[FFmpeg-devel] [PATCH 6/8] lavf/http: increase range for listen, handle connection closing accordingly, add http_accept, add http_handshake and move handshake logic there
Stephan Holljes
klaxa1337 at googlemail.com
Tue Jul 21 06:15:13 CEST 2015
On Tue, Jul 21, 2015 at 5:45 AM, Stephan Holljes
<klaxa1337 at googlemail.com> wrote:
> Signed-off-by: Stephan Holljes <klaxa1337 at googlemail.com>
> ---
> libavformat/http.c | 126 ++++++++++++++++++++++++++++++++++++++++++++---------
> 1 file changed, 105 insertions(+), 21 deletions(-)
>
> Changes since last version:
> - Introduce constants for different client modes
> - Add resource and http_code to AVOptions
> - Add http_write_header()
> - Implement handshake that allows multiple roundtrips between application
> and library.
>
> diff --git a/libavformat/http.c b/libavformat/http.c
> index 676bfd5..2597628 100644
> --- a/libavformat/http.c
> +++ b/libavformat/http.c
> @@ -25,6 +25,7 @@
> #include <zlib.h>
> #endif /* CONFIG_ZLIB */
>
> +#include "libavutil/avassert.h"
> #include "libavutil/avstring.h"
> #include "libavutil/opt.h"
>
> @@ -44,6 +45,9 @@
> * path names). */
> #define BUFFER_SIZE MAX_URL_SIZE
> #define MAX_REDIRECTS 8
> +#define HTTP_ONESHOT 1
> +#define HTTP_MUTLI 2
> +#define HTTP_MULTI_CLIENT 4
>
> typedef struct HTTPContext {
> const AVClass *class;
> @@ -97,6 +101,7 @@ typedef struct HTTPContext {
> char *method;
> int reconnect;
> int listen;
> + char *resource;
> } HTTPContext;
>
> #define OFFSET(x) offsetof(HTTPContext, x)
> @@ -128,7 +133,9 @@ static const AVOption options[] = {
> { "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_INT, { .i64 = 0 }, 0, 1, D },
> - { "listen", "listen on HTTP", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D | E },
> + { "listen", "listen on HTTP", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 4, D | E },
> + { "resource", "The resource requested by a client", OFFSET(resource), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
> + { "http_code", "The http code to send to a client", OFFSET(http_code), AV_OPT_TYPE_INT, { .i64 = 0}, 0, 599, E},
> { NULL }
> };
>
> @@ -299,32 +306,87 @@ int ff_http_averror(int status_code, int default_averror)
> return default_averror;
> }
>
> +static int http_write_header(URLContext* h, int status_code)
> +{
> + int ret;
> + const char *message;
> + // Maybe this should be done more elegantly?
> + static const char bad_request[] = "HTTP/1.1 400 Bad Request\r\nContent-Type: text/plain\r\nContent-Length: 17\r\n400 Bad Request\r\n";
> + static const char forbidden[] = "HTTP/1.1 403 Forbidden\r\nContent-Type: text/plain\r\nContent-Length: 15\r\n\r\n403 Forbidden\r\n";
> + static const char not_found[] = "HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\nContent-Length: 15\r\n\r\n404 Not Found\r\n";
> + static const char internal_server_error[] = "HTTP/1.1 500 Internal server error\r\nContent-Type: text/plain\r\nContent-Length: 25\r\n\r\n500 Internal server error\r\n";
> + static const char ok[] = "HTTP/1.1 200 OK\r\nContent-Type: application/octet-stream\r\nTransfer-Encoding: chunked\r\n\r\n";
> + av_log(h, AV_LOG_TRACE, "err: %d\n", status_code);
> + if (status_code == 200) {
> + message = ok;
> + goto end;
> + }
> + switch(status_code) {
> + case AVERROR_HTTP_BAD_REQUEST:
> + message = bad_request;
> + break;
> + case AVERROR_HTTP_FORBIDDEN:
> + message = forbidden;
> + break;
> + case AVERROR_HTTP_NOT_FOUND:
> + message = not_found;
> + break;
> + default:
> + message = internal_server_error;
> + }
> +end:
> + if ((ret = ffurl_write(h, message, strlen(message))) < 0)
> + return ret;
> + // Avoid returning a positive value from ffurl_write()
> + ret = ret > 0 ? 0 : ret;
> + return ret;
> +}
> +
> static void handle_http_errors(URLContext *h, int error)
> {
> - static const char bad_request[] = "HTTP/1.1 400 Bad Request\r\nContent-Type: text/plain\r\n\r\n400 Bad Request\r\n";
> - static const char internal_server_error[] = "HTTP/1.1 500 Internal server error\r\nContent-Type: text/plain\r\n\r\n500 Internal server error\r\n";
> HTTPContext *s = h->priv_data;
> - if (h->is_connected) {
> - switch(error) {
> - case AVERROR_HTTP_BAD_REQUEST:
> - ffurl_write(s->hd, bad_request, strlen(bad_request));
> - break;
> - default:
> - av_log(h, AV_LOG_ERROR, "Unhandled HTTP error.\n");
> - ffurl_write(s->hd, internal_server_error, strlen(internal_server_error));
> + URLContext *c = s->hd;
> + av_assert0(error < 0);
> + http_write_header(c, error);
> +}
> +
> +static int http_handshake(URLContext *c)
> +{
> + int ret, err, new_location;
> + HTTPContext *ch = c->priv_data;
> + URLContext *cl = ch->hd;
> + for (;;) {
> + if ((ret = ffurl_handshake(cl)) < 0)
> + return ret;
> + if (ret == 0)
> + break;
> + }
> + if (!ch->end_header) {
> + if ((err = http_read_header(c, &new_location)) < 0)
> + goto fail;
> + }
> + if (ch->http_code) {
> + if (ch->http_code == 200) {
> + http_write_header(cl, 200);
> + return 0;
> }
> + err = ff_http_averror(ch->http_code, AVERROR(EIO));
> + goto fail;
> }
> + return 1;
> +fail:
> + handle_http_errors(c, err);
> + return err;
> }
>
> static int http_listen(URLContext *h, const char *uri, int flags,
> AVDictionary **options) {
> HTTPContext *s = h->priv_data;
> int ret;
> - static const char header[] = "HTTP/1.1 200 OK\r\nContent-Type: application/octet-stream\r\nTransfer-Encoding: chunked\r\n\r\n";
> char hostname[1024], proto[10];
> char lower_url[100];
> const char *lower_proto = "tcp";
> - int port, new_location;
> + int port;
> s->chunked_post = 1;
> av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port,
> NULL, 0, uri);
> @@ -332,18 +394,17 @@ static int http_listen(URLContext *h, const char *uri, int flags,
> lower_proto = "tls";
> ff_url_join(lower_url, sizeof(lower_url), lower_proto, NULL, hostname, port,
> NULL);
> - av_dict_set(options, "listen", "1", 0);
> + if ((ret = av_dict_set_int(options, "listen", s->listen, 0)) < 0)
> + goto fail;
> if ((ret = ffurl_open(&s->hd, lower_url, AVIO_FLAG_READ_WRITE,
> &h->interrupt_callback, options)) < 0)
> goto fail;
> - if ((ret = http_read_header(h, &new_location)) < 0)
> - goto fail;
> - if ((ret = ffurl_write(s->hd, header, strlen(header))) < 0)
> - goto fail;
> - return 0;
> -
> + if (s->listen == HTTP_ONESHOT) { /* single client */
> + s->http_code = 200;
> + // Setting the http_code to 200 should ensure that http_handshake() returns 0.
> + ret = http_handshake(h);
> + }
> fail:
> - handle_http_errors(h, ret);
> av_dict_free(&s->chained_options);
> return ret;
> }
> @@ -382,6 +443,25 @@ static int http_open(URLContext *h, const char *uri, int flags,
> 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;
> + av_assert0(sc->listen);
> + if ((ret = ffurl_alloc(c, s->filename, s->flags & AVIO_FLAG_READ_WRITE, &sl->interrupt_callback)) < 0)
> + goto fail;
> + cc = (*c)->priv_data;
> + if ((ret = ffurl_accept(sl, &cl)) < 0)
> + goto fail;
> + cc->hd = cl;
> + cc->listen = HTTP_MULTI_CLIENT;
> +fail:
> + return ret;
> +}
> +
> static int http_getc(HTTPContext *s)
> {
> int len;
> @@ -597,6 +677,7 @@ static int process_line(URLContext *h, char *line, int line_count,
> "(%s autodetected %s received)\n", auto_method, method);
> return ff_http_averror(400, AVERROR(EIO));
> }
> + s->method = av_strdup(method);
> }
>
> // HTTP resource
> @@ -607,6 +688,7 @@ static int process_line(URLContext *h, char *line, int line_count,
> p++;
> *(p++) = '\0';
> av_log(h, AV_LOG_TRACE, "Requested resource: %s\n", resource);
> + s->resource = av_strdup(resource);
>
> // HTTP version
> while (av_isspace(*p))
> @@ -1346,6 +1428,8 @@ HTTP_CLASS(http);
> 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,
> --
> 2.1.0
>
The same s->flags issue, also fixed the same way in the attached patch.
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