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  •  * HTTP protocol for avconv client
    
     * Copyright (c) 2000, 2001 Fabrice Bellard
    
     * This file is part of Libav.
    
     * Libav 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.
     *
    
     * Libav 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 Libav; if not, write to the Free Software
    
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     */
    
    
    #include "libavutil/avstring.h"
    
    #include "http.h"
    
    #include "url.h"
    
    #include "libavutil/opt.h"
    
    /* XXX: POST protocol is not completely implemented because avconv uses
    
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       only a subset of it. */
    
    
    /* used for protocol handling */
    #define BUFFER_SIZE 1024
    #define MAX_REDIRECTS 8
    
    typedef struct {
    
        const AVClass *class;
    
        URLContext *hd;
        unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
        int line_count;
        int http_code;
    
        int64_t chunksize;      /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
    
        unsigned char headers[BUFFER_SIZE];
    
        int willclose;          /**< Set if the server correctly handles Connection: close and will close the connection after feeding us the content. */
    
    #define OFFSET(x) offsetof(HTTPContext, x)
    static const AVOption options[] = {
    
    {"chunksize", "use chunked transfer-encoding for posts, -1 disables it, 0 enables it", OFFSET(chunksize), AV_OPT_TYPE_INT64, {.dbl = 0}, -1, 0 }, /* Default to 0, for chunked POSTs */
    
    {NULL}
    };
    static const AVClass httpcontext_class = {
    
        .class_name     = "HTTP",
        .item_name      = av_default_item_name,
        .option         = options,
        .version        = LIBAVUTIL_VERSION_INT,
    
    static int http_connect(URLContext *h, const char *path, const char *hoststr,
                            const char *auth, int *new_location);
    
    
    void ff_http_set_headers(URLContext *h, const char *headers)
    {
        HTTPContext *s = h->priv_data;
        int len = strlen(headers);
    
        if (len && strcmp("\r\n", headers + len - 2))
    
            av_log(h, AV_LOG_ERROR, "No trailing CRLF found in HTTP header.\n");
    
    
        av_strlcpy(s->headers, headers, sizeof(s->headers));
    }
    
    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));
    }
    
    
    /* return non zero if error */
    static int http_open_cnx(URLContext *h)
    {
    
        const char *path, *proxy_path, *lower_proto = "tcp";
        char hostname[1024], hoststr[1024], proto[10];
    
        char auth[1024];
        char path1[1024];
        char buf[1024];
        int port, use_proxy, err, location_changed = 0, redirects = 0;
    
        HTTPAuthType cur_auth_type;
    
        HTTPContext *s = h->priv_data;
        URLContext *hd = NULL;
    
        proxy_path = getenv("http_proxy");
        use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
    
            av_strstart(proxy_path, "http://", NULL);
    
    
        /* fill the dest addr */
     redo:
        /* needed in any case to build the host string */
    
        av_url_split(proto, sizeof(proto), auth, sizeof(auth),
                     hostname, sizeof(hostname), &port,
    
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                     path1, sizeof(path1), s->location);
    
        ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
    
            av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
    
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                         NULL, 0, proxy_path);
    
            path = s->location;
        } else {
            if (path1[0] == '\0')
                path = "/";
            else
                path = path1;
        }
    
        if (!strcmp(proto, "https")) {
            lower_proto = "tls";
            if (port < 0)
                port = 443;
        }
    
        ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);
    
        err = ffurl_open(&hd, buf, AVIO_FLAG_READ_WRITE);
    
        cur_auth_type = s->auth_state.auth_type;
    
        if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
            goto fail;
    
        if (s->http_code == 401) {
            if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
    
                ffurl_close(hd);
    
        if ((s->http_code == 301 || s->http_code == 302 || s->http_code == 303 || s->http_code == 307)
            && location_changed == 1) {
    
            ffurl_close(hd);
    
            ffurl_close(hd);
    
    }
    
    static int http_open(URLContext *h, const char *uri, int flags)
    {
    
        HTTPContext *s = h->priv_data;
    
        av_strlcpy(s->location, uri, sizeof(s->location));
    
    }
    static int http_getc(HTTPContext *s)
    {
        int len;
        if (s->buf_ptr >= s->buf_end) {
    
            len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE);
    
            } else if (len == 0) {
                return -1;
            } 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 AVERROR(EIO);
            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 process_line(URLContext *h, char *line, int line_count,
                            int *new_location)
    {
        HTTPContext *s = h->priv_data;
    
        char *tag, *p, *end;
    
    
        /* end of header */
        if (line[0] == '\0')
            return 0;
    
        p = line;
        if (line_count == 0) {
            while (!isspace(*p) && *p != '\0')
                p++;
            while (isspace(*p))
                p++;
    
            s->http_code = strtol(p, &end, 10);
    
            av_dlog(NULL, "http_code=%d\n", s->http_code);
    
            /* error codes are 4xx and 5xx, but regard 401 as a success, so we
             * don't abort until all headers have been parsed. */
    
            if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401) {
                end += strspn(end, SPACE_CHARS);
    
                av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n",
    
                return -1;
    
        } else {
            while (*p != '\0' && *p != ':')
                p++;
            if (*p != ':')
                return 1;
    
            *p = '\0';
            tag = line;
            p++;
            while (isspace(*p))
                p++;
    
            if (!av_strcasecmp(tag, "Location")) {
    
            } else if (!av_strcasecmp (tag, "Content-Length") && s->filesize == -1) {
    
            } else if (!av_strcasecmp (tag, "Content-Range")) {
    
                /* "bytes $from-$to/$document_size" */
                const char *slash;
                if (!strncmp (p, "bytes ", 6)) {
                    p += 6;
                    s->off = atoll(p);
                    if ((slash = strchr(p, '/')) && strlen(slash) > 0)
                        s->filesize = atoll(slash+1);
                }
                h->is_streamed = 0; /* we _can_ in fact seek */
    
            } else if (!av_strcasecmp(tag, "Accept-Ranges") && !strncmp(p, "bytes", 5)) {
    
            } else if (!av_strcasecmp (tag, "Transfer-Encoding") && !av_strncasecmp(p, "chunked", 7)) {
    
            } 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, "Connection")) {
    
    static inline int has_header(const char *str, const char *header)
    {
        /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
        return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
    }
    
    
    static int http_connect(URLContext *h, const char *path, const char *hoststr,
                            const char *auth, int *new_location)
    {
        HTTPContext *s = h->priv_data;
    
        char headers[1024] = "";
    
        authstr = ff_http_auth_create_response(&s->auth_state, auth, path,
                                            post ? "POST" : "GET");
    
    
        /* set default headers if needed */
        if (!has_header(s->headers, "\r\nUser-Agent: "))
           len += av_strlcatf(headers + len, sizeof(headers) - len,
                              "User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
        if (!has_header(s->headers, "\r\nAccept: "))
            len += av_strlcpy(headers + len, "Accept: */*\r\n",
                              sizeof(headers) - len);
        if (!has_header(s->headers, "\r\nRange: "))
            len += av_strlcatf(headers + len, sizeof(headers) - len,
    
                               "Range: bytes=%"PRId64"-\r\n", s->off);
    
        if (!has_header(s->headers, "\r\nConnection: "))
            len += av_strlcpy(headers + len, "Connection: close\r\n",
                              sizeof(headers)-len);
        if (!has_header(s->headers, "\r\nHost: "))
            len += av_strlcatf(headers + len, sizeof(headers) - len,
                               "Host: %s\r\n", hoststr);
    
        /* now add in custom headers */
        av_strlcpy(headers+len, s->headers, sizeof(headers)-len);
    
    
        snprintf(s->buffer, sizeof(s->buffer),
                 "%s %s HTTP/1.1\r\n"
    
                 post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "",
    
                 headers,
                 authstr ? authstr : "");
    
        if (ffurl_write(s->hd, s->buffer, strlen(s->buffer)) < 0)
    
    
        /* init input buffer */
        s->buf_ptr = s->buffer;
        s->buf_end = s->buffer;
        s->line_count = 0;
        s->off = 0;
    
            /* 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;
    
            if (http_get_line(s, line, sizeof(line)) < 0)
    
            av_dlog(NULL, "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++;
    
        }
    
        return (off == s->off) ? 0 : -1;
    }
    
    
    static int http_read(URLContext *h, uint8_t *buf, int size)
    {
        HTTPContext *s = h->priv_data;
        int len;
    
    
        if (s->chunksize >= 0) {
            if (!s->chunksize) {
                char line[32];
    
                for(;;) {
                    do {
                        if (http_get_line(s, line, sizeof(line)) < 0)
                            return AVERROR(EIO);
                    } while (!*line);    /* skip CR LF from last chunk */
    
                    s->chunksize = strtoll(line, NULL, 16);
    
    
                    av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
    
    
                    if (!s->chunksize)
                        return 0;
                    break;
                }
            }
            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 {
    
            if (!s->willclose && s->filesize >= 0 && s->off >= s->filesize)
                return AVERROR_EOF;
    
            len = ffurl_read(s->hd, buf, size);
    
    static int http_write(URLContext *h, const uint8_t *buf, int size)
    
        char temp[11] = "";  /* 32-bit hex + CRLF + nul */
    
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            /* 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 */
    
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            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)
    
        int ret = 0;
        char footer[] = "0\r\n\r\n";
    
    
        /* signal end of chunked encoding if used */
    
        if ((h->flags & AVIO_FLAG_WRITE) && s->chunksize != -1) {
    
            ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
    
            ffurl_close(s->hd);
    
    static int64_t http_seek(URLContext *h, int64_t off, int whence)
    
    {
        HTTPContext *s = h->priv_data;
        URLContext *old_hd = s->hd;
    
        int64_t old_off = s->off;
    
        uint8_t old_buf[BUFFER_SIZE];
        int old_buf_size;
    
    
        if (whence == AVSEEK_SIZE)
            return s->filesize;
        else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
            return -1;
    
        /* 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 (whence == SEEK_CUR)
            off += s->off;
        else if (whence == SEEK_END)
            off += s->filesize;
        s->off = off;
    
        /* if it fails, continue on old connection */
        if (http_open_cnx(h) < 0) {
    
            memcpy(s->buffer, old_buf, old_buf_size);
            s->buf_ptr = s->buffer;
            s->buf_end = s->buffer + old_buf_size;
    
        ffurl_close(old_hd);
    
    static int
    http_get_file_handle(URLContext *h)
    {
        HTTPContext *s = h->priv_data;
    
        return ffurl_get_file_handle(s->hd);
    
    #if CONFIG_HTTP_PROTOCOL
    
        .name                = "http",
        .url_open            = 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,
    
        .priv_data_size      = sizeof(HTTPContext),
        .priv_data_class     = &httpcontext_class,
    
    #endif
    #if CONFIG_HTTPS_PROTOCOL
    URLProtocol ff_https_protocol = {
        .name                = "https",
        .url_open            = 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,
        .priv_data_size      = sizeof(HTTPContext),
        .priv_data_class     = &httpcontext_class,
    };
    #endif