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FFmpeg/libavformat/http.c
Limin Wang 3b8b6d837e avformat/http: Fix for invalid use of av_strtok 
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
2020-05-10 22:32:34 +08:00

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/*
* HTTP protocol for ffmpeg client
* Copyright (c) 2000, 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif /* CONFIG_ZLIB */
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavutil/parseutils.h"
#include "avformat.h"
#include "http.h"
#include "httpauth.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
/* XXX: POST protocol is not completely implemented because ffmpeg uses
* only a subset of it. */
/* The IO buffer size is unrelated to the max URL size in itself, but needs
* to be large enough to fit the full request headers (including long
* path names). */
#define BUFFER_SIZE MAX_URL_SIZE
#define MAX_REDIRECTS 8
#define HTTP_SINGLE 1
#define HTTP_MUTLI 2
#define MAX_EXPIRY 19
#define WHITESPACES " \n\t\r"
typedef enum {
LOWER_PROTO,
READ_HEADERS,
WRITE_REPLY_HEADERS,
FINISH
}HandshakeState;
typedef struct HTTPContext {
const AVClass *class;
URLContext *hd;
unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
int line_count;
int http_code;
/* Used if "Transfer-Encoding: chunked" otherwise -1. */
uint64_t chunksize;
int chunkend;
uint64_t off, end_off, filesize;
char *location;
HTTPAuthState auth_state;
HTTPAuthState proxy_auth_state;
char *http_proxy;
char *headers;
char *mime_type;
char *http_version;
char *user_agent;
char *referer;
#if FF_API_HTTP_USER_AGENT
char *user_agent_deprecated;
#endif
char *content_type;
/* Set if the server correctly handles Connection: close and will close
* the connection after feeding us the content. */
int willclose;
int seekable; /**< Control seekability, 0 = disable, 1 = enable, -1 = probe. */
int chunked_post;
/* A flag which indicates if the end of chunked encoding has been sent. */
int end_chunked_post;
/* A flag which indicates we have finished to read POST reply. */
int end_header;
/* A flag which indicates if we use persistent connections. */
int multiple_requests;
uint8_t *post_data;
int post_datalen;
int is_akamai;
int is_mediagateway;
char *cookies; ///< holds newline (\n) delimited Set-Cookie header field values (without the "Set-Cookie: " field name)
/* A dictionary containing cookies keyed by cookie name */
AVDictionary *cookie_dict;
int icy;
/* how much data was read since the last ICY metadata packet */
uint64_t icy_data_read;
/* after how many bytes of read data a new metadata packet will be found */
uint64_t icy_metaint;
char *icy_metadata_headers;
char *icy_metadata_packet;
AVDictionary *metadata;
#if CONFIG_ZLIB
int compressed;
z_stream inflate_stream;
uint8_t *inflate_buffer;
#endif /* CONFIG_ZLIB */
AVDictionary *chained_options;
/* -1 = try to send if applicable, 0 = always disabled, 1 = always enabled */
int send_expect_100;
char *method;
int reconnect;
int reconnect_at_eof;
int reconnect_streamed;
int reconnect_delay_max;
int listen;
char *resource;
int reply_code;
int is_multi_client;
HandshakeState handshake_step;
int is_connected_server;
} HTTPContext;
#define OFFSET(x) offsetof(HTTPContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
#define DEFAULT_USER_AGENT "Lavf/" AV_STRINGIFY(LIBAVFORMAT_VERSION)
static const AVOption options[] = {
{ "seekable", "control seekability of connection", OFFSET(seekable), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, D },
{ "chunked_post", "use chunked transfer-encoding for posts", OFFSET(chunked_post), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
{ "http_proxy", "set HTTP proxy to tunnel through", OFFSET(http_proxy), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D | E },
{ "headers", "set custom HTTP headers, can override built in default headers", OFFSET(headers), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D | E },
{ "content_type", "set a specific content type for the POST messages", OFFSET(content_type), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D | E },
{ "user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, { .str = DEFAULT_USER_AGENT }, 0, 0, D },
{ "referer", "override referer header", OFFSET(referer), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
#if FF_API_HTTP_USER_AGENT
{ "user-agent", "use the \"user_agent\" option instead", OFFSET(user_agent_deprecated), AV_OPT_TYPE_STRING, { .str = DEFAULT_USER_AGENT }, 0, 0, D|AV_OPT_FLAG_DEPRECATED },
#endif
{ "multiple_requests", "use persistent connections", OFFSET(multiple_requests), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, D | E },
{ "post_data", "set custom HTTP post data", OFFSET(post_data), AV_OPT_TYPE_BINARY, .flags = D | E },
{ "mime_type", "export the MIME type", OFFSET(mime_type), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
{ "http_version", "export the http response version", OFFSET(http_version), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
{ "cookies", "set cookies to be sent in applicable future requests, use newline delimited Set-Cookie HTTP field value syntax", OFFSET(cookies), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
{ "icy", "request ICY metadata", OFFSET(icy), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, D },
{ "icy_metadata_headers", "return ICY metadata headers", OFFSET(icy_metadata_headers), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_EXPORT },
{ "icy_metadata_packet", "return current ICY metadata packet", OFFSET(icy_metadata_packet), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_EXPORT },
{ "metadata", "metadata read from the bitstream", OFFSET(metadata), AV_OPT_TYPE_DICT, {0}, 0, 0, AV_OPT_FLAG_EXPORT },
{ "auth_type", "HTTP authentication type", OFFSET(auth_state.auth_type), AV_OPT_TYPE_INT, { .i64 = HTTP_AUTH_NONE }, HTTP_AUTH_NONE, HTTP_AUTH_BASIC, D | E, "auth_type"},
{ "none", "No auth method set, autodetect", 0, AV_OPT_TYPE_CONST, { .i64 = HTTP_AUTH_NONE }, 0, 0, D | E, "auth_type"},
{ "basic", "HTTP basic authentication", 0, AV_OPT_TYPE_CONST, { .i64 = HTTP_AUTH_BASIC }, 0, 0, D | E, "auth_type"},
{ "send_expect_100", "Force sending an Expect: 100-continue header for POST", OFFSET(send_expect_100), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, E },
{ "location", "The actual location of the data received", OFFSET(location), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D | E },
{ "offset", "initial byte offset", OFFSET(off), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, D },
{ "end_offset", "try to limit the request to bytes preceding this offset", OFFSET(end_off), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, D },
{ "method", "Override the HTTP method or set the expected HTTP method from a client", OFFSET(method), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D | E },
{ "reconnect", "auto reconnect after disconnect before EOF", OFFSET(reconnect), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, D },
{ "reconnect_at_eof", "auto reconnect at EOF", OFFSET(reconnect_at_eof), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, D },
{ "reconnect_streamed", "auto reconnect streamed / non seekable streams", OFFSET(reconnect_streamed), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, D },
{ "reconnect_delay_max", "max reconnect delay in seconds after which to give up", OFFSET(reconnect_delay_max), AV_OPT_TYPE_INT, { .i64 = 120 }, 0, UINT_MAX/1000/1000, D },
{ "listen", "listen on HTTP", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, D | E },
{ "resource", "The resource requested by a client", OFFSET(resource), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
{ "reply_code", "The http status code to return to a client", OFFSET(reply_code), AV_OPT_TYPE_INT, { .i64 = 200}, INT_MIN, 599, E},
{ NULL }
};
static int http_connect(URLContext *h, const char *path, const char *local_path,
const char *hoststr, const char *auth,
const char *proxyauth, int *new_location);
static int http_read_header(URLContext *h, int *new_location);
static int http_shutdown(URLContext *h, int flags);
void ff_http_init_auth_state(URLContext *dest, const URLContext *src)
{
memcpy(&((HTTPContext *)dest->priv_data)->auth_state,
&((HTTPContext *)src->priv_data)->auth_state,
sizeof(HTTPAuthState));
memcpy(&((HTTPContext *)dest->priv_data)->proxy_auth_state,
&((HTTPContext *)src->priv_data)->proxy_auth_state,
sizeof(HTTPAuthState));
}
static int http_open_cnx_internal(URLContext *h, AVDictionary **options)
{
const char *path, *proxy_path, *lower_proto = "tcp", *local_path;
char *hashmark;
char hostname[1024], hoststr[1024], proto[10];
char auth[1024], proxyauth[1024] = "";
char path1[MAX_URL_SIZE], sanitized_path[MAX_URL_SIZE];
char buf[1024], urlbuf[MAX_URL_SIZE];
int port, use_proxy, err, location_changed = 0;
HTTPContext *s = h->priv_data;
av_url_split(proto, sizeof(proto), auth, sizeof(auth),
hostname, sizeof(hostname), &port,
path1, sizeof(path1), s->location);
ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
proxy_path = s->http_proxy ? s->http_proxy : getenv("http_proxy");
use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), hostname) &&
proxy_path && av_strstart(proxy_path, "http://", NULL);
if (!strcmp(proto, "https")) {
lower_proto = "tls";
use_proxy = 0;
if (port < 0)
port = 443;
}
if (port < 0)
port = 80;
hashmark = strchr(path1, '#');
if (hashmark)
*hashmark = '\0';
if (path1[0] == '\0') {
path = "/";
} else if (path1[0] == '?') {
snprintf(sanitized_path, sizeof(sanitized_path), "/%s", path1);
path = sanitized_path;
} else {
path = path1;
}
local_path = path;
if (use_proxy) {
/* Reassemble the request URL without auth string - we don't
* want to leak the auth to the proxy. */
ff_url_join(urlbuf, sizeof(urlbuf), proto, NULL, hostname, port, "%s",
path1);
path = urlbuf;
av_url_split(NULL, 0, proxyauth, sizeof(proxyauth),
hostname, sizeof(hostname), &port, NULL, 0, proxy_path);
}
ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);
if (!s->hd) {
err = ffurl_open_whitelist(&s->hd, buf, AVIO_FLAG_READ_WRITE,
&h->interrupt_callback, options,
h->protocol_whitelist, h->protocol_blacklist, h);
if (err < 0)
return err;
}
err = http_connect(h, path, local_path, hoststr,
auth, proxyauth, &location_changed);
if (err < 0)
return err;
return location_changed;
}
/* return non zero if error */
static int http_open_cnx(URLContext *h, AVDictionary **options)
{
HTTPAuthType cur_auth_type, cur_proxy_auth_type;
HTTPContext *s = h->priv_data;
int location_changed, attempts = 0, redirects = 0;
redo:
av_dict_copy(options, s->chained_options, 0);
cur_auth_type = s->auth_state.auth_type;
cur_proxy_auth_type = s->auth_state.auth_type;
location_changed = http_open_cnx_internal(h, options);
if (location_changed < 0)
goto fail;
attempts++;
if (s->http_code == 401) {
if ((cur_auth_type == HTTP_AUTH_NONE || s->auth_state.stale) &&
s->auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
ffurl_closep(&s->hd);
goto redo;
} else
goto fail;
}
if (s->http_code == 407) {
if ((cur_proxy_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
ffurl_closep(&s->hd);
goto redo;
} else
goto fail;
}
if ((s->http_code == 301 || s->http_code == 302 ||
s->http_code == 303 || s->http_code == 307) &&
location_changed == 1) {
/* url moved, get next */
ffurl_closep(&s->hd);
if (redirects++ >= MAX_REDIRECTS)
return AVERROR(EIO);
/* Restart the authentication process with the new target, which
* might use a different auth mechanism. */
memset(&s->auth_state, 0, sizeof(s->auth_state));
attempts = 0;
location_changed = 0;
goto redo;
}
return 0;
fail:
if (s->hd)
ffurl_closep(&s->hd);
if (location_changed < 0)
return location_changed;
return ff_http_averror(s->http_code, AVERROR(EIO));
}
int ff_http_get_shutdown_status(URLContext *h)
{
int ret = 0;
HTTPContext *s = h->priv_data;
/* flush the receive buffer when it is write only mode */
char buf[1024];
int read_ret;
read_ret = ffurl_read(s->hd, buf, sizeof(buf));
if (read_ret < 0) {
ret = read_ret;
}
return ret;
}
int ff_http_do_new_request(URLContext *h, const char *uri) {
return ff_http_do_new_request2(h, uri, NULL);
}
int ff_http_do_new_request2(URLContext *h, const char *uri, AVDictionary **opts)
{
HTTPContext *s = h->priv_data;
AVDictionary *options = NULL;
int ret;
char hostname1[1024], hostname2[1024], proto1[10], proto2[10];
int port1, port2;
if (!h->prot ||
!(!strcmp(h->prot->name, "http") ||
!strcmp(h->prot->name, "https")))
return AVERROR(EINVAL);
av_url_split(proto1, sizeof(proto1), NULL, 0,
hostname1, sizeof(hostname1), &port1,
NULL, 0, s->location);
av_url_split(proto2, sizeof(proto2), NULL, 0,
hostname2, sizeof(hostname2), &port2,
NULL, 0, uri);
if (port1 != port2 || strncmp(hostname1, hostname2, sizeof(hostname2)) != 0) {
av_log(h, AV_LOG_ERROR, "Cannot reuse HTTP connection for different host: %s:%d != %s:%d\n",
hostname1, port1,
hostname2, port2
);
return AVERROR(EINVAL);
}
if (!s->end_chunked_post) {
ret = http_shutdown(h, h->flags);
if (ret < 0)
return ret;
}
if (s->willclose)
return AVERROR_EOF;
s->end_chunked_post = 0;
s->chunkend = 0;
s->off = 0;
s->icy_data_read = 0;
av_free(s->location);
s->location = av_strdup(uri);
if (!s->location)
return AVERROR(ENOMEM);
if ((ret = av_opt_set_dict(s, opts)) < 0)
return ret;
av_log(s, AV_LOG_INFO, "Opening \'%s\' for %s\n", uri, h->flags & AVIO_FLAG_WRITE ? "writing" : "reading");
ret = http_open_cnx(h, &options);
av_dict_free(&options);
return ret;
}
int ff_http_averror(int status_code, int default_averror)
{
switch (status_code) {
case 400: return AVERROR_HTTP_BAD_REQUEST;
case 401: return AVERROR_HTTP_UNAUTHORIZED;
case 403: return AVERROR_HTTP_FORBIDDEN;
case 404: return AVERROR_HTTP_NOT_FOUND;
default: break;
}
if (status_code >= 400 && status_code <= 499)
return AVERROR_HTTP_OTHER_4XX;
else if (status_code >= 500)
return AVERROR_HTTP_SERVER_ERROR;
else
return default_averror;
}
static int http_write_reply(URLContext* h, int status_code)
{
int ret, body = 0, reply_code, message_len;
const char *reply_text, *content_type;
HTTPContext *s = h->priv_data;
char message[BUFFER_SIZE];
content_type = "text/plain";
if (status_code < 0)
body = 1;
switch (status_code) {
case AVERROR_HTTP_BAD_REQUEST:
case 400:
reply_code = 400;
reply_text = "Bad Request";
break;
case AVERROR_HTTP_FORBIDDEN:
case 403:
reply_code = 403;
reply_text = "Forbidden";
break;
case AVERROR_HTTP_NOT_FOUND:
case 404:
reply_code = 404;
reply_text = "Not Found";
break;
case 200:
reply_code = 200;
reply_text = "OK";
content_type = s->content_type ? s->content_type : "application/octet-stream";
break;
case AVERROR_HTTP_SERVER_ERROR:
case 500:
reply_code = 500;
reply_text = "Internal server error";
break;
default:
return AVERROR(EINVAL);
}
if (body) {
s->chunked_post = 0;
message_len = snprintf(message, sizeof(message),
"HTTP/1.1 %03d %s\r\n"
"Content-Type: %s\r\n"
"Content-Length: %"SIZE_SPECIFIER"\r\n"
"%s"
"\r\n"
"%03d %s\r\n",
reply_code,
reply_text,
content_type,
strlen(reply_text) + 6, // 3 digit status code + space + \r\n
s->headers ? s->headers : "",
reply_code,
reply_text);
} else {
s->chunked_post = 1;
message_len = snprintf(message, sizeof(message),
"HTTP/1.1 %03d %s\r\n"
"Content-Type: %s\r\n"
"Transfer-Encoding: chunked\r\n"
"%s"
"\r\n",
reply_code,
reply_text,
content_type,
s->headers ? s->headers : "");
}
av_log(h, AV_LOG_TRACE, "HTTP reply header: \n%s----\n", message);
if ((ret = ffurl_write(s->hd, message, message_len)) < 0)
return ret;
return 0;
}
static void handle_http_errors(URLContext *h, int error)
{
av_assert0(error < 0);
http_write_reply(h, error);
}
static int http_handshake(URLContext *c)
{
int ret, err, new_location;
HTTPContext *ch = c->priv_data;
URLContext *cl = ch->hd;
switch (ch->handshake_step) {
case LOWER_PROTO:
av_log(c, AV_LOG_TRACE, "Lower protocol\n");
if ((ret = ffurl_handshake(cl)) > 0)
return 2 + ret;
if (ret < 0)
return ret;
ch->handshake_step = READ_HEADERS;
ch->is_connected_server = 1;
return 2;
case READ_HEADERS:
av_log(c, AV_LOG_TRACE, "Read headers\n");
if ((err = http_read_header(c, &new_location)) < 0) {
handle_http_errors(c, err);
return err;
}
ch->handshake_step = WRITE_REPLY_HEADERS;
return 1;
case WRITE_REPLY_HEADERS:
av_log(c, AV_LOG_TRACE, "Reply code: %d\n", ch->reply_code);
if ((err = http_write_reply(c, ch->reply_code)) < 0)
return err;
ch->handshake_step = FINISH;
return 1;
case FINISH:
return 0;
}
// this should never be reached.
return AVERROR(EINVAL);
}
static int http_listen(URLContext *h, const char *uri, int flags,
AVDictionary **options) {
HTTPContext *s = h->priv_data;
int ret;
char hostname[1024], proto[10];
char lower_url[100];
const char *lower_proto = "tcp";
int port;
av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port,
NULL, 0, uri);
if (!strcmp(proto, "https"))
lower_proto = "tls";
ff_url_join(lower_url, sizeof(lower_url), lower_proto, NULL, hostname, port,
NULL);
if ((ret = av_dict_set_int(options, "listen", s->listen, 0)) < 0)
goto fail;
if ((ret = ffurl_open_whitelist(&s->hd, lower_url, AVIO_FLAG_READ_WRITE,
&h->interrupt_callback, options,
h->protocol_whitelist, h->protocol_blacklist, h
)) < 0)
goto fail;
s->handshake_step = LOWER_PROTO;
if (s->listen == HTTP_SINGLE) { /* single client */
s->reply_code = 200;
while ((ret = http_handshake(h)) > 0);
}
fail:
av_dict_free(&s->chained_options);
return ret;
}
static int http_open(URLContext *h, const char *uri, int flags,
AVDictionary **options)
{
HTTPContext *s = h->priv_data;
int ret;
if( s->seekable == 1 )
h->is_streamed = 0;
else
h->is_streamed = 1;
s->filesize = UINT64_MAX;
s->location = av_strdup(uri);
if (!s->location)
return AVERROR(ENOMEM);
if (options)
av_dict_copy(&s->chained_options, *options, 0);
if (s->headers) {
int len = strlen(s->headers);
if (len < 2 || strcmp("\r\n", s->headers + len - 2)) {
av_log(h, AV_LOG_WARNING,
"No trailing CRLF found in HTTP header. Adding it.\n");
ret = av_reallocp(&s->headers, len + 3);
if (ret < 0)
return ret;
s->headers[len] = '\r';
s->headers[len + 1] = '\n';
s->headers[len + 2] = '\0';
}
}
if (s->listen) {
return http_listen(h, uri, flags, options);
}
ret = http_open_cnx(h, options);
if (ret < 0)
av_dict_free(&s->chained_options);
return ret;
}
static int http_accept(URLContext *s, URLContext **c)
{
int ret;
HTTPContext *sc = s->priv_data;
HTTPContext *cc;
URLContext *sl = sc->hd;
URLContext *cl = NULL;
av_assert0(sc->listen);
if ((ret = ffurl_alloc(c, s->filename, s->flags, &sl->interrupt_callback)) < 0)
goto fail;
cc = (*c)->priv_data;
if ((ret = ffurl_accept(sl, &cl)) < 0)
goto fail;
cc->hd = cl;
cc->is_multi_client = 1;
return 0;
fail:
if (c) {
ffurl_closep(c);
}
return ret;
}
static int http_getc(HTTPContext *s)
{
int len;
if (s->buf_ptr >= s->buf_end) {
len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE);
if (len < 0) {
return len;
} else if (len == 0) {
return AVERROR_EOF;
} else {
s->buf_ptr = s->buffer;
s->buf_end = s->buffer + len;
}
}
return *s->buf_ptr++;
}
static int http_get_line(HTTPContext *s, char *line, int line_size)
{
int ch;
char *q;
q = line;
for (;;) {
ch = http_getc(s);
if (ch < 0)
return ch;
if (ch == '\n') {
/* process line */
if (q > line && q[-1] == '\r')
q--;
*q = '\0';
return 0;
} else {
if ((q - line) < line_size - 1)
*q++ = ch;
}
}
}
static int check_http_code(URLContext *h, int http_code, const char *end)
{
HTTPContext *s = h->priv_data;
/* error codes are 4xx and 5xx, but regard 401 as a success, so we
* don't abort until all headers have been parsed. */
if (http_code >= 400 && http_code < 600 &&
(http_code != 401 || s->auth_state.auth_type != HTTP_AUTH_NONE) &&
(http_code != 407 || s->proxy_auth_state.auth_type != HTTP_AUTH_NONE)) {
end += strspn(end, SPACE_CHARS);
av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n", http_code, end);
return ff_http_averror(http_code, AVERROR(EIO));
}
return 0;
}
static int parse_location(HTTPContext *s, const char *p)
{
char redirected_location[MAX_URL_SIZE], *new_loc;
ff_make_absolute_url(redirected_location, sizeof(redirected_location),
s->location, p);
new_loc = av_strdup(redirected_location);
if (!new_loc)
return AVERROR(ENOMEM);
av_free(s->location);
s->location = new_loc;
return 0;
}
/* "bytes $from-$to/$document_size" */
static void parse_content_range(URLContext *h, const char *p)
{
HTTPContext *s = h->priv_data;
const char *slash;
if (!strncmp(p, "bytes ", 6)) {
p += 6;
s->off = strtoull(p, NULL, 10);
if ((slash = strchr(p, '/')) && strlen(slash) > 0)
s->filesize = strtoull(slash + 1, NULL, 10);
}
if (s->seekable == -1 && (!s->is_akamai || s->filesize != 2147483647))
h->is_streamed = 0; /* we _can_ in fact seek */
}
static int parse_content_encoding(URLContext *h, const char *p)
{
if (!av_strncasecmp(p, "gzip", 4) ||
!av_strncasecmp(p, "deflate", 7)) {
#if CONFIG_ZLIB
HTTPContext *s = h->priv_data;
s->compressed = 1;
inflateEnd(&s->inflate_stream);
if (inflateInit2(&s->inflate_stream, 32 + 15) != Z_OK) {
av_log(h, AV_LOG_WARNING, "Error during zlib initialisation: %s\n",
s->inflate_stream.msg);
return AVERROR(ENOSYS);
}
if (zlibCompileFlags() & (1 << 17)) {
av_log(h, AV_LOG_WARNING,
"Your zlib was compiled without gzip support.\n");
return AVERROR(ENOSYS);
}
#else
av_log(h, AV_LOG_WARNING,
"Compressed (%s) content, need zlib with gzip support\n", p);
return AVERROR(ENOSYS);
#endif /* CONFIG_ZLIB */
} else if (!av_strncasecmp(p, "identity", 8)) {
// The normal, no-encoding case (although servers shouldn't include
// the header at all if this is the case).
} else {
av_log(h, AV_LOG_WARNING, "Unknown content coding: %s\n", p);
}
return 0;
}
// Concat all Icy- header lines
static int parse_icy(HTTPContext *s, const char *tag, const char *p)
{
int len = 4 + strlen(p) + strlen(tag);
int is_first = !s->icy_metadata_headers;
int ret;
av_dict_set(&s->metadata, tag, p, 0);
if (s->icy_metadata_headers)
len += strlen(s->icy_metadata_headers);
if ((ret = av_reallocp(&s->icy_metadata_headers, len)) < 0)
return ret;
if (is_first)
*s->icy_metadata_headers = '\0';
av_strlcatf(s->icy_metadata_headers, len, "%s: %s\n", tag, p);
return 0;
}
static int parse_set_cookie_expiry_time(const char *exp_str, struct tm *buf)
{
char exp_buf[MAX_EXPIRY];
int i, j, exp_buf_len = MAX_EXPIRY-1;
char *expiry;
// strip off any punctuation or whitespace
for (i = 0, j = 0; exp_str[i] != '\0' && j < exp_buf_len; i++) {
if ((exp_str[i] >= '0' && exp_str[i] <= '9') ||
(exp_str[i] >= 'A' && exp_str[i] <= 'Z') ||
(exp_str[i] >= 'a' && exp_str[i] <= 'z')) {
exp_buf[j] = exp_str[i];
j++;
}
}
exp_buf[j] = '\0';
expiry = exp_buf;
// move the string beyond the day of week
while ((*expiry < '0' || *expiry > '9') && *expiry != '\0')
expiry++;
return av_small_strptime(expiry, "%d%b%Y%H%M%S", buf) ? 0 : AVERROR(EINVAL);
}
static int parse_set_cookie(const char *set_cookie, AVDictionary **dict)
{
char *param, *next_param, *cstr, *back;
char *saveptr = NULL;
if (!set_cookie[0])
return 0;
if (!(cstr = av_strdup(set_cookie)))
return AVERROR(EINVAL);
// strip any trailing whitespace
back = &cstr[strlen(cstr)-1];
while (strchr(WHITESPACES, *back)) {
*back='\0';
if (back == cstr)
break;
back--;
}
next_param = cstr;
while ((param = av_strtok(next_param, ";", &saveptr))) {
char *name, *value;
next_param = NULL;
param += strspn(param, WHITESPACES);
if ((name = av_strtok(param, "=", &value))) {
if (av_dict_set(dict, name, value, 0) < 0) {
av_free(cstr);
return -1;
}
}
}
av_free(cstr);
return 0;
}
static int parse_cookie(HTTPContext *s, const char *p, AVDictionary **cookies)
{
AVDictionary *new_params = NULL;
AVDictionaryEntry *e, *cookie_entry;
char *eql, *name;
// ensure the cookie is parsable
if (parse_set_cookie(p, &new_params))
return -1;
// if there is no cookie value there is nothing to parse
cookie_entry = av_dict_get(new_params, "", NULL, AV_DICT_IGNORE_SUFFIX);
if (!cookie_entry || !cookie_entry->value) {
av_dict_free(&new_params);
return -1;
}
// ensure the cookie is not expired or older than an existing value
if ((e = av_dict_get(new_params, "expires", NULL, 0)) && e->value) {
struct tm new_tm = {0};
if (!parse_set_cookie_expiry_time(e->value, &new_tm)) {
AVDictionaryEntry *e2;
// if the cookie has already expired ignore it
if (av_timegm(&new_tm) < av_gettime() / 1000000) {
av_dict_free(&new_params);
return 0;
}
// only replace an older cookie with the same name
e2 = av_dict_get(*cookies, cookie_entry->key, NULL, 0);
if (e2 && e2->value) {
AVDictionary *old_params = NULL;
if (!parse_set_cookie(p, &old_params)) {
e2 = av_dict_get(old_params, "expires", NULL, 0);
if (e2 && e2->value) {
struct tm old_tm = {0};
if (!parse_set_cookie_expiry_time(e->value, &old_tm)) {
if (av_timegm(&new_tm) < av_timegm(&old_tm)) {
av_dict_free(&new_params);
av_dict_free(&old_params);
return -1;
}
}
}
}
av_dict_free(&old_params);
}
}
}
av_dict_free(&new_params);
// duplicate the cookie name (dict will dupe the value)
if (!(eql = strchr(p, '='))) return AVERROR(EINVAL);
if (!(name = av_strndup(p, eql - p))) return AVERROR(ENOMEM);
// add the cookie to the dictionary
av_dict_set(cookies, name, eql, AV_DICT_DONT_STRDUP_KEY);
return 0;
}
static int cookie_string(AVDictionary *dict, char **cookies)
{
AVDictionaryEntry *e = NULL;
int len = 1;
// determine how much memory is needed for the cookies string
while (e = av_dict_get(dict, "", e, AV_DICT_IGNORE_SUFFIX))
len += strlen(e->key) + strlen(e->value) + 1;
// reallocate the cookies
e = NULL;
if (*cookies) av_free(*cookies);
*cookies = av_malloc(len);
if (!*cookies) return AVERROR(ENOMEM);
*cookies[0] = '\0';
// write out the cookies
while (e = av_dict_get(dict, "", e, AV_DICT_IGNORE_SUFFIX))
av_strlcatf(*cookies, len, "%s%s\n", e->key, e->value);
return 0;
}
static int process_line(URLContext *h, char *line, int line_count,
int *new_location)
{
HTTPContext *s = h->priv_data;
const char *auto_method = h->flags & AVIO_FLAG_READ ? "POST" : "GET";
char *tag, *p, *end, *method, *resource, *version;
int ret;
/* end of header */
if (line[0] == '\0') {
s->end_header = 1;
return 0;
}
p = line;
if (line_count == 0) {
if (s->is_connected_server) {
// HTTP method
method = p;
while (*p && !av_isspace(*p))
p++;
*(p++) = '\0';
av_log(h, AV_LOG_TRACE, "Received method: %s\n", method);
if (s->method) {
if (av_strcasecmp(s->method, method)) {
av_log(h, AV_LOG_ERROR, "Received and expected HTTP method do not match. (%s expected, %s received)\n",
s->method, method);
return ff_http_averror(400, AVERROR(EIO));
}
} else {
// use autodetected HTTP method to expect
av_log(h, AV_LOG_TRACE, "Autodetected %s HTTP method\n", auto_method);
if (av_strcasecmp(auto_method, method)) {
av_log(h, AV_LOG_ERROR, "Received and autodetected HTTP method did not match "
"(%s autodetected %s received)\n", auto_method, method);
return ff_http_averror(400, AVERROR(EIO));
}
if (!(s->method = av_strdup(method)))
return AVERROR(ENOMEM);
}
// HTTP resource
while (av_isspace(*p))
p++;
resource = p;
while (*p && !av_isspace(*p))
p++;
*(p++) = '\0';
av_log(h, AV_LOG_TRACE, "Requested resource: %s\n", resource);
if (!(s->resource = av_strdup(resource)))
return AVERROR(ENOMEM);
// HTTP version
while (av_isspace(*p))
p++;
version = p;
while (*p && !av_isspace(*p))
p++;
*p = '\0';
if (av_strncasecmp(version, "HTTP/", 5)) {
av_log(h, AV_LOG_ERROR, "Malformed HTTP version string.\n");
return ff_http_averror(400, AVERROR(EIO));
}
av_log(h, AV_LOG_TRACE, "HTTP version string: %s\n", version);
} else {
if (av_strncasecmp(p, "HTTP/1.0", 8) == 0)
s->willclose = 1;
while (*p != '/' && *p != '\0')
p++;
while (*p == '/')
p++;
av_freep(&s->http_version);
s->http_version = av_strndup(p, 3);
while (!av_isspace(*p) && *p != '\0')
p++;
while (av_isspace(*p))
p++;
s->http_code = strtol(p, &end, 10);
av_log(h, AV_LOG_TRACE, "http_code=%d\n", s->http_code);
if ((ret = check_http_code(h, s->http_code, end)) < 0)
return ret;
}
} else {
while (*p != '\0' && *p != ':')
p++;
if (*p != ':')
return 1;
*p = '\0';
tag = line;
p++;
while (av_isspace(*p))
p++;
if (!av_strcasecmp(tag, "Location")) {
if ((ret = parse_location(s, p)) < 0)
return ret;
*new_location = 1;
} else if (!av_strcasecmp(tag, "Content-Length") &&
s->filesize == UINT64_MAX) {
s->filesize = strtoull(p, NULL, 10);
} else if (!av_strcasecmp(tag, "Content-Range")) {
parse_content_range(h, p);
} else if (!av_strcasecmp(tag, "Accept-Ranges") &&
!strncmp(p, "bytes", 5) &&
s->seekable == -1) {
h->is_streamed = 0;
} else if (!av_strcasecmp(tag, "Transfer-Encoding") &&
!av_strncasecmp(p, "chunked", 7)) {
s->filesize = UINT64_MAX;
s->chunksize = 0;
} else if (!av_strcasecmp(tag, "WWW-Authenticate")) {
ff_http_auth_handle_header(&s->auth_state, tag, p);
} else if (!av_strcasecmp(tag, "Authentication-Info")) {
ff_http_auth_handle_header(&s->auth_state, tag, p);
} else if (!av_strcasecmp(tag, "Proxy-Authenticate")) {
ff_http_auth_handle_header(&s->proxy_auth_state, tag, p);
} else if (!av_strcasecmp(tag, "Connection")) {
if (!strcmp(p, "close"))
s->willclose = 1;
} else if (!av_strcasecmp(tag, "Server")) {
if (!av_strcasecmp(p, "AkamaiGHost")) {
s->is_akamai = 1;
} else if (!av_strncasecmp(p, "MediaGateway", 12)) {
s->is_mediagateway = 1;
}
} else if (!av_strcasecmp(tag, "Content-Type")) {
av_free(s->mime_type);
s->mime_type = av_strdup(p);
} else if (!av_strcasecmp(tag, "Set-Cookie")) {
if (parse_cookie(s, p, &s->cookie_dict))
av_log(h, AV_LOG_WARNING, "Unable to parse '%s'\n", p);
} else if (!av_strcasecmp(tag, "Icy-MetaInt")) {
s->icy_metaint = strtoull(p, NULL, 10);
} else if (!av_strncasecmp(tag, "Icy-", 4)) {
if ((ret = parse_icy(s, tag, p)) < 0)
return ret;
} else if (!av_strcasecmp(tag, "Content-Encoding")) {
if ((ret = parse_content_encoding(h, p)) < 0)
return ret;
}
}
return 1;
}
/**
* Create a string containing cookie values for use as a HTTP cookie header
* field value for a particular path and domain from the cookie values stored in
* the HTTP protocol context. The cookie string is stored in *cookies, and may
* be NULL if there are no valid cookies.
*
* @return a negative value if an error condition occurred, 0 otherwise
*/
static int get_cookies(HTTPContext *s, char **cookies, const char *path,
const char *domain)
{
// cookie strings will look like Set-Cookie header field values. Multiple
// Set-Cookie fields will result in multiple values delimited by a newline
int ret = 0;
char *cookie, *set_cookies, *next;
char *saveptr = NULL;
// destroy any cookies in the dictionary.
av_dict_free(&s->cookie_dict);
if (!s->cookies)
return 0;
next = set_cookies = av_strdup(s->cookies);
if (!next)
return AVERROR(ENOMEM);
*cookies = NULL;
while ((cookie = av_strtok(next, "\n", &saveptr)) && !ret) {
AVDictionary *cookie_params = NULL;
AVDictionaryEntry *cookie_entry, *e;
next = NULL;
// store the cookie in a dict in case it is updated in the response
if (parse_cookie(s, cookie, &s->cookie_dict))
av_log(s, AV_LOG_WARNING, "Unable to parse '%s'\n", cookie);
// continue on to the next cookie if this one cannot be parsed
if (parse_set_cookie(cookie, &cookie_params))
goto skip_cookie;
// if the cookie has no value, skip it
cookie_entry = av_dict_get(cookie_params, "", NULL, AV_DICT_IGNORE_SUFFIX);
if (!cookie_entry || !cookie_entry->value)
goto skip_cookie;
// if the cookie has expired, don't add it
if ((e = av_dict_get(cookie_params, "expires", NULL, 0)) && e->value) {
struct tm tm_buf = {0};
if (!parse_set_cookie_expiry_time(e->value, &tm_buf)) {
if (av_timegm(&tm_buf) < av_gettime() / 1000000)
goto skip_cookie;
}
}
// if no domain in the cookie assume it appied to this request
if ((e = av_dict_get(cookie_params, "domain", NULL, 0)) && e->value) {
// find the offset comparison is on the min domain (b.com, not a.b.com)
int domain_offset = strlen(domain) - strlen(e->value);
if (domain_offset < 0)
goto skip_cookie;
// match the cookie domain
if (av_strcasecmp(&domain[domain_offset], e->value))
goto skip_cookie;
}
// ensure this cookie matches the path
e = av_dict_get(cookie_params, "path", NULL, 0);
if (!e || av_strncasecmp(path, e->value, strlen(e->value)))
goto skip_cookie;
// cookie parameters match, so copy the value
if (!*cookies) {
*cookies = av_asprintf("%s=%s", cookie_entry->key, cookie_entry->value);
} else {
char *tmp = *cookies;
*cookies = av_asprintf("%s; %s=%s", tmp, cookie_entry->key, cookie_entry->value);
av_free(tmp);
}
if (!*cookies)
ret = AVERROR(ENOMEM);
skip_cookie:
av_dict_free(&cookie_params);
}
av_free(set_cookies);
return ret;
}
static inline int has_header(const char *str, const char *header)
{
/* header + 2 to skip over CRLF prefix. (make sure you have one!) */
if (!str)
return 0;
return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
}
static int http_read_header(URLContext *h, int *new_location)
{
HTTPContext *s = h->priv_data;
char line[MAX_URL_SIZE];
int err = 0;
s->chunksize = UINT64_MAX;
for (;;) {
if ((err = http_get_line(s, line, sizeof(line))) < 0)
return err;
av_log(h, AV_LOG_TRACE, "header='%s'\n", line);
err = process_line(h, line, s->line_count, new_location);
if (err < 0)
return err;
if (err == 0)
break;
s->line_count++;
}
if (s->seekable == -1 && s->is_mediagateway && s->filesize == 2000000000)
h->is_streamed = 1; /* we can in fact _not_ seek */
// add any new cookies into the existing cookie string
cookie_string(s->cookie_dict, &s->cookies);
av_dict_free(&s->cookie_dict);
return err;
}
/**
* Escape unsafe characters in path in order to pass them safely to the HTTP
* request. Insipred by the algorithm in GNU wget:
* - escape "%" characters not followed by two hex digits
* - escape all "unsafe" characters except which are also "reserved"
* - pass through everything else
*/
static void bprint_escaped_path(AVBPrint *bp, const char *path)
{
#define NEEDS_ESCAPE(ch) \
((ch) <= ' ' || (ch) >= '\x7f' || \
(ch) == '"' || (ch) == '%' || (ch) == '<' || (ch) == '>' || (ch) == '\\' || \
(ch) == '^' || (ch) == '`' || (ch) == '{' || (ch) == '}' || (ch) == '|')
while (*path) {
char buf[1024];
char *q = buf;
while (*path && q - buf < sizeof(buf) - 4) {
if (path[0] == '%' && av_isxdigit(path[1]) && av_isxdigit(path[2])) {
*q++ = *path++;
*q++ = *path++;
*q++ = *path++;
} else if (NEEDS_ESCAPE(*path)) {
q += snprintf(q, 4, "%%%02X", (uint8_t)*path++);
} else {
*q++ = *path++;
}
}
av_bprint_append_data(bp, buf, q - buf);
}
}
static int http_connect(URLContext *h, const char *path, const char *local_path,
const char *hoststr, const char *auth,
const char *proxyauth, int *new_location)
{
HTTPContext *s = h->priv_data;
int post, err;
AVBPrint request;
char *authstr = NULL, *proxyauthstr = NULL;
uint64_t off = s->off;
const char *method;
int send_expect_100 = 0;
av_bprint_init_for_buffer(&request, s->buffer, sizeof(s->buffer));
/* send http header */
post = h->flags & AVIO_FLAG_WRITE;
if (s->post_data) {
/* force POST method and disable chunked encoding when
* custom HTTP post data is set */
post = 1;
s->chunked_post = 0;
}
if (s->method)
method = s->method;
else
method = post ? "POST" : "GET";
authstr = ff_http_auth_create_response(&s->auth_state, auth,
local_path, method);
proxyauthstr = ff_http_auth_create_response(&s->proxy_auth_state, proxyauth,
local_path, method);
if (post && !s->post_data) {
if (s->send_expect_100 != -1) {
send_expect_100 = s->send_expect_100;
} else {
send_expect_100 = 0;
/* The user has supplied authentication but we don't know the auth type,
* send Expect: 100-continue to get the 401 response including the
* WWW-Authenticate header, or an 100 continue if no auth actually
* is needed. */
if (auth && *auth &&
s->auth_state.auth_type == HTTP_AUTH_NONE &&
s->http_code != 401)
send_expect_100 = 1;
}
}
#if FF_API_HTTP_USER_AGENT
if (strcmp(s->user_agent_deprecated, DEFAULT_USER_AGENT)) {
s->user_agent = av_strdup(s->user_agent_deprecated);
}
#endif
av_bprintf(&request, "%s ", method);
bprint_escaped_path(&request, path);
av_bprintf(&request, " HTTP/1.1\r\n");
if (post && s->chunked_post)
av_bprintf(&request, "Transfer-Encoding: chunked\r\n");
/* set default headers if needed */
if (!has_header(s->headers, "\r\nUser-Agent: "))
av_bprintf(&request, "User-Agent: %s\r\n", s->user_agent);
if (s->referer) {
/* set default headers if needed */
if (!has_header(s->headers, "\r\nReferer: "))
av_bprintf(&request, "Referer: %s\r\n", s->referer);
}
if (!has_header(s->headers, "\r\nAccept: "))
av_bprintf(&request, "Accept: */*\r\n");
// Note: we send this on purpose even when s->off is 0 when we're probing,
// since it allows us to detect more reliably if a (non-conforming)
// server supports seeking by analysing the reply headers.
if (!has_header(s->headers, "\r\nRange: ") && !post && (s->off > 0 || s->end_off || s->seekable == -1)) {
av_bprintf(&request, "Range: bytes=%"PRIu64"-", s->off);
if (s->end_off)
av_bprintf(&request, "%"PRId64, s->end_off - 1);
av_bprintf(&request, "\r\n");
}
if (send_expect_100 && !has_header(s->headers, "\r\nExpect: "))
av_bprintf(&request, "Expect: 100-continue\r\n");
if (!has_header(s->headers, "\r\nConnection: "))
av_bprintf(&request, "Connection: %s\r\n", s->multiple_requests ? "keep-alive" : "close");
if (!has_header(s->headers, "\r\nHost: "))
av_bprintf(&request, "Host: %s\r\n", hoststr);
if (!has_header(s->headers, "\r\nContent-Length: ") && s->post_data)
av_bprintf(&request, "Content-Length: %d\r\n", s->post_datalen);
if (!has_header(s->headers, "\r\nContent-Type: ") && s->content_type)
av_bprintf(&request, "Content-Type: %s\r\n", s->content_type);
if (!has_header(s->headers, "\r\nCookie: ") && s->cookies) {
char *cookies = NULL;
if (!get_cookies(s, &cookies, path, hoststr) && cookies) {
av_bprintf(&request, "Cookie: %s\r\n", cookies);
av_free(cookies);
}
}
if (!has_header(s->headers, "\r\nIcy-MetaData: ") && s->icy)
av_bprintf(&request, "Icy-MetaData: 1\r\n");
/* now add in custom headers */
if (s->headers)
av_bprintf(&request, "%s", s->headers);
if (authstr)
av_bprintf(&request, "%s", authstr);
if (proxyauthstr)
av_bprintf(&request, "Proxy-%s", proxyauthstr);
av_bprintf(&request, "\r\n");
av_log(h, AV_LOG_DEBUG, "request: %s\n", request.str);
if (!av_bprint_is_complete(&request)) {
av_log(h, AV_LOG_ERROR, "overlong headers\n");
err = AVERROR(EINVAL);
goto done;
}
if ((err = ffurl_write(s->hd, request.str, request.len)) < 0)
goto done;
if (s->post_data)
if ((err = ffurl_write(s->hd, s->post_data, s->post_datalen)) < 0)
goto done;
/* init input buffer */
s->buf_ptr = s->buffer;
s->buf_end = s->buffer;
s->line_count = 0;
s->off = 0;
s->icy_data_read = 0;
s->filesize = UINT64_MAX;
s->willclose = 0;
s->end_chunked_post = 0;
s->end_header = 0;
#if CONFIG_ZLIB
s->compressed = 0;
#endif
if (post && !s->post_data && !send_expect_100) {
/* Pretend that it did work. We didn't read any header yet, since
* we've still to send the POST data, but the code calling this
* function will check http_code after we return. */
s->http_code = 200;
err = 0;
goto done;
}
/* wait for header */
err = http_read_header(h, new_location);
if (err < 0)
goto done;
if (*new_location)
s->off = off;
err = (off == s->off) ? 0 : -1;
done:
av_freep(&authstr);
av_freep(&proxyauthstr);
return err;
}
static int http_buf_read(URLContext *h, uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
int len;
if (s->chunksize != UINT64_MAX) {
if (s->chunkend) {
return AVERROR_EOF;
}
if (!s->chunksize) {
char line[32];
int err;
do {
if ((err = http_get_line(s, line, sizeof(line))) < 0)
return err;
} while (!*line); /* skip CR LF from last chunk */
s->chunksize = strtoull(line, NULL, 16);
av_log(h, AV_LOG_TRACE,
"Chunked encoding data size: %"PRIu64"\n",
s->chunksize);
if (!s->chunksize && s->multiple_requests) {
http_get_line(s, line, sizeof(line)); // read empty chunk
s->chunkend = 1;
return 0;
}
else if (!s->chunksize) {
av_log(h, AV_LOG_DEBUG, "Last chunk received, closing conn\n");
ffurl_closep(&s->hd);
return 0;
}
else if (s->chunksize == UINT64_MAX) {
av_log(h, AV_LOG_ERROR, "Invalid chunk size %"PRIu64"\n",
s->chunksize);
return AVERROR(EINVAL);
}
}
size = FFMIN(size, s->chunksize);
}
/* read bytes from input buffer first */
len = s->buf_end - s->buf_ptr;
if (len > 0) {
if (len > size)
len = size;
memcpy(buf, s->buf_ptr, len);
s->buf_ptr += len;
} else {
uint64_t target_end = s->end_off ? s->end_off : s->filesize;
if ((!s->willclose || s->chunksize == UINT64_MAX) && s->off >= target_end)
return AVERROR_EOF;
len = ffurl_read(s->hd, buf, size);
if (!len && (!s->willclose || s->chunksize == UINT64_MAX) && s->off < target_end) {
av_log(h, AV_LOG_ERROR,
"Stream ends prematurely at %"PRIu64", should be %"PRIu64"\n",
s->off, target_end
);
return AVERROR(EIO);
}
}
if (len > 0) {
s->off += len;
if (s->chunksize > 0 && s->chunksize != UINT64_MAX) {
av_assert0(s->chunksize >= len);
s->chunksize -= len;
}
}
return len;
}
#if CONFIG_ZLIB
#define DECOMPRESS_BUF_SIZE (256 * 1024)
static int http_buf_read_compressed(URLContext *h, uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
int ret;
if (!s->inflate_buffer) {
s->inflate_buffer = av_malloc(DECOMPRESS_BUF_SIZE);
if (!s->inflate_buffer)
return AVERROR(ENOMEM);
}
if (s->inflate_stream.avail_in == 0) {
int read = http_buf_read(h, s->inflate_buffer, DECOMPRESS_BUF_SIZE);
if (read <= 0)
return read;
s->inflate_stream.next_in = s->inflate_buffer;
s->inflate_stream.avail_in = read;
}
s->inflate_stream.avail_out = size;
s->inflate_stream.next_out = buf;
ret = inflate(&s->inflate_stream, Z_SYNC_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END)
av_log(h, AV_LOG_WARNING, "inflate return value: %d, %s\n",
ret, s->inflate_stream.msg);
return size - s->inflate_stream.avail_out;
}
#endif /* CONFIG_ZLIB */
static int64_t http_seek_internal(URLContext *h, int64_t off, int whence, int force_reconnect);
static int http_read_stream(URLContext *h, uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
int err, new_location, read_ret;
int64_t seek_ret;
int reconnect_delay = 0;
if (!s->hd)
return AVERROR_EOF;
if (s->end_chunked_post && !s->end_header) {
err = http_read_header(h, &new_location);
if (err < 0)
return err;
}
#if CONFIG_ZLIB
if (s->compressed)
return http_buf_read_compressed(h, buf, size);
#endif /* CONFIG_ZLIB */
read_ret = http_buf_read(h, buf, size);
while (read_ret < 0) {
uint64_t target = h->is_streamed ? 0 : s->off;
if (read_ret == AVERROR_EXIT)
break;
if (h->is_streamed && !s->reconnect_streamed)
break;
if (!(s->reconnect && s->filesize > 0 && s->off < s->filesize) &&
!(s->reconnect_at_eof && read_ret == AVERROR_EOF))
break;
if (reconnect_delay > s->reconnect_delay_max)
return AVERROR(EIO);
av_log(h, AV_LOG_WARNING, "Will reconnect at %"PRIu64" in %d second(s), error=%s.\n", s->off, reconnect_delay, av_err2str(read_ret));
err = ff_network_sleep_interruptible(1000U*1000*reconnect_delay, &h->interrupt_callback);
if (err != AVERROR(ETIMEDOUT))
return err;
reconnect_delay = 1 + 2*reconnect_delay;
seek_ret = http_seek_internal(h, target, SEEK_SET, 1);
if (seek_ret >= 0 && seek_ret != target) {
av_log(h, AV_LOG_ERROR, "Failed to reconnect at %"PRIu64".\n", target);
return read_ret;
}
read_ret = http_buf_read(h, buf, size);
}
return read_ret;
}
// Like http_read_stream(), but no short reads.
// Assumes partial reads are an error.
static int http_read_stream_all(URLContext *h, uint8_t *buf, int size)
{
int pos = 0;
while (pos < size) {
int len = http_read_stream(h, buf + pos, size - pos);
if (len < 0)
return len;
pos += len;
}
return pos;
}
static void update_metadata(URLContext *h, char *data)
{
char *key;
char *val;
char *end;
char *next = data;
HTTPContext *s = h->priv_data;
while (*next) {
key = next;
val = strstr(key, "='");
if (!val)
break;
end = strstr(val, "';");
if (!end)
break;
*val = '\0';
*end = '\0';
val += 2;
av_dict_set(&s->metadata, key, val, 0);
av_log(h, AV_LOG_VERBOSE, "Metadata update for %s: %s\n", key, val);
next = end + 2;
}
}
static int store_icy(URLContext *h, int size)
{
HTTPContext *s = h->priv_data;
/* until next metadata packet */
uint64_t remaining;
if (s->icy_metaint < s->icy_data_read)
return AVERROR_INVALIDDATA;
remaining = s->icy_metaint - s->icy_data_read;
if (!remaining) {
/* The metadata packet is variable sized. It has a 1 byte header
* which sets the length of the packet (divided by 16). If it's 0,
* the metadata doesn't change. After the packet, icy_metaint bytes
* of normal data follows. */
uint8_t ch;
int len = http_read_stream_all(h, &ch, 1);
if (len < 0)
return len;
if (ch > 0) {
char data[255 * 16 + 1];
int ret;
len = ch * 16;
ret = http_read_stream_all(h, data, len);
if (ret < 0)
return ret;
data[len + 1] = 0;
if ((ret = av_opt_set(s, "icy_metadata_packet", data, 0)) < 0)
return ret;
update_metadata(h, data);
}
s->icy_data_read = 0;
remaining = s->icy_metaint;
}
return FFMIN(size, remaining);
}
static int http_read(URLContext *h, uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
if (s->icy_metaint > 0) {
size = store_icy(h, size);
if (size < 0)
return size;
}
size = http_read_stream(h, buf, size);
if (size > 0)
s->icy_data_read += size;
return size;
}
/* used only when posting data */
static int http_write(URLContext *h, const uint8_t *buf, int size)
{
char temp[11] = ""; /* 32-bit hex + CRLF + nul */
int ret;
char crlf[] = "\r\n";
HTTPContext *s = h->priv_data;
if (!s->chunked_post) {
/* non-chunked data is sent without any special encoding */
return ffurl_write(s->hd, buf, size);
}
/* silently ignore zero-size data since chunk encoding that would
* signal EOF */
if (size > 0) {
/* upload data using chunked encoding */
snprintf(temp, sizeof(temp), "%x\r\n", size);
if ((ret = ffurl_write(s->hd, temp, strlen(temp))) < 0 ||
(ret = ffurl_write(s->hd, buf, size)) < 0 ||
(ret = ffurl_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
return ret;
}
return size;
}
static int http_shutdown(URLContext *h, int flags)
{
int ret = 0;
char footer[] = "0\r\n\r\n";
HTTPContext *s = h->priv_data;
/* signal end of chunked encoding if used */
if (((flags & AVIO_FLAG_WRITE) && s->chunked_post) ||
((flags & AVIO_FLAG_READ) && s->chunked_post && s->listen)) {
ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
ret = ret > 0 ? 0 : ret;
/* flush the receive buffer when it is write only mode */
if (!(flags & AVIO_FLAG_READ)) {
char buf[1024];
int read_ret;
s->hd->flags |= AVIO_FLAG_NONBLOCK;
read_ret = ffurl_read(s->hd, buf, sizeof(buf));
s->hd->flags &= ~AVIO_FLAG_NONBLOCK;
if (read_ret < 0 && read_ret != AVERROR(EAGAIN)) {
av_log(h, AV_LOG_ERROR, "URL read error: %s\n", av_err2str(read_ret));
ret = read_ret;
}
}
s->end_chunked_post = 1;
}
return ret;
}
static int http_close(URLContext *h)
{
int ret = 0;
HTTPContext *s = h->priv_data;
#if CONFIG_ZLIB
inflateEnd(&s->inflate_stream);
av_freep(&s->inflate_buffer);
#endif /* CONFIG_ZLIB */
if (s->hd && !s->end_chunked_post)
/* Close the write direction by sending the end of chunked encoding. */
ret = http_shutdown(h, h->flags);
if (s->hd)
ffurl_closep(&s->hd);
av_dict_free(&s->chained_options);
return ret;
}
static int64_t http_seek_internal(URLContext *h, int64_t off, int whence, int force_reconnect)
{
HTTPContext *s = h->priv_data;
URLContext *old_hd = s->hd;
uint64_t old_off = s->off;
uint8_t old_buf[BUFFER_SIZE];
int old_buf_size, ret;
AVDictionary *options = NULL;
if (whence == AVSEEK_SIZE)
return s->filesize;
else if (!force_reconnect &&
((whence == SEEK_CUR && off == 0) ||
(whence == SEEK_SET && off == s->off)))
return s->off;
else if ((s->filesize == UINT64_MAX && whence == SEEK_END))
return AVERROR(ENOSYS);
if (whence == SEEK_CUR)
off += s->off;
else if (whence == SEEK_END)
off += s->filesize;
else if (whence != SEEK_SET)
return AVERROR(EINVAL);
if (off < 0)
return AVERROR(EINVAL);
s->off = off;
if (s->off && h->is_streamed)
return AVERROR(ENOSYS);
/* do not try to make a new connection if seeking past the end of the file */
if (s->end_off || s->filesize != UINT64_MAX) {
uint64_t end_pos = s->end_off ? s->end_off : s->filesize;
if (s->off >= end_pos)
return s->off;
}
/* we save the old context in case the seek fails */
old_buf_size = s->buf_end - s->buf_ptr;
memcpy(old_buf, s->buf_ptr, old_buf_size);
s->hd = NULL;
/* if it fails, continue on old connection */
if ((ret = http_open_cnx(h, &options)) < 0) {
av_dict_free(&options);
memcpy(s->buffer, old_buf, old_buf_size);
s->buf_ptr = s->buffer;
s->buf_end = s->buffer + old_buf_size;
s->hd = old_hd;
s->off = old_off;
return ret;
}
av_dict_free(&options);
ffurl_close(old_hd);
return off;
}
static int64_t http_seek(URLContext *h, int64_t off, int whence)
{
return http_seek_internal(h, off, whence, 0);
}
static int http_get_file_handle(URLContext *h)
{
HTTPContext *s = h->priv_data;
return ffurl_get_file_handle(s->hd);
}
static int http_get_short_seek(URLContext *h)
{
HTTPContext *s = h->priv_data;
return ffurl_get_short_seek(s->hd);
}
#define HTTP_CLASS(flavor) \
static const AVClass flavor ## _context_class = { \
.class_name = # flavor, \
.item_name = av_default_item_name, \
.option = options, \
.version = LIBAVUTIL_VERSION_INT, \
}
#if CONFIG_HTTP_PROTOCOL
HTTP_CLASS(http);
const URLProtocol ff_http_protocol = {
.name = "http",
.url_open2 = http_open,
.url_accept = http_accept,
.url_handshake = http_handshake,
.url_read = http_read,
.url_write = http_write,
.url_seek = http_seek,
.url_close = http_close,
.url_get_file_handle = http_get_file_handle,
.url_get_short_seek = http_get_short_seek,
.url_shutdown = http_shutdown,
.priv_data_size = sizeof(HTTPContext),
.priv_data_class = &http_context_class,
.flags = URL_PROTOCOL_FLAG_NETWORK,
.default_whitelist = "http,https,tls,rtp,tcp,udp,crypto,httpproxy,data"
};
#endif /* CONFIG_HTTP_PROTOCOL */
#if CONFIG_HTTPS_PROTOCOL
HTTP_CLASS(https);
const URLProtocol ff_https_protocol = {
.name = "https",
.url_open2 = http_open,
.url_read = http_read,
.url_write = http_write,
.url_seek = http_seek,
.url_close = http_close,
.url_get_file_handle = http_get_file_handle,
.url_get_short_seek = http_get_short_seek,
.url_shutdown = http_shutdown,
.priv_data_size = sizeof(HTTPContext),
.priv_data_class = &https_context_class,
.flags = URL_PROTOCOL_FLAG_NETWORK,
.default_whitelist = "http,https,tls,rtp,tcp,udp,crypto,httpproxy"
};
#endif /* CONFIG_HTTPS_PROTOCOL */
#if CONFIG_HTTPPROXY_PROTOCOL
static int http_proxy_close(URLContext *h)
{
HTTPContext *s = h->priv_data;
if (s->hd)
ffurl_closep(&s->hd);
return 0;
}
static int http_proxy_open(URLContext *h, const char *uri, int flags)
{
HTTPContext *s = h->priv_data;
char hostname[1024], hoststr[1024];
char auth[1024], pathbuf[1024], *path;
char lower_url[100];
int port, ret = 0, attempts = 0;
HTTPAuthType cur_auth_type;
char *authstr;
int new_loc;
if( s->seekable == 1 )
h->is_streamed = 0;
else
h->is_streamed = 1;
av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
pathbuf, sizeof(pathbuf), uri);
ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
path = pathbuf;
if (*path == '/')
path++;
ff_url_join(lower_url, sizeof(lower_url), "tcp", NULL, hostname, port,
NULL);
redo:
ret = ffurl_open_whitelist(&s->hd, lower_url, AVIO_FLAG_READ_WRITE,
&h->interrupt_callback, NULL,
h->protocol_whitelist, h->protocol_blacklist, h);
if (ret < 0)
return ret;
authstr = ff_http_auth_create_response(&s->proxy_auth_state, auth,
path, "CONNECT");
snprintf(s->buffer, sizeof(s->buffer),
"CONNECT %s HTTP/1.1\r\n"
"Host: %s\r\n"
"Connection: close\r\n"
"%s%s"
"\r\n",
path,
hoststr,
authstr ? "Proxy-" : "", authstr ? authstr : "");
av_freep(&authstr);
if ((ret = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)
goto fail;
s->buf_ptr = s->buffer;
s->buf_end = s->buffer;
s->line_count = 0;
s->filesize = UINT64_MAX;
cur_auth_type = s->proxy_auth_state.auth_type;
/* Note: This uses buffering, potentially reading more than the
* HTTP header. If tunneling a protocol where the server starts
* the conversation, we might buffer part of that here, too.
* Reading that requires using the proper ffurl_read() function
* on this URLContext, not using the fd directly (as the tls
* protocol does). This shouldn't be an issue for tls though,
* since the client starts the conversation there, so there
* is no extra data that we might buffer up here.
*/
ret = http_read_header(h, &new_loc);
if (ret < 0)
goto fail;
attempts++;
if (s->http_code == 407 &&
(cur_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 2) {
ffurl_closep(&s->hd);
goto redo;
}
if (s->http_code < 400)
return 0;
ret = ff_http_averror(s->http_code, AVERROR(EIO));
fail:
http_proxy_close(h);
return ret;
}
static int http_proxy_write(URLContext *h, const uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
return ffurl_write(s->hd, buf, size);
}
const URLProtocol ff_httpproxy_protocol = {
.name = "httpproxy",
.url_open = http_proxy_open,
.url_read = http_buf_read,
.url_write = http_proxy_write,
.url_close = http_proxy_close,
.url_get_file_handle = http_get_file_handle,
.priv_data_size = sizeof(HTTPContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
#endif /* CONFIG_HTTPPROXY_PROTOCOL */
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