/* * 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 "avformat.h"#include "internal.h"#include "network.h"#include "http.h"#include "os_support.h"#include "httpauth.h"#include "url.h"#include "libavutil/opt.h" /* XXX: POST protocol is not completely implemented because avconv uses   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. */    int64_t off, filesize;    char location[MAX_URL_SIZE];    HTTPAuthState auth_state;    HTTPAuthState proxy_auth_state;    char *headers;    int willclose;          /**< Set if the server correctly handles Connection: close and will close the connection after feeding us the content. */    int chunked_post;    int end_chunked_post;   /**< A flag which indicates if the end of chunked encoding has been sent. */    int end_header;         /**< A flag which indicates we have finished to read POST reply. */    int multiple_requests;  /**< A flag which indicates if we use persistent connections. */    uint8_t *post_data;    int post_datalen;} HTTPContext; #define OFFSET(x) offsetof(HTTPContext, x)#define D AV_OPT_FLAG_DECODING_PARAM#define E AV_OPT_FLAG_ENCODING_PARAMstatic const AVOption options[] = {{"chunked_post", "use chunked transfer-encoding for posts", OFFSET(chunked_post), AV_OPT_TYPE_INT, {.dbl = 1}, 0, 1, E },{"headers", "custom HTTP headers, can override built in default headers", OFFSET(headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },{"multiple_requests", "use persistent connections", OFFSET(multiple_requests), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, D|E },{"post_data", "custom HTTP post data", OFFSET(post_data), AV_OPT_TYPE_BINARY, .flags = D|E },{NULL}};#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,\} HTTP_CLASS(http);HTTP_CLASS(https); 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); 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));} /* return non zero if error */static int http_open_cnx(URLContext *h){    const char *path, *proxy_path, *lower_proto = "tcp", *local_path;    char hostname[1024], hoststr[1024], proto[10];    char auth[1024], proxyauth[1024] = "";    char path1[1024];    char buf[1024], urlbuf[1024];    int port, use_proxy, err, location_changed = 0, redirects = 0, attempts = 0;    HTTPAuthType cur_auth_type, cur_proxy_auth_type;    HTTPContext *s = h->priv_data;     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,                 path1, sizeof(path1), s->location);    ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);     if (!strcmp(proto, "https")) {        lower_proto = "tls";        use_proxy = 0;        if (port < 0)            port = 443;    }    if (port < 0)        port = 80;     if (path1[0] == '\0')        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(&s->hd, buf, AVIO_FLAG_READ_WRITE,                         &h->interrupt_callback, NULL);        if (err < 0)            goto fail;    }     cur_auth_type = s->auth_state.auth_type;    cur_proxy_auth_type = s->auth_state.auth_type;    if (http_connect(h, path, local_path, hoststr, auth, proxyauth, &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_close(s->hd);            s->hd = NULL;            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_close(s->hd);            s->hd = NULL;            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_close(s->hd);        s->hd = NULL;        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_close(s->hd);    s->hd = NULL;    return AVERROR(EIO);} int ff_http_do_new_request(URLContext *h, const char *uri){    HTTPContext *s = h->priv_data;     s->off = 0;    av_strlcpy(s->location, uri, sizeof(s->location));     return http_open_cnx(h);} static int http_open(URLContext *h, const char *uri, int flags){    HTTPContext *s = h->priv_data;     h->is_streamed = 1;     s->filesize = -1;    av_strlcpy(s->location, uri, sizeof(s->location));     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.\n");    }     return http_open_cnx(h);}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 -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 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 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') {        s->end_header = 1;        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            || s->auth_state.auth_type != HTTP_AUTH_NONE) &&            (s->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",                   s->http_code, end);            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")) {            strcpy(s->location, p);            *new_location = 1;        } else if (!av_strcasecmp (tag, "Content-Length") && s->filesize == -1) {            s->filesize = strtoll(p, NULL, 10);        } else if (!av_strcasecmp (tag, "Content-Range")) {            /* "bytes $from-$to/$document_size" */            const char *slash;            if (!strncmp (p, "bytes ", 6)) {                p += 6;                s->off = strtoll(p, NULL, 10);                if ((slash = strchr(p, '/')) && strlen(slash) > 0)                    s->filesize = strtoll(slash+1, NULL, 10);            }            h->is_streamed = 0; /* we _can_ in fact seek */        } else if (!av_strcasecmp(tag, "Accept-Ranges") && !strncmp(p, "bytes", 5)) {            h->is_streamed = 0;        } else if (!av_strcasecmp (tag, "Transfer-Encoding") && !av_strncasecmp(p, "chunked", 7)) {            s->filesize = -1;            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;        }    }    return 1;} 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[1024];    int err = 0;     s->chunksize = -1;     for (;;) {        if ((err = http_get_line(s, line, sizeof(line))) < 0)            return err;         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 err;} 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;    char headers[1024] = "";    char *authstr = NULL, *proxyauthstr = NULL;    int64_t off = s->off;    int len = 0;    const char *method;      /* 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;    }     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);     /* 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: ") && !post)        len += av_strlcatf(headers + len, sizeof(headers) - len,                           "Range: bytes=%"PRId64"-\r\n", s->off);     if (!has_header(s->headers, "\r\nConnection: ")) {        if (s->multiple_requests) {            len += av_strlcpy(headers + len, "Connection: keep-alive\r\n",                              sizeof(headers) - len);        } else {            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);    if (!has_header(s->headers, "\r\nContent-Length: ") && s->post_data)        len += av_strlcatf(headers + len, sizeof(headers) - len,                           "Content-Length: %d\r\n", s->post_datalen);     /* now add in custom headers */    if (s->headers)        av_strlcpy(headers + len, s->headers, sizeof(headers) - len);     snprintf(s->buffer, sizeof(s->buffer),             "%s %s HTTP/1.1\r\n"             "%s"             "%s"             "%s"             "%s%s"             "\r\n",             method,             path,             post && s->chunked_post ? "Transfer-Encoding: chunked\r\n" : "",             headers,             authstr ? authstr : "",             proxyauthstr ? "Proxy-" : "", proxyauthstr ? proxyauthstr : "");     av_freep(&authstr);    av_freep(&proxyauthstr);    if ((err = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)        return err;     if (s->post_data)        if ((err = ffurl_write(s->hd, s->post_data, s->post_datalen)) < 0)            return err;     /* init input buffer */    s->buf_ptr = s->buffer;    s->buf_end = s->buffer;    s->line_count = 0;    s->off = 0;    s->filesize = -1;    s->willclose = 0;    s->end_chunked_post = 0;    s->end_header = 0;    if (post && !s->post_data) {        /* 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;        return 0;    }     /* wait for header */    err = http_read_header(h, new_location);    if (err < 0)        return err;     return (off == s->off) ? 0 : -1;}  static int http_buf_read(URLContext *h, uint8_t *buf, int size){    HTTPContext *s = h->priv_data;    int len;    /* 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);    }    if (len > 0) {

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