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ffmpeg / libavformat / http.c @ f3bfe388

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1
/*
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 * HTTP protocol for ffmpeg client
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 * Copyright (c) 2000, 2001 Fabrice Bellard
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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

    
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#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 "libavcodec/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 */
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#define BUFFER_SIZE 1024
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#define URL_SIZE    4096
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#define MAX_REDIRECTS 8
40

    
41
typedef struct {
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    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[URL_SIZE];
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    HTTPAuthState auth_state;
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    unsigned char headers[BUFFER_SIZE];
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} HTTPContext;
53

    
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#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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    "HTTP", av_default_item_name, options, LIBAVUTIL_VERSION_INT
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};
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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(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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}
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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)
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{
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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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}
87

    
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/* return non zero if error */
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static int http_open_cnx(URLContext *h)
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{
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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;
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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);
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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);
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    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 {
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        if (path1[0] == '\0')
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            path = "/";
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        else
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            path = path1;
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    }
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    if (port < 0)
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        port = 80;
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    ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
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    err = url_open(&hd, buf, URL_RDWR);
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    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;
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    if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
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        goto fail;
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    if (s->http_code == 401) {
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        if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
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            url_close(hd);
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            goto redo;
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        } else
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            goto fail;
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    }
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    if ((s->http_code == 302 || s->http_code == 303) && 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;
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        goto redo;
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    }
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    return 0;
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 fail:
151
    if (hd)
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        url_close(hd);
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    s->hd = NULL;
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    return AVERROR(EIO);
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}
156

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

    
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    h->is_streamed = 1;
162

    
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    s->filesize = -1;
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    av_strlcpy(s->location, uri, URL_SIZE);
165

    
166
    return http_open_cnx(h);
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}
168
static int http_getc(HTTPContext *s)
169
{
170
    int len;
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    if (s->buf_ptr >= s->buf_end) {
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        len = url_read(s->hd, s->buffer, BUFFER_SIZE);
173
        if (len < 0) {
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            return AVERROR(EIO);
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        } else if (len == 0) {
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            return -1;
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        } else {
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            s->buf_ptr = s->buffer;
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            s->buf_end = s->buffer + len;
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        }
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    }
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    return *s->buf_ptr++;
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}
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static int http_get_line(HTTPContext *s, char *line, int line_size)
186
{
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    int ch;
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    char *q;
189

    
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    q = line;
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    for(;;) {
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        ch = http_getc(s);
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        if (ch < 0)
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            return AVERROR(EIO);
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        if (ch == '\n') {
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            /* process line */
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            if (q > line && q[-1] == '\r')
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                q--;
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            *q = '\0';
200

    
201
            return 0;
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        } else {
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            if ((q - line) < line_size - 1)
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                *q++ = ch;
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        }
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    }
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}
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static int process_line(URLContext *h, char *line, int line_count,
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                        int *new_location)
211
{
212
    HTTPContext *s = h->priv_data;
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    char *tag, *p;
214

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

    
219
    p = line;
220
    if (line_count == 0) {
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        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, NULL, 10);
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        dprintf(NULL, "http_code=%d\n", s->http_code);
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        /* 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)
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            return -1;
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    } else {
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        while (*p != '\0' && *p != ':')
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            p++;
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        if (*p != ':')
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            return 1;
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        *p = '\0';
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        tag = line;
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        p++;
242
        while (isspace(*p))
243
            p++;
244
        if (!strcmp(tag, "Location")) {
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            strcpy(s->location, p);
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            *new_location = 1;
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        } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
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            s->filesize = atoll(p);
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        } else if (!strcmp (tag, "Content-Range")) {
250
            /* "bytes $from-$to/$document_size" */
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            const char *slash;
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            if (!strncmp (p, "bytes ", 6)) {
253
                p += 6;
254
                s->off = atoll(p);
255
                if ((slash = strchr(p, '/')) && strlen(slash) > 0)
256
                    s->filesize = atoll(slash+1);
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            }
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            h->is_streamed = 0; /* we _can_ in fact seek */
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        } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
260
            s->filesize = -1;
261
            s->chunksize = 0;
262
        } else if (!strcmp (tag, "WWW-Authenticate")) {
263
            ff_http_auth_handle_header(&s->auth_state, tag, p);
264
        } else if (!strcmp (tag, "Authentication-Info")) {
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            ff_http_auth_handle_header(&s->auth_state, tag, p);
266
        }
267
    }
268
    return 1;
269
}
270

    
271
static inline int has_header(const char *str, const char *header)
272
{
273
    /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
274
    return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
275
}
276

    
277
static int http_connect(URLContext *h, const char *path, const char *hoststr,
278
                        const char *auth, int *new_location)
279
{
280
    HTTPContext *s = h->priv_data;
281
    int post, err;
282
    char line[1024];
283
    char headers[1024] = "";
284
    char *authstr = NULL;
285
    int64_t off = s->off;
286
    int len = 0;
287

    
288

    
289
    /* send http header */
290
    post = h->flags & URL_WRONLY;
291
    authstr = ff_http_auth_create_response(&s->auth_state, auth, path,
292
                                        post ? "POST" : "GET");
293

    
294
    /* set default headers if needed */
295
    if (!has_header(s->headers, "\r\nUser-Agent: "))
296
       len += av_strlcatf(headers + len, sizeof(headers) - len,
297
                          "User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
298
    if (!has_header(s->headers, "\r\nAccept: "))
299
        len += av_strlcpy(headers + len, "Accept: */*\r\n",
300
                          sizeof(headers) - len);
301
    if (!has_header(s->headers, "\r\nRange: "))
302
        len += av_strlcatf(headers + len, sizeof(headers) - len,
303
                           "Range: bytes=%"PRId64"-\r\n", s->off);
304
    if (!has_header(s->headers, "\r\nConnection: "))
305
        len += av_strlcpy(headers + len, "Connection: close\r\n",
306
                          sizeof(headers)-len);
307
    if (!has_header(s->headers, "\r\nHost: "))
308
        len += av_strlcatf(headers + len, sizeof(headers) - len,
309
                           "Host: %s\r\n", hoststr);
310

    
311
    /* now add in custom headers */
312
    av_strlcpy(headers+len, s->headers, sizeof(headers)-len);
313

    
314
    snprintf(s->buffer, sizeof(s->buffer),
315
             "%s %s HTTP/1.1\r\n"
316
             "%s"
317
             "%s"
318
             "%s"
319
             "\r\n",
320
             post ? "POST" : "GET",
321
             path,
322
             post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "",
323
             headers,
324
             authstr ? authstr : "");
325

    
326
    av_freep(&authstr);
327
    if (url_write(s->hd, s->buffer, strlen(s->buffer)) < 0)
328
        return AVERROR(EIO);
329

    
330
    /* init input buffer */
331
    s->buf_ptr = s->buffer;
332
    s->buf_end = s->buffer;
333
    s->line_count = 0;
334
    s->off = 0;
335
    s->filesize = -1;
336
    if (post) {
337
        /* Pretend that it did work. We didn't read any header yet, since
338
         * we've still to send the POST data, but the code calling this
339
         * function will check http_code after we return. */
340
        s->http_code = 200;
341
        return 0;
342
    }
343
    s->chunksize = -1;
344

    
345
    /* wait for header */
346
    for(;;) {
347
        if (http_get_line(s, line, sizeof(line)) < 0)
348
            return AVERROR(EIO);
349

    
350
        dprintf(NULL, "header='%s'\n", line);
351

    
352
        err = process_line(h, line, s->line_count, new_location);
353
        if (err < 0)
354
            return err;
355
        if (err == 0)
356
            break;
357
        s->line_count++;
358
    }
359

    
360
    return (off == s->off) ? 0 : -1;
361
}
362

    
363

    
364
static int http_read(URLContext *h, uint8_t *buf, int size)
365
{
366
    HTTPContext *s = h->priv_data;
367
    int len;
368

    
369
    if (s->chunksize >= 0) {
370
        if (!s->chunksize) {
371
            char line[32];
372

    
373
            for(;;) {
374
                do {
375
                    if (http_get_line(s, line, sizeof(line)) < 0)
376
                        return AVERROR(EIO);
377
                } while (!*line);    /* skip CR LF from last chunk */
378

    
379
                s->chunksize = strtoll(line, NULL, 16);
380

    
381
                dprintf(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
382

    
383
                if (!s->chunksize)
384
                    return 0;
385
                break;
386
            }
387
        }
388
        size = FFMIN(size, s->chunksize);
389
    }
390
    /* read bytes from input buffer first */
391
    len = s->buf_end - s->buf_ptr;
392
    if (len > 0) {
393
        if (len > size)
394
            len = size;
395
        memcpy(buf, s->buf_ptr, len);
396
        s->buf_ptr += len;
397
    } else {
398
        len = url_read(s->hd, buf, size);
399
    }
400
    if (len > 0) {
401
        s->off += len;
402
        if (s->chunksize > 0)
403
            s->chunksize -= len;
404
    }
405
    return len;
406
}
407

    
408
/* used only when posting data */
409
static int http_write(URLContext *h, const uint8_t *buf, int size)
410
{
411
    char temp[11] = "";  /* 32-bit hex + CRLF + nul */
412
    int ret;
413
    char crlf[] = "\r\n";
414
    HTTPContext *s = h->priv_data;
415

    
416
    if (s->chunksize == -1) {
417
        /* non-chunked data is sent without any special encoding */
418
        return url_write(s->hd, buf, size);
419
    }
420

    
421
    /* silently ignore zero-size data since chunk encoding that would
422
     * signal EOF */
423
    if (size > 0) {
424
        /* upload data using chunked encoding */
425
        snprintf(temp, sizeof(temp), "%x\r\n", size);
426

    
427
        if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 ||
428
            (ret = url_write(s->hd, buf, size)) < 0 ||
429
            (ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
430
            return ret;
431
    }
432
    return size;
433
}
434

    
435
static int http_close(URLContext *h)
436
{
437
    int ret = 0;
438
    char footer[] = "0\r\n\r\n";
439
    HTTPContext *s = h->priv_data;
440

    
441
    /* signal end of chunked encoding if used */
442
    if ((h->flags & URL_WRONLY) && s->chunksize != -1) {
443
        ret = url_write(s->hd, footer, sizeof(footer) - 1);
444
        ret = ret > 0 ? 0 : ret;
445
    }
446

    
447
    if (s->hd)
448
        url_close(s->hd);
449
    return ret;
450
}
451

    
452
static int64_t http_seek(URLContext *h, int64_t off, int whence)
453
{
454
    HTTPContext *s = h->priv_data;
455
    URLContext *old_hd = s->hd;
456
    int64_t old_off = s->off;
457
    uint8_t old_buf[BUFFER_SIZE];
458
    int old_buf_size;
459

    
460
    if (whence == AVSEEK_SIZE)
461
        return s->filesize;
462
    else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
463
        return -1;
464

    
465
    /* we save the old context in case the seek fails */
466
    old_buf_size = s->buf_end - s->buf_ptr;
467
    memcpy(old_buf, s->buf_ptr, old_buf_size);
468
    s->hd = NULL;
469
    if (whence == SEEK_CUR)
470
        off += s->off;
471
    else if (whence == SEEK_END)
472
        off += s->filesize;
473
    s->off = off;
474

    
475
    /* if it fails, continue on old connection */
476
    if (http_open_cnx(h) < 0) {
477
        memcpy(s->buffer, old_buf, old_buf_size);
478
        s->buf_ptr = s->buffer;
479
        s->buf_end = s->buffer + old_buf_size;
480
        s->hd = old_hd;
481
        s->off = old_off;
482
        return -1;
483
    }
484
    url_close(old_hd);
485
    return off;
486
}
487

    
488
static int
489
http_get_file_handle(URLContext *h)
490
{
491
    HTTPContext *s = h->priv_data;
492
    return url_get_file_handle(s->hd);
493
}
494

    
495
URLProtocol http_protocol = {
496
    "http",
497
    http_open,
498
    http_read,
499
    http_write,
500
    http_seek,
501
    http_close,
502
    .url_get_file_handle = http_get_file_handle,
503
    .priv_data_size = sizeof(HTTPContext),
504
    .priv_data_class = &httpcontext_class,
505
};