diff options
Diffstat (limited to 'libs/libcurl/src/httpsrr.c')
| -rw-r--r-- | libs/libcurl/src/httpsrr.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/libs/libcurl/src/httpsrr.c b/libs/libcurl/src/httpsrr.c new file mode 100644 index 0000000000..7c50536cc5 --- /dev/null +++ b/libs/libcurl/src/httpsrr.c @@ -0,0 +1,167 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#ifdef USE_HTTPSRR
+
+#include "urldata.h"
+#include "curl_addrinfo.h"
+#include "httpsrr.h"
+#include "connect.h"
+#include "sendf.h"
+
+/* The last 3 #include files should be in this order */
+#include "curl_printf.h"
+#include "curl_memory.h"
+#include "memdebug.h"
+
+CURLcode Curl_httpsrr_decode_alpn(const unsigned char *cp, size_t len,
+ unsigned char *alpns)
+{
+ /*
+ * spec here is as per RFC 9460, section-7.1.1
+ * encoding is a concatenated list of strings each preceded by a one
+ * octet length
+ * output is comma-sep list of the strings
+ * implementations may or may not handle quoting of comma within
+ * string values, so we might see a comma within the wire format
+ * version of a string, in which case we will precede that by a
+ * backslash - same goes for a backslash character, and of course
+ * we need to use two backslashes in strings when we mean one;-)
+ */
+ struct dynbuf dval;
+ int idnum = 0;
+
+ Curl_dyn_init(&dval, DYN_DOH_RESPONSE);
+ while(len > 0) {
+ size_t tlen = (size_t) *cp++;
+ size_t i;
+ enum alpnid id;
+ len--;
+ if(tlen > len)
+ goto err;
+ /* add escape char if needed, clunky but easier to read */
+ for(i = 0; i != tlen; i++) {
+ if('\\' == *cp || ',' == *cp) {
+ if(Curl_dyn_addn(&dval, "\\", 1))
+ goto err;
+ }
+ if(Curl_dyn_addn(&dval, cp++, 1))
+ goto err;
+ }
+ len -= tlen;
+
+ /* we only store ALPN ids we know about */
+ id = Curl_alpn2alpnid(Curl_dyn_ptr(&dval), Curl_dyn_len(&dval));
+ if(id != ALPN_none) {
+ if(idnum == MAX_HTTPSRR_ALPNS)
+ break;
+ alpns[idnum++] = (unsigned char)id;
+ }
+ Curl_dyn_reset(&dval);
+ }
+ Curl_dyn_free(&dval);
+ if(idnum < MAX_HTTPSRR_ALPNS)
+ alpns[idnum] = ALPN_none; /* terminate the list */
+ return CURLE_OK;
+err:
+ Curl_dyn_free(&dval);
+ return CURLE_BAD_CONTENT_ENCODING;
+}
+
+#ifdef USE_ARES
+
+static void httpsrr_opt(struct Curl_easy *data,
+ const ares_dns_rr_t *rr,
+ ares_dns_rr_key_t key, size_t idx)
+{
+ size_t len = 0;
+ const unsigned char *val = NULL;
+ unsigned short code;
+ struct thread_data *res = data->state.async.tdata;
+ struct Curl_https_rrinfo *hi = &res->hinfo;
+ code = ares_dns_rr_get_opt(rr, key, idx, &val, &len);
+
+ switch(code) {
+ case HTTPS_RR_CODE_ALPN: /* str_list */
+ Curl_httpsrr_decode_alpn(val, len, hi->alpns);
+ infof(data, "HTTPS RR ALPN: %u %u %u %u",
+ hi->alpns[0], hi->alpns[1], hi->alpns[2], hi->alpns[3]);
+ break;
+ case HTTPS_RR_CODE_NO_DEF_ALPN:
+ infof(data, "HTTPS RR no-def-alpn");
+ break;
+ case HTTPS_RR_CODE_IPV4: /* addr4 list */
+ infof(data, "HTTPS RR IPv4");
+ break;
+ case HTTPS_RR_CODE_ECH:
+ infof(data, "HTTPS RR ECH");
+ break;
+ case HTTPS_RR_CODE_IPV6: /* addr6 list */
+ infof(data, "HTTPS RR IPv6");
+ break;
+ case HTTPS_RR_CODE_PORT:
+ infof(data, "HTTPS RR port");
+ break;
+ default:
+ infof(data, "HTTPS RR unknown code");
+ break;
+ }
+}
+
+void Curl_dnsrec_done_cb(void *arg, ares_status_t status,
+ size_t timeouts,
+ const ares_dns_record_t *dnsrec)
+{
+ struct Curl_easy *data = arg;
+ size_t i;
+#ifdef CURLRES_ARES
+ struct thread_data *res = data->state.async.tdata;
+
+ res->num_pending--;
+#endif
+ (void)timeouts;
+ if((ARES_SUCCESS != status) || !dnsrec)
+ return;
+
+ for(i = 0; i < ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER); i++) {
+ size_t opt;
+ const ares_dns_rr_t *rr =
+ ares_dns_record_rr_get_const(dnsrec, ARES_SECTION_ANSWER, i);
+ if(ares_dns_rr_get_type(rr) != ARES_REC_TYPE_HTTPS)
+ continue;
+ /* When SvcPriority is 0, the SVCB record is in AliasMode. Otherwise, it
+ is in ServiceMode */
+ infof(data, "HTTPS RR priority: %u",
+ ares_dns_rr_get_u16(rr, ARES_RR_HTTPS_PRIORITY));
+ for(opt = 0; opt < ares_dns_rr_get_opt_cnt(rr, ARES_RR_HTTPS_PARAMS);
+ opt++)
+ httpsrr_opt(data, rr, ARES_RR_HTTPS_PARAMS, opt);
+ }
+}
+
+#endif /* USE_ARES */
+
+#endif /* USE_HTTPSRR */
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