/* * 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 "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. */ char *user_agent; 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; } HTTPContext; #define OFFSET(x) offsetof(HTTPContext, x) #define D AV_OPT_FLAG_DECODING_PARAM #define E AV_OPT_FLAG_ENCODING_PARAM #define DEC AV_OPT_FLAG_DECODING_PARAM static 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 }, {"user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC}, {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; HTTPAuthType cur_auth_type, cur_proxy_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, 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); err = ffurl_open(&hd, buf, AVIO_FLAG_READ_WRITE, &h->interrupt_callback, NULL); if (err < 0) goto fail; s->hd = hd; 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; 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 == 407) { if (cur_proxy_auth_type == HTTP_AUTH_NONE && s->proxy_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)); 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 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 || 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 = atoll(p); } 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)) { 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_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 line[1024]; 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; 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", s->user_agent ? s->user_agent : 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: ")) 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 */ 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 (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_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) { s->off += len; if (s->chunksize > 0) s->chunksize -= len; } return len; } static int http_read(URLContext *h, uint8_t *buf, int size) { HTTPContext *s = h->priv_data; 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); } return http_buf_read(h, buf, size); } /* 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->chunked_post) { /* 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->chunked_post) { 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); } #if CONFIG_HTTP_PROTOCOL 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 = &http_context_class, .flags = URL_PROTOCOL_FLAG_NETWORK, }; #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 = &https_context_class, .flags = URL_PROTOCOL_FLAG_NETWORK, }; #endif #if CONFIG_HTTPPROXY_PROTOCOL static int http_proxy_close(URLContext *h) { HTTPContext *s = h->priv_data; if (s->hd) ffurl_close(s->hd); return 0; } static int http_proxy_open(URLContext *h, const char *uri, int flags) { HTTPContext *s = h->priv_data; char hostname[1024], hoststr[1024]; char auth[1024], pathbuf[1024], *path; char line[1024], lower_url[100]; int port, ret = 0; HTTPAuthType cur_auth_type; char *authstr; h->is_streamed = 1; av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port, pathbuf, sizeof(pathbuf), uri); ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL); path = pathbuf; if (*path == '/') path++; ff_url_join(lower_url, sizeof(lower_url), "tcp", NULL, hostname, port, NULL); redo: ret = ffurl_open(&s->hd, lower_url, AVIO_FLAG_READ_WRITE, &h->interrupt_callback, NULL); if (ret < 0) return ret; authstr = ff_http_auth_create_response(&s->proxy_auth_state, auth, path, "CONNECT"); snprintf(s->buffer, sizeof(s->buffer), "CONNECT %s HTTP/1.1\r\n" "Host: %s\r\n" "Connection: close\r\n" "%s%s" "\r\n", path, hoststr, authstr ? "Proxy-" : "", authstr ? authstr : ""); av_freep(&authstr); if ((ret = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0) goto fail; s->buf_ptr = s->buffer; s->buf_end = s->buffer; s->line_count = 0; s->filesize = -1; cur_auth_type = s->proxy_auth_state.auth_type; for (;;) { int new_loc; // Note: This uses buffering, potentially reading more than the // HTTP header. If tunneling a protocol where the server starts // the conversation, we might buffer part of that here, too. // Reading that requires using the proper ffurl_read() function // on this URLContext, not using the fd directly (as the tls // protocol does). This shouldn't be an issue for tls though, // since the client starts the conversation there, so there // is no extra data that we might buffer up here. if (http_get_line(s, line, sizeof(line)) < 0) { ret = AVERROR(EIO); goto fail; } av_dlog(h, "header='%s'\n", line); ret = process_line(h, line, s->line_count, &new_loc); if (ret < 0) goto fail; if (ret == 0) break; s->line_count++; } if (s->http_code == 407 && cur_auth_type == HTTP_AUTH_NONE && s->proxy_auth_state.auth_type != HTTP_AUTH_NONE) { ffurl_close(s->hd); s->hd = NULL; goto redo; } if (s->http_code < 400) return 0; ret = AVERROR(EIO); fail: http_proxy_close(h); return ret; } static int http_proxy_write(URLContext *h, const uint8_t *buf, int size) { HTTPContext *s = h->priv_data; return ffurl_write(s->hd, buf, size); } URLProtocol ff_httpproxy_protocol = { .name = "httpproxy", .url_open = http_proxy_open, .url_read = http_buf_read, .url_write = http_proxy_write, .url_close = http_proxy_close, .url_get_file_handle = http_get_file_handle, .priv_data_size = sizeof(HTTPContext), .flags = URL_PROTOCOL_FLAG_NETWORK, }; #endif