r12406@catbus: nickm | 2007-04-16 14:39:33 -0400

More proposal-104 stuff: add most of the code for authorities to accept and serve extra-info documents.  The back-end to store the things is missing.


svn:r9971

doc/TODO

@@ -56,9 +56,12 @@ Things we'd like to do in 0.2.0.x:
     - 101: Voting on the Tor Directory System
     . 104: Long and Short Router Descriptors (by Jun 1)
       . Finalize proposal
-      - Implement parsing for extra-info documents; have authorities
-        accept them and serve them from specified URLs
-      - Have routers generate and upload extra-info documents.
+      o Implement parsing for extra-info documents
+      o Have routers generate extra-info documents.
+      . Have have authorities accept them and serve them from specified URLs
+        o Implement directory-protocol side.
+        - Implement storage.
+      - Have routers upload extra-info documents.
       - Implement option to download and cache extra-info documents.
       - Drop bandwidth history from router-descriptors
     - 105: Version negotiation for the Tor protocol (finalize by Jun 1)

src/or/directory.c

@@ -1683,31 +1683,34 @@ directory_handle_command_get(dir_connection_t *conn, const char *headers,
     return 0;
   }
 
-  if (!strcmpstart(url,"/tor/server/")) {
+  if (!strcmpstart(url,"/tor/server/") ||
+      !strcmpstart(url,"/tor/extra/")) {
     size_t url_len = strlen(url);
     int deflated = !strcmp(url+url_len-2, ".z");
     int res;
     const char *msg;
     const char *request_type = NULL;
     int cache_lifetime = 0;
+    int is_extra = !strcmpstart(url,"/tor/extra/");
     if (deflated)
       url[url_len-2] = '\0';
+    url += is_extra ? strlen("/tor/extra/") : strlen("/tor/server/");
     conn->fingerprint_stack = smartlist_create();
     res = dirserv_get_routerdesc_fingerprints(conn->fingerprint_stack, url,
                                               &msg);
 
-    if (!strcmpstart(url, "/tor/server/fp/")) {
+    if (!strcmpstart(url, "fp/")) {
       request_type = deflated?"/tor/server/fp.z":"/tor/server/fp";
       if (smartlist_len(conn->fingerprint_stack) == 1)
         cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
-    } else if (!strcmpstart(url, "/tor/server/authority")) {
+    } else if (!strcmpstart(url, "authority")) {
       request_type = deflated?"/tor/server/authority.z":
         "/tor/server/authority";
       cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
-    } else if (!strcmpstart(url, "/tor/server/all")) {
+    } else if (!strcmpstart(url, "all")) {
       request_type = deflated?"/tor/server/all.z":"/tor/server/all";
       cache_lifetime = FULL_DIR_CACHE_LIFETIME;
-    } else if (!strcmpstart(url, "/tor/server/d/")) {
+    } else if (!strcmpstart(url, "d/")) {
       request_type = deflated?"/tor/server/d.z":"/tor/server/d";
       if (smartlist_len(conn->fingerprint_stack) == 1)
         cache_lifetime = ROUTERDESC_BY_DIGEST_CACHE_LIFETIME;
@@ -1715,10 +1718,12 @@ directory_handle_command_get(dir_connection_t *conn, const char *headers,
       request_type = "/tor/server/?";
     }
     (void) request_type; /* usable for note_request. */
-    if (!strcmpstart(url, "/tor/server/d/"))
-      conn->dir_spool_src = DIR_SPOOL_SERVER_BY_DIGEST;
+    if (!strcmpstart(url, "d/"))
+      conn->dir_spool_src =
+        is_extra ? DIR_SPOOL_EXTRA_BY_DIGEST : DIR_SPOOL_SERVER_BY_DIGEST;
     else
-      conn->dir_spool_src = DIR_SPOOL_SERVER_BY_FP;
+      conn->dir_spool_src =
+        is_extra ? DIR_SPOOL_EXTRA_BY_FP : DIR_SPOOL_SERVER_BY_FP;
     tor_free(url);
     if (res < 0)
       write_http_status_line(conn, 404, msg);

src/or/dirserv.c

@@ -537,8 +537,36 @@ dirserv_add_descriptor(const char *desc, const char **msg)
 {
   int r;
   routerinfo_t *ri = NULL, *ri_old = NULL;
+  extrainfo_t *ei = NULL;
   tor_assert(msg);
   *msg = NULL;
+  desc = eat_whitespace(desc);
+
+  if (!strcmpstart(desc, "extra-info")) {
+    /* It's an extra-info thingie. */
+    routerlist_t *rl = router_get_routerlist();
+    ei = extrainfo_parse_entry_from_string(desc, NULL, 1, rl->identity_map);
+    if (!ei) {
+      log_warn(LD_DIRSERV, "Couldn't parse uploaded extra-info descriptor");
+      *msg = "Rejected: couldn't parse extra-info descriptor";
+      return -2;
+    }
+    ri = router_get_by_digest(ei->cache_info.identity_digest);
+    if (!ri) {
+      *msg = "No corresponding router descriptor for extra-info descriptor";
+      extrainfo_free(ei);
+      return -1;
+    }
+    if (routerinfo_incompatible_with_extrainfo(ri, ei)) {
+      *msg = "Router descriptor incompatible with extra-info descriptor";
+      extrainfo_free(ei);
+      return -1;
+    }
+    /* XXXX020 Eventually, we should store this.  For now, we'll just
+     * discard it. */
+    extrainfo_free(ei);
+    return 2;
+  }
 
   /* Check: is the descriptor syntactically valid? */
   ri = router_parse_entry_from_string(desc, NULL, 1);
@@ -1815,8 +1843,9 @@ dirserv_get_networkstatus_v2(smartlist_t *result,
 }
 
 /** As dirserv_get_routerdescs(), but instead of getting signed_descriptor_t
- * pointers, adds copies of digests to fps_out.  For a /tor/server/d/ request,
- * adds descriptor digests; for other requests, adds identity digests.
+ * pointers, adds copies of digests to fps_out, and doesn't use the
+ * /tor/server/ prefix.  For a /d/ request, adds descriptor digests; for other
+ * requests, adds identity digests.
  */
 int
 dirserv_get_routerdesc_fingerprints(smartlist_t *fps_out, const char *key,
@@ -1824,21 +1853,21 @@ dirserv_get_routerdesc_fingerprints(smartlist_t *fps_out, const char *key,
 {
   *msg = NULL;
 
-  if (!strcmp(key, "/tor/server/all")) {
+  if (!strcmp(key, "all")) {
     routerlist_t *rl = router_get_routerlist();
     SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r,
                       smartlist_add(fps_out,
                       tor_memdup(r->cache_info.identity_digest, DIGEST_LEN)));
-  } else if (!strcmp(key, "/tor/server/authority")) {
+  } else if (!strcmp(key, "authority")) {
     routerinfo_t *ri = router_get_my_routerinfo();
     if (ri)
       smartlist_add(fps_out,
                     tor_memdup(ri->cache_info.identity_digest, DIGEST_LEN));
-  } else if (!strcmpstart(key, "/tor/server/d/")) {
-    key += strlen("/tor/server/d/");
+  } else if (!strcmpstart(key, "d/")) {
+    key += strlen("d/");
     dir_split_resource_into_fingerprints(key, fps_out, NULL, 1, 1);
-  } else if (!strcmpstart(key, "/tor/server/fp/")) {
-    key += strlen("/tor/server/fp/");
+  } else if (!strcmpstart(key, "fp/")) {
+    key += strlen("fp/");
     dir_split_resource_into_fingerprints(key, fps_out, NULL, 1, 1);
   } else {
     *msg = "Key not recognized";
@@ -2065,7 +2094,11 @@ connection_dirserv_finish_spooling(dir_connection_t *conn)
 static int
 connection_dirserv_add_servers_to_outbuf(dir_connection_t *conn)
 {
-  int by_fp = conn->dir_spool_src == DIR_SPOOL_SERVER_BY_FP;
+  int by_fp = (conn->dir_spool_src == DIR_SPOOL_SERVER_BY_FP ||
+               conn->dir_spool_src == DIR_SPOOL_EXTRA_BY_FP);
+  int extra = (conn->dir_spool_src == DIR_SPOOL_EXTRA_BY_FP ||
+               conn->dir_spool_src == DIR_SPOOL_EXTRA_BY_DIGEST);
+  time_t publish_cutoff = time(NULL)-ROUTER_MAX_AGE_TO_PUBLISH;
 
   while (smartlist_len(conn->fingerprint_stack) &&
          buf_datalen(conn->_base.outbuf) < DIRSERV_BUFFER_MIN) {
@@ -2074,15 +2107,25 @@ connection_dirserv_add_servers_to_outbuf(dir_connection_t *conn)
     signed_descriptor_t *sd = NULL;
     if (by_fp) {
       if (router_digest_is_me(fp)) {
-        sd = &(router_get_my_routerinfo()->cache_info);
+        if (extra)
+          sd = &(router_get_my_extrainfo()->cache_info);
+        else
+          sd = &(router_get_my_routerinfo()->cache_info);
       } else {
         routerinfo_t *ri = router_get_by_digest(fp);
         if (ri &&
-            ri->cache_info.published_on > time(NULL)-ROUTER_MAX_AGE_TO_PUBLISH)
-          sd = &ri->cache_info;
+            ri->cache_info.published_on > publish_cutoff) {
+          if (extra) {
+            sd = extrainfo_get_by_descriptor_digest(ri->extra_info_digest);
+          } else {
+            sd = &ri->cache_info;
+          }
+        }
       }
-    } else
-      sd = router_get_by_descriptor_digest(fp);
+    } else {
+      sd = extra ? extrainfo_get_by_descriptor_digest(fp)
+        : router_get_by_descriptor_digest(fp);
+    }
     tor_free(fp);
     if (!sd)
       continue;
@@ -2216,6 +2259,8 @@ connection_dirserv_flushed_some(dir_connection_t *conn)
     return 0;
 
   switch (conn->dir_spool_src) {
+    case DIR_SPOOL_EXTRA_BY_DIGEST:
+    case DIR_SPOOL_EXTRA_BY_FP:
     case DIR_SPOOL_SERVER_BY_DIGEST:
     case DIR_SPOOL_SERVER_BY_FP:
       return connection_dirserv_add_servers_to_outbuf(conn);

src/or/or.h

@@ -907,6 +907,7 @@ typedef struct dir_connection_t {
   /** What exactly are we spooling right now? */
   enum {
     DIR_SPOOL_NONE=0, DIR_SPOOL_SERVER_BY_DIGEST, DIR_SPOOL_SERVER_BY_FP,
+    DIR_SPOOL_EXTRA_BY_DIGEST, DIR_SPOOL_EXTRA_BY_FP,
     DIR_SPOOL_CACHED_DIR, DIR_SPOOL_NETWORKSTATUS
   } dir_spool_src : 3;
   /** List of fingerprints for networkstatuses or desriptors to be spooled. */
@@ -2892,7 +2893,7 @@ void check_descriptor_ipaddress_changed(time_t now);
 void router_new_address_suggestion(const char *suggestion);
 int router_compare_to_my_exit_policy(edge_connection_t *conn);
 routerinfo_t *router_get_my_routerinfo(void);
-const char *router_get_my_extrainfo(void);
+extrainfo_t *router_get_my_extrainfo(void);
 const char *router_get_my_descriptor(void);
 int router_digest_is_me(const char *digest);
 int router_is_me(routerinfo_t *router);
@@ -2993,6 +2994,7 @@ routerinfo_t *router_get_by_nickname(const char *nickname,
 routerinfo_t *router_get_by_hexdigest(const char *hexdigest);
 routerinfo_t *router_get_by_digest(const char *digest);
 signed_descriptor_t *router_get_by_descriptor_digest(const char *digest);
+signed_descriptor_t *extrainfo_get_by_descriptor_digest(const char *digest);
 const char *signed_descriptor_get_body(signed_descriptor_t *desc);
 int router_digest_version_as_new_as(const char *digest, const char *cutoff);
 int router_digest_is_trusted_dir(const char *digest);

src/or/router.c

@@ -815,14 +815,14 @@ router_get_my_descriptor(void)
 }
 
 /** DOCDOC */
-const char *
+extrainfo_t *
 router_get_my_extrainfo(void)
 {
   if (!server_mode(get_options()))
     return NULL;
   if (router_rebuild_descriptor(0))
     return NULL;
-  return desc_extrainfo->cache_info.signed_descriptor_body;
+  return desc_extrainfo;
 }
 
 /** A list of nicknames that we've warned about including in our family

src/or/routerlist.c

@@ -1442,6 +1442,15 @@ router_get_by_descriptor_digest(const char *digest)
   return digestmap_get(routerlist->desc_digest_map, digest);
 }
 
+/** DOCDOC */
+signed_descriptor_t *
+extrainfo_get_by_descriptor_digest(const char *digest)
+{
+  /* XXXX020 implement me. */
+  (void)digest;
+  return NULL;
+}
+
 /** Return a pointer to the signed textual representation of a descriptor.
  * The returned string is not guaranteed to be NUL-terminated: the string's
  * length will be in desc-\>signed_descriptor_len. */