| /* |
| * 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 "libavutil/base64.h" |
| #include "libavutil/avstring.h" |
| #include "avformat.h" |
| #include <unistd.h> |
| #include "network.h" |
| #include "os_support.h" |
| |
| /* XXX: POST protocol is not completely implemented because ffmpeg uses |
| only a subset of it. */ |
| |
| //#define DEBUG |
| |
| /* used for protocol handling */ |
| #define BUFFER_SIZE 1024 |
| #define URL_SIZE 4096 |
| #define MAX_REDIRECTS 8 |
| |
| typedef struct { |
| URLContext *hd; |
| unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end; |
| int line_count; |
| int http_code; |
| int64_t off, filesize; |
| char location[URL_SIZE]; |
| } HTTPContext; |
| |
| static int http_connect(URLContext *h, const char *path, const char *hoststr, |
| const char *auth, int *new_location); |
| static int http_write(URLContext *h, uint8_t *buf, int size); |
| |
| |
| /* return non zero if error */ |
| static int http_open_cnx(URLContext *h) |
| { |
| const char *path, *proxy_path; |
| char hostname[1024], hoststr[1024]; |
| char auth[1024]; |
| char path1[1024]; |
| char buf[1024]; |
| int port, use_proxy, err, location_changed = 0, redirects = 0; |
| 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 */ |
| url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port, |
| path1, sizeof(path1), s->location); |
| if (port > 0) { |
| snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port); |
| } else { |
| av_strlcpy(hoststr, hostname, sizeof(hoststr)); |
| } |
| |
| if (use_proxy) { |
| url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port, |
| NULL, 0, proxy_path); |
| path = s->location; |
| } else { |
| if (path1[0] == '\0') |
| path = "/"; |
| else |
| path = path1; |
| } |
| if (port < 0) |
| port = 80; |
| |
| snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port); |
| err = url_open(&hd, buf, URL_RDWR); |
| if (err < 0) |
| goto fail; |
| |
| s->hd = hd; |
| if (http_connect(h, path, hoststr, auth, &location_changed) < 0) |
| goto fail; |
| if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) { |
| /* url moved, get next */ |
| url_close(hd); |
| if (redirects++ >= MAX_REDIRECTS) |
| return AVERROR(EIO); |
| location_changed = 0; |
| goto redo; |
| } |
| return 0; |
| fail: |
| if (hd) |
| url_close(hd); |
| return AVERROR(EIO); |
| } |
| |
| static int http_open(URLContext *h, const char *uri, int flags) |
| { |
| HTTPContext *s; |
| int ret; |
| |
| h->is_streamed = 1; |
| |
| s = av_malloc(sizeof(HTTPContext)); |
| if (!s) { |
| return AVERROR(ENOMEM); |
| } |
| h->priv_data = s; |
| s->filesize = -1; |
| s->off = 0; |
| av_strlcpy(s->location, uri, URL_SIZE); |
| |
| ret = http_open_cnx(h); |
| if (ret != 0) |
| av_free (s); |
| return ret; |
| } |
| static int http_getc(HTTPContext *s) |
| { |
| int len; |
| if (s->buf_ptr >= s->buf_end) { |
| len = url_read(s->hd, s->buffer, BUFFER_SIZE); |
| if (len < 0) { |
| return AVERROR(EIO); |
| } else if (len == 0) { |
| return -1; |
| } else { |
| s->buf_ptr = s->buffer; |
| s->buf_end = s->buffer + len; |
| } |
| } |
| return *s->buf_ptr++; |
| } |
| |
| static int process_line(URLContext *h, char *line, int line_count, |
| int *new_location) |
| { |
| HTTPContext *s = h->priv_data; |
| char *tag, *p; |
| |
| /* 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, NULL, 10); |
| #ifdef DEBUG |
| printf("http_code=%d\n", s->http_code); |
| #endif |
| /* error codes are 4xx and 5xx */ |
| if (s->http_code >= 400 && s->http_code < 600) |
| return -1; |
| } else { |
| while (*p != '\0' && *p != ':') |
| p++; |
| if (*p != ':') |
| return 1; |
| |
| *p = '\0'; |
| tag = line; |
| p++; |
| while (isspace(*p)) |
| p++; |
| if (!strcmp(tag, "Location")) { |
| strcpy(s->location, p); |
| *new_location = 1; |
| } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) { |
| s->filesize = atoll(p); |
| } else if (!strcmp (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 */ |
| } |
| } |
| return 1; |
| } |
| |
| static int http_connect(URLContext *h, const char *path, const char *hoststr, |
| const char *auth, int *new_location) |
| { |
| HTTPContext *s = h->priv_data; |
| int post, err, ch; |
| char line[1024], *q; |
| char *auth_b64; |
| int auth_b64_len = (strlen(auth) + 2) / 3 * 4 + 1; |
| int64_t off = s->off; |
| |
| |
| /* send http header */ |
| post = h->flags & URL_WRONLY; |
| auth_b64 = av_malloc(auth_b64_len); |
| av_base64_encode(auth_b64, auth_b64_len, auth, strlen(auth)); |
| snprintf(s->buffer, sizeof(s->buffer), |
| "%s %s HTTP/1.1\r\n" |
| "User-Agent: %s\r\n" |
| "Accept: */*\r\n" |
| "Range: bytes=%"PRId64"-\r\n" |
| "Host: %s\r\n" |
| "Authorization: Basic %s\r\n" |
| "Connection: close\r\n" |
| "\r\n", |
| post ? "POST" : "GET", |
| path, |
| LIBAVFORMAT_IDENT, |
| s->off, |
| hoststr, |
| auth_b64); |
| |
| av_freep(&auth_b64); |
| if (http_write(h, s->buffer, strlen(s->buffer)) < 0) |
| return AVERROR(EIO); |
| |
| /* init input buffer */ |
| s->buf_ptr = s->buffer; |
| s->buf_end = s->buffer; |
| s->line_count = 0; |
| s->off = 0; |
| s->filesize = -1; |
| if (post) { |
| return 0; |
| } |
| |
| /* wait for header */ |
| 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'; |
| #ifdef DEBUG |
| printf("header='%s'\n", line); |
| #endif |
| err = process_line(h, line, s->line_count, new_location); |
| if (err < 0) |
| return err; |
| if (err == 0) |
| break; |
| s->line_count++; |
| q = line; |
| } else { |
| if ((q - line) < sizeof(line) - 1) |
| *q++ = ch; |
| } |
| } |
| |
| return (off == s->off) ? 0 : -1; |
| } |
| |
| |
| static int http_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 { |
| len = url_read(s->hd, buf, size); |
| } |
| if (len > 0) |
| s->off += len; |
| return len; |
| } |
| |
| /* used only when posting data */ |
| static int http_write(URLContext *h, uint8_t *buf, int size) |
| { |
| HTTPContext *s = h->priv_data; |
| return url_write(s->hd, buf, size); |
| } |
| |
| static int http_close(URLContext *h) |
| { |
| HTTPContext *s = h->priv_data; |
| url_close(s->hd); |
| av_free(s); |
| return 0; |
| } |
| |
| 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; |
| |
| 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 */ |
| 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) { |
| s->hd = old_hd; |
| s->off = old_off; |
| return -1; |
| } |
| url_close(old_hd); |
| return off; |
| } |
| |
| static int |
| http_get_file_handle(URLContext *h) |
| { |
| HTTPContext *s = h->priv_data; |
| return url_get_file_handle(s->hd); |
| } |
| |
| URLProtocol http_protocol = { |
| "http", |
| http_open, |
| http_read, |
| http_write, |
| http_seek, |
| http_close, |
| .url_get_file_handle = http_get_file_handle, |
| }; |