;
349
    if (post) {
350
        /* Pretend that it did work. We didn't read any header yet, since
351
         * we've still to send the POST data, but the code calling this
352
         * function will check http_code after we return. */
353
        s->http_code = 200;
354
        return 0;
355
    }
356
    s->chunksize = -1;
357

    
358
    /* wait for header */
359
    for(;;) {
360
        if (http_get_line(s, line, sizeof(line)) < 0)
361
            return AVERROR(EIO);
362

    
363
        av_dlog(NULL, "header='%s'\n", line);
364

    
365
        err = process_line(h, line, s->line_count, new_location);
366
        if (err < 0)
367
            return err;
368
        if (err == 0)
369
            break;
370
        s->line_count++;
371
    }
372

    
373
    return (off == s->off) ? 0 : -1;
374
}
375

    
376

    
377
static int http_read(URLContext *h, uint8_t *buf, int size)
378
{
379
    HTTPContext *s = h->priv_data;
380
    int len;
381

    
382
    if (s->chunksize >= 0) {
383
        if (!s->chunksize) {
384
            char line[32];
385

    
386
            for(;;) {
387
                do {
388
                    if (http_get_line(s, line, sizeof(line)) < 0)
389
                        return AVERROR(EIO);
390
                } while (!*line);    /* skip CR LF from last chunk */
391

    
392
                s->chunksize = strtoll(line, NULL, 16);
393

    
394
                av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
395

    
396
                if (!s->chunksize)
397
                    return 0;
398
                break;
399
            }
400
        }
401
        size = FFMIN(size, s->chunksize);
402
    }
403
    /* read bytes from input buffer first */
404
    len = s->buf_end - s->buf_ptr;
405
    if (len > 0) {
406
        if (len > size)
407
            len = size;
408
        memcpy(buf, s->buf_ptr, len);
409
        s->buf_ptr += len;
410
    } else {
411
        if (!s->willclose && s->filesize >= 0 && s->off >= s->filesize)
412
            return AVERROR_EOF;
413
        len = ffurl_read(s->hd, buf, size);
414
    }
415
    if (len > 0) {
416
        s->off += len;
417
        if (s->chunksize > 0)
418
            s->chunksize -= len;
419
    }
420
    return len;
421
}
422

    
423
/* used only when posting data */
424
static int http_write(URLContext *h, const uint8_t *buf, int size)
425
{
426
    char temp[11] = "";  /* 32-bit hex + CRLF + nul */
427
    int ret;
428
    char crlf[] = "\r\n";
429
    HTTPContext *s = h->priv_data;
430

    
431
    if (s->chunksize == -1) {
432
        /* non-chunked data is sent without any special encoding */
433
        return ffurl_write(s->hd, buf, size);
434
    }
435

    
436
    /* silently ignore zero-size data since chunk encoding that would
437
     * signal EOF */
438
    if (size > 0) {
439
        /* upload data using chunked encoding */
440
        snprintf(temp, sizeof(temp), "%x\r\n", size);
441

    
442
        if ((ret = ffurl_write(s->hd, temp, strlen(temp))) < 0 ||
443
            (ret = ffurl_write(s->hd, buf, size)) < 0 ||
444
            (ret = ffurl_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
445
            return ret;
446
    }
447
    return size;
448
}
449

    
450
static int http_close(URLContext *h)
451
{
452
    int ret = 0;
453
    char footer[] = "0\r\n\r\n";
454
    HTTPContext *s = h->priv_data;
455

    
456
    /* signal end of chunked encoding if used */
457
    if ((h->flags & AVIO_FLAG_WRITE) && s->chunksize != -1) {
458
        ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
459
        ret = ret > 0 ? 0 : ret;
460
    }
461

    
462
    if (s->hd)
463
        ffurl_close(s->hd);
464
    return ret;
465
}
466

    
467
static int64_t http_seek(URLContext *h, int64_t off, int whence)
468
{
469
    HTTPContext *s = h->priv_data;
470
    URLContext *old_hd = s->hd;
471
    int64_t old_off = s->off;
472
    uint8_t old_buf[BUFFER_SIZE];
473
    int old_buf_size;
474

    
475
    if (whence == AVSEEK_SIZE)
476
        return s->filesize;
477
    else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
478
        return -1;
479

    
480
    /* we save the old context in case the seek fails */
481
    old_buf_size = s->buf_end - s->buf_ptr;
482
    memcpy(old_buf, s->buf_ptr, old_buf_size);
483
    s->hd = NULL;
484
    if (whence == SEEK_CUR)
485
        off += s->off;
486
    else if (whence == SEEK_END)
487
        off += s->filesize;
488
    s->off = off;
489

    
490
    /* if it fails, continue on old connection */
491
    if (http_open_cnx(h) < 0) {
492
        memcpy(s->buffer, old_buf, old_buf_size);
493
        s->buf_ptr = s->buffer;
494
        s->buf_end = s->buffer + old_buf_size;
495
        s->hd = old_hd;
496
        s->off = old_off;
497
        return -1;
498
    }
499
    ffurl_close(old_hd);
500
    return off;
501
}
502

    
503
static int
504
http_get_file_handle(URLContext *h)
505
{
506
    HTTPContext *s = h->priv_data;
507
    return ffurl_get_file_handle(s->hd);
508
}
509

    
510
URLProtocol ff_http_protocol = {
511
    .name                = "http",
512
    .url_open            = http_open,
513
    .url_read            = http_read,
514
    .url_write           = http_write,
515
    .url_seek            = http_seek,
516
    .url_close           = http_close,
517
    .url_get_file_handle = http_get_file_handle,
518
    .priv_data_size      = sizeof(HTTPContext),
519
    .priv_data_class     = &httpcontext_class,
520
};