Emit and parse protocol lists in router descriptors

src/or/or.h

@@ -2073,6 +2073,9 @@ typedef struct {
 
   char *platform; /**< What software/operating system is this OR using? */
 
+  char *protocol_list; /**< Encoded list of subprotocol versions supported
+                        * by this OR */
+
   /* link info */
   uint32_t bandwidthrate; /**< How many bytes does this OR add to its token
                            * bucket per second? */

src/or/router.c

@@ -23,6 +23,7 @@
 #include "networkstatus.h"
 #include "nodelist.h"
 #include "policies.h"
+#include "protover.h"
 #include "relay.h"
 #include "rephist.h"
 #include "router.h"
@@ -2124,6 +2125,8 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
   get_platform_str(platform, sizeof(platform));
   ri->platform = tor_strdup(platform);
 
+  ri->protocol_list = tor_strdup(get_supported_protocols());
+
   /* compute ri->bandwidthrate as the min of various options */
   ri->bandwidthrate = get_effective_bwrate(options);
 
@@ -2616,6 +2619,7 @@ router_dump_router_to_string(routerinfo_t *router,
   char *ed_cert_line = NULL;
   char *rsa_tap_cc_line = NULL;
   char *ntor_cc_line = NULL;
+  char *proto_line = NULL;
 
   /* Make sure the identity key matches the one in the routerinfo. */
   if (!crypto_pk_eq_keys(ident_key, router->identity_pkey)) {
@@ -2780,6 +2784,12 @@ router_dump_router_to_string(routerinfo_t *router,
     }
   }
 
+  if (router->protocol_list) {
+    tor_asprintf(&proto_line, "proto %s\n", router->protocol_list);
+  } else {
+    proto_line = tor_strdup("");
+  }
+
   address = tor_dup_ip(router->addr);
   chunks = smartlist_new();
 
@@ -2789,7 +2799,7 @@ router_dump_router_to_string(routerinfo_t *router,
                     "%s"
                     "%s"
                     "platform %s\n"
-                    "protocols Link 1 2 Circuit 1\n"
+                    "%s"
                     "published %s\n"
                     "fingerprint %s\n"
                     "uptime %ld\n"
@@ -2806,6 +2816,7 @@ router_dump_router_to_string(routerinfo_t *router,
     ed_cert_line ? ed_cert_line : "",
     extra_or_address ? extra_or_address : "",
     router->platform,
+    proto_line,
     published,
     fingerprint,
     stats_n_seconds_working,

src/or/routerlist.c

@@ -3102,6 +3102,7 @@ routerinfo_free(routerinfo_t *router)
   tor_free(router->cache_info.signed_descriptor_body);
   tor_free(router->nickname);
   tor_free(router->platform);
+  tor_free(router->protocol_list);
   tor_free(router->contact_info);
   if (router->onion_pkey)
     crypto_pk_free(router->onion_pkey);

src/or/routerparse.c

@@ -58,6 +58,7 @@ typedef enum {
   K_RUNNING_ROUTERS,
   K_ROUTER_STATUS,
   K_PLATFORM,
+  K_PROTO,
   K_OPT,
   K_BANDWIDTH,
   K_CONTACT,
@@ -306,6 +307,7 @@ static token_rule_t routerdesc_token_table[] = {
   T01("fingerprint",         K_FINGERPRINT,     CONCAT_ARGS, NO_OBJ ),
   T01("hibernating",         K_HIBERNATING,         GE(1),   NO_OBJ ),
   T01("platform",            K_PLATFORM,        CONCAT_ARGS, NO_OBJ ),
+  T01("proto",               K_PROTO,           CONCAT_ARGS, NO_OBJ ),
   T01("contact",             K_CONTACT,         CONCAT_ARGS, NO_OBJ ),
   T01("read-history",        K_READ_HISTORY,        ARGS,    NO_OBJ ),
   T01("write-history",       K_WRITE_HISTORY,       ARGS,    NO_OBJ ),
@@ -2092,6 +2094,10 @@ router_parse_entry_from_string(const char *s, const char *end,
     router->platform = tor_strdup(tok->args[0]);
   }
 
+  if ((tok = find_opt_by_keyword(tokens, K_PROTO))) {
+    router->protocol_list = tor_strdup(tok->args[0]);
+  }
+
   if ((tok = find_opt_by_keyword(tokens, K_CONTACT))) {
     router->contact_info = tor_strdup(tok->args[0]);
   }

src/test/test_dir.c

@@ -231,7 +231,6 @@ test_dir_formats(void *arg)
           "platform Tor "VERSION" on ", sizeof(buf2));
   strlcat(buf2, get_uname(), sizeof(buf2));
   strlcat(buf2, "\n"
-          "protocols Link 1 2 Circuit 1\n"
           "published 1970-01-01 00:00:00\n"
           "fingerprint ", sizeof(buf2));
   tt_assert(!crypto_pk_get_fingerprint(pk2, fingerprint, 1));
@@ -300,7 +299,6 @@ test_dir_formats(void *arg)
   strlcat(buf2, "platform Tor "VERSION" on ", sizeof(buf2));
   strlcat(buf2, get_uname(), sizeof(buf2));
   strlcat(buf2, "\n"
-          "protocols Link 1 2 Circuit 1\n"
           "published 1970-01-01 00:00:05\n"
           "fingerprint ", sizeof(buf2));
   tt_assert(!crypto_pk_get_fingerprint(pk1, fingerprint, 1));