diff options
Diffstat (limited to 'dirmngr/ks-engine-http.c')
-rw-r--r-- | dirmngr/ks-engine-http.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/dirmngr/ks-engine-http.c b/dirmngr/ks-engine-http.c new file mode 100644 index 000000000..304e793f7 --- /dev/null +++ b/dirmngr/ks-engine-http.c @@ -0,0 +1,141 @@ +/* ks-engine-http.c - HTTP OpenPGP key access + * Copyright (C) 2011 Free Software Foundation, Inc. + * + * This file is part of GnuPG. + * + * GnuPG is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * GnuPG 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> + +#include "dirmngr.h" +#include "misc.h" +#include "ks-engine.h" + +/* How many redirections do we allow. */ +#define MAX_REDIRECTS 2 + + +/* Get the key from URL which is expected to specify a http style + scheme. On success R_FP has an open stream to read the data. */ +gpg_error_t +ks_http_fetch (ctrl_t ctrl, const char *url, estream_t *r_fp) +{ + gpg_error_t err; + http_t http = NULL; + int redirects_left = MAX_REDIRECTS; + estream_t fp = NULL; + char *request_buffer = NULL; + + *r_fp = NULL; + once_more: + err = http_open (&http, + HTTP_REQ_GET, + url, + /* fixme: AUTH */ NULL, + 0, + /* fixme: proxy*/ NULL, + NULL, NULL, + /*FIXME curl->srvtag*/NULL); + if (!err) + { + fp = http_get_write_ptr (http); + /* Avoid caches to get the most recent copy of the key. We set + both the Pragma and Cache-Control versions of the header, so + we're good with both HTTP 1.0 and 1.1. */ + es_fputs ("Pragma: no-cache\r\n" + "Cache-Control: no-cache\r\n", fp); + http_start_data (http); + if (es_ferror (fp)) + err = gpg_error_from_syserror (); + } + if (err) + { + /* Fixme: After a redirection we show the old host name. */ + log_error (_("error connecting to `%s': %s\n"), + url, gpg_strerror (err)); + goto leave; + } + + /* Wait for the response. */ + dirmngr_tick (ctrl); + err = http_wait_response (http); + if (err) + { + log_error (_("error reading HTTP response for `%s': %s\n"), + url, gpg_strerror (err)); + goto leave; + } + + switch (http_get_status_code (http)) + { + case 200: + err = 0; + break; /* Success. */ + + case 301: + case 302: + { + const char *s = http_get_header (http, "Location"); + + log_info (_("URL `%s' redirected to `%s' (%u)\n"), + url, s?s:"[none]", http_get_status_code (http)); + if (s && *s && redirects_left-- ) + { + xfree (request_buffer); + request_buffer = xtrystrdup (s); + if (request_buffer) + { + url = request_buffer; + http_close (http, 0); + http = NULL; + goto once_more; + } + err = gpg_error_from_syserror (); + } + else + err = gpg_error (GPG_ERR_NO_DATA); + log_error (_("too many redirections\n")); + } + goto leave; + + default: + log_error (_("error accessing `%s': http status %u\n"), + url, http_get_status_code (http)); + err = gpg_error (GPG_ERR_NO_DATA); + goto leave; + } + + fp = http_get_read_ptr (http); + if (!fp) + { + err = gpg_error (GPG_ERR_BUG); + goto leave; + } + + /* Return the read stream and close the HTTP context. */ + *r_fp = fp; + http_close (http, 1); + http = NULL; + + leave: + http_close (http, 0); + xfree (request_buffer); + return err; +} |