| /* |
| * 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/avstring.h" |
| #include "avformat.h" |
| #include <unistd.h> |
| #include <strings.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 ffmpeg 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; |
| 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. */ |
| } HTTPContext; |
| |
| #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), FF_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_set_chunked_transfer_encoding(URLContext *h, int is_chunked) |
| { |
| ((HTTPContext*)h->priv_data)->chunksize = is_chunked ? 0 : -1; |
| } |
| |
| 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; |
| char hostname[1024], hoststr[1024]; |
| 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(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port, |
| path1, sizeof(path1), s->location); |
| ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL); |
| |
| if (use_proxy) { |
| av_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; |
| |
| ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL); |
| err = ffurl_open(&hd, buf, AVIO_FLAG_READ_WRITE); |
| if (err < 0) |
| goto fail; |
| |
| s->hd = hd; |
| 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); |
| 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(hd); |
| if (redirects++ >= MAX_REDIRECTS) |
| return AVERROR(EIO); |
| location_changed = 0; |
| goto redo; |
| } |
| return 0; |
| fail: |
| if (hd) |
| ffurl_close(hd); |
| s->hd = NULL; |
| return AVERROR(EIO); |
| } |
| |
| 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)); |
| |
| 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 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 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", |
| 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 (!strcasecmp(tag, "Location")) { |
| strcpy(s->location, p); |
| *new_location = 1; |
| } else if (!strcasecmp (tag, "Content-Length") && s->filesize == -1) { |
| s->filesize = atoll(p); |
| } else if (!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 (!strcasecmp (tag, "Accept-Ranges") && !strncmp (p, "bytes", 5)) { |
| h->is_streamed = 0; |
| } else if (!strcasecmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) { |
| s->filesize = -1; |
| s->chunksize = 0; |
| } else if (!strcasecmp (tag, "WWW-Authenticate")) { |
| ff_http_auth_handle_header(&s->auth_state, tag, p); |
| } else if (!strcasecmp (tag, "Authentication-Info")) { |
| ff_http_auth_handle_header(&s->auth_state, tag, p); |
| } else if (!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!) */ |
| 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; |
| int post, err; |
| char line[1024]; |
| char headers[1024] = ""; |
| char *authstr = NULL; |
| int64_t off = s->off; |
| int len = 0; |
| |
| |
| /* send http header */ |
| post = h->flags & AVIO_FLAG_WRITE; |
| 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" |
| "%s" |
| "%s" |
| "%s" |
| "\r\n", |
| post ? "POST" : "GET", |
| path, |
| post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "", |
| headers, |
| authstr ? authstr : ""); |
| |
| av_freep(&authstr); |
| if (ffurl_write(s->hd, 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; |
| s->willclose = 0; |
| if (post) { |
| /* 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; |
| } |
| s->chunksize = -1; |
| |
| /* wait for header */ |
| for(;;) { |
| if (http_get_line(s, line, sizeof(line)) < 0) |
| return AVERROR(EIO); |
| |
| 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); |
| } |
| if (len > 0) { |
| s->off += len; |
| if (s->chunksize > 0) |
| s->chunksize -= len; |
| } |
| return len; |
| } |
| |
| /* 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->chunksize == -1) { |
| /* 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_close(URLContext *h) |
| { |
| int ret = 0; |
| char footer[] = "0\r\n\r\n"; |
| HTTPContext *s = h->priv_data; |
| |
| /* 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); |
| ret = ret > 0 ? 0 : ret; |
| } |
| |
| if (s->hd) |
| ffurl_close(s->hd); |
| return ret; |
| } |
| |
| 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; |
| s->hd = old_hd; |
| s->off = old_off; |
| return -1; |
| } |
| ffurl_close(old_hd); |
| return off; |
| } |
| |
| static int |
| http_get_file_handle(URLContext *h) |
| { |
| HTTPContext *s = h->priv_data; |
| return ffurl_get_file_handle(s->hd); |
| } |
| |
| URLProtocol ff_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, |
| }; |