r12902@catbus: nickm | 2007-05-22 14:52:29 -0400

First draft of code to generate votes. needs testing. does not yet upload or serve votes. Shares most of its code with the old generate_v2_networkstatus. svn:r10295
2024-11-24 12:23:32 +01:00 · 2007-05-22 18:52:32 +00:00 · 2007-05-22 18:52:32 +00:00 · 38300735cd
commit 38300735cd
parent 9e0acc0c11
5 changed files with 181 additions and 50 deletions
--- a/doc/TODO
+++ b/doc/TODO
@ -76,7 +76,7 @@ Things we'd like to do in 0.2.0.x:
          - Serve list as needed.
          o Avoid double-checking signatures every time we get a vote.
          - Warn about expired stuff.
-        - Code to generate votes
+        o Code to generate votes
        - Code to generate consensus from a list of votes
        - Add a signature to a consensus.
        - Code to check signatures on a consensus
--- a/src/or/dirserv.c
+++ b/src/or/dirserv.c
@ -1414,6 +1414,10 @@ dirserv_get_runningrouters(const char **rr, int compress)
 /** For authoritative directories: the current (v2) network status. */
 static cached_dir_t *the_v2_networkstatus = NULL;

+/** For authoritative directories: out most recent vote for the (v3) network
+ * status */
+static cached_dir_t *the_v3_networkstatus_vote = NULL;
+
 /** Return true iff our opinion of the routers has been stale for long
 * enough that we should generate a new v2 network status doc. */
 static int
@ -1602,7 +1606,7 @@ routerstatus_format_entry(char *buf, size_t buf_len,
                   ipaddr,
                   (int)rs->or_port,
                   (int)rs->dir_port,
-
+                   /* These must stay in alphabetical order. */
                   f_authority?" Authority":"",
                   rs->is_bad_exit?" BadExit":"",
                   rs->is_exit?" Exit":"",
@ -1641,11 +1645,21 @@ routerstatus_format_entry(char *buf, size_t buf_len,
  return 0;
 }

+/** DOCDOC */
+static int
+_compare_routerinfo_by_id_digest(const void **a, const void **b)
+{
+  routerinfo_t *first = *(routerinfo_t **)a, *second = *(routerinfo_t **)b;
+  return memcmp(first->cache_info.identity_digest,
+                second->cache_info.identity_digest,
+                DIGEST_LEN);
+}
+
 /** For v2 authoritative directories only: replace the contents of
 * <b>the_v2_networkstatus</b> with a newly generated network status
- * object. */
+ * object. DOCDOC v2*/
 static cached_dir_t *
-generate_v2_networkstatus(void)
+generate_networkstatus_opinion(int v2)
 {
 /** Longest status flag name that we generate. */
 #define LONGEST_STATUS_FLAG_NAME_LEN 9
@ -1671,7 +1685,7 @@ generate_v2_networkstatus(void)
  char digest[DIGEST_LEN];
  struct in_addr in;
  uint32_t addr;
-  crypto_pk_env_t *private_key = get_identity_key();
+  crypto_pk_env_t *private_key;
  routerlist_t *rl = router_get_routerlist();
  time_t now = time(NULL);
  time_t cutoff = now - ROUTER_MAX_AGE_TO_PUBLISH;
@ -1680,6 +1694,20 @@ generate_v2_networkstatus(void)
  int listbadexits = options->AuthDirListBadExits;
  int exits_can_be_guards;
  const char *contact;
+  authority_cert_t *cert = NULL;
+  char *version_lines = NULL;
+  smartlist_t *routers = NULL;
+
+  if (v2) {
+    private_key = get_identity_key();
+  } else {
+    private_key = get_my_v3_authority_signing_key();
+    cert = get_my_v3_authority_cert();
+    if (!private_key || !cert) {
+      log_warn(LD_NET, "Didn't find key/certificate to generate v3 vote");
+      goto done;
+    }
+  }

  if (resolve_my_address(LOG_WARN, options, &addr, &hostname)<0) {
    log_warn(LD_NET, "Couldn't resolve my hostname");
@ -1699,20 +1727,39 @@ generate_v2_networkstatus(void)
    goto done;
  }

+  if (v2) {
    if (crypto_pk_get_fingerprint(private_key, fingerprint, 0)<0) {
      log_err(LD_BUG, "Error computing fingerprint");
      goto done;
    }
+  } else {
+    base16_encode(fingerprint, sizeof(fingerprint),
+                  cert->cache_info.identity_digest, DIGEST_LEN);
+  }

  contact = get_options()->ContactInfo;
  if (!contact)
    contact = "(none)";

-  len = 2048+strlen(client_versions)+strlen(server_versions);
+  if (versioning) {
+    size_t v_len = 32+strlen(client_versions)+strlen(server_versions);
+    version_lines = tor_malloc(v_len);
+    tor_snprintf(version_lines, v_len,
+                 "client-versions %s\nserver-versions %s\n",
+                 client_versions, server_versions);
+  } else {
+    version_lines = tor_strdup("");
+  }
+
+  len = 4096+strlen(client_versions)+strlen(server_versions);
  len += identity_pkey_len*2;
  len += (RS_ENTRY_LEN)*smartlist_len(rl->routers);
+  if (!v2) {
+    len += cert->cache_info.signed_descriptor_len;
+  }

  status = tor_malloc(len);
+  if (v2) {
    tor_snprintf(status, len,
               "network-status-version 2\n"
               "dir-source %s %s %d\n"
@ -1720,8 +1767,7 @@ generate_v2_networkstatus(void)
               "contact %s\n"
               "published %s\n"
               "dir-options%s%s%s\n"
-               "%s%s" /* client versions %s */
-               "%s%s%s" /* \nserver versions %s \n */
+               "%s" /* client version line, server version line. */
               "dir-signing-key\n%s\n",
               hostname, ipaddr, (int)options->DirPort,
               fingerprint,
@ -1730,14 +1776,38 @@ generate_v2_networkstatus(void)
               naming ? " Names" : "",
               listbadexits ? " BadExits" : "",
               versioning ? " Versions" : "",
-               versioning ? "client-versions " : "",
-               versioning ? client_versions : "",
-               versioning ? "\nserver-versions " : "",
-               versioning ? server_versions : "",
-               versioning ? "\n" : "",
+               version_lines,
               identity_pkey);
    outp = status + strlen(status);
    endp = status + len;
+  } else {
+    tor_snprintf(status, len,
+                 "network-status-version 3\n"
+                 "vote-status vote\n"
+                 "published %s\n"
+                 "valid-after %s\n"
+                 "valid-until %s\n"
+                 "%s" /* versions */
+                 "known-flags Authority Exit Fast Guard Stable "
+                               "Running Valid V2Dir%s%s\n"
+                 "dir-source %s %s %s %s %d\n"
+                 "contact %s\n",
+                 published,
+                 published, /* XXXX020 should be valid-after*/
+                 published, /* XXXX020 should be valid-until*/
+                 version_lines,
+                 naming ? " Named" : "",
+                 listbadexits ? " BadExit" : "",
+                 options->Nickname, fingerprint, options->Address,
+                    ipaddr, (int)options->DirPort,
+                 contact);
+    outp = status + strlen(status);
+    endp = status + len;
+    tor_assert(outp + cert->cache_info.signed_descriptor_len < endp);
+    memcpy(outp, cert->cache_info.signed_descriptor_body,
+           cert->cache_info.signed_descriptor_len);
+    outp += cert->cache_info.signed_descriptor_len;
+  }

  /* precompute this part, since we need it to decide what "stable"
   * means. */
@ -1751,7 +1821,11 @@ generate_v2_networkstatus(void)
   * total_exit_bandwidth is close to total_bandwidth/3. */
  exits_can_be_guards = total_exit_bandwidth >= (total_bandwidth / 3);

-  SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ri, {
+  routers = smartlist_create();
+  smartlist_add_all(routers, rl->routers);
+  smartlist_sort(routers, _compare_routerinfo_by_id_digest);
+
+  SMARTLIST_FOREACH(routers, routerinfo_t *, ri, {
    if (ri->cache_info.published_on >= cutoff) {
      /* Already set by compute_performance_thresholds. */
      int f_exit = ri->is_exit;
@ -1808,16 +1882,36 @@ generate_v2_networkstatus(void)
    }
  });

+  if (v2) {
    if (tor_snprintf(outp, endp-outp, "directory-signature %s\n",
                     get_options()->Nickname)<0) {
      log_warn(LD_BUG, "Unable to write signature line.");
      goto done;
    }
-
    if (router_get_networkstatus_v2_hash(status, digest)<0) {
      log_warn(LD_BUG, "Unable to hash network status");
      goto done;
    }
+    outp += strlen(outp);
+  } else {
+    char hex_digest[HEX_DIGEST_LEN+1];
+    if (tor_snprintf(outp, endp-outp, "directory-signature %s ",
+                     fingerprint)<0) {
+      log_warn(LD_BUG, "Unable to start signature line.");
+      goto done;
+    }
+    if (router_get_networkstatus_v3_hash(status, digest)<0) {
+      log_warn(LD_BUG, "Unable to hash network status vote");
+      goto done;
+    }
+    base16_encode(hex_digest, sizeof(hex_digest), digest, DIGEST_LEN);
+    outp += strlen(outp);
+    if (tor_snprintf(outp, endp-outp, "%s\n", hex_digest)<0) {
+      log_warn(LD_BUG, "Unable to end signature line.");
+      goto done;
+    }
+    outp += strlen(outp);
+  }

  note_crypto_pk_op(SIGN_DIR);
  if (router_append_dirobj_signature(outp,endp-outp,digest,private_key)<0) {
@ -1825,20 +1919,28 @@ generate_v2_networkstatus(void)
    goto done;
  }

-  if (the_v2_networkstatus)
-    cached_dir_decref(the_v2_networkstatus);
-  the_v2_networkstatus = new_cached_dir(status, now);
+  {
+    cached_dir_t **ns_ptr =
+      v2 ? &the_v2_networkstatus : &the_v3_networkstatus_vote;
+    if (*ns_ptr)
+      cached_dir_decref(*ns_ptr);
+    *ns_ptr = new_cached_dir(status, now);
    status = NULL; /* So it doesn't get double-freed. */
+    if (v2)
      the_v2_networkstatus_is_dirty = 0;
-  router_set_networkstatus(the_v2_networkstatus->dir,
-                           now, NS_GENERATED, NULL);
-  r = the_v2_networkstatus;
+    router_set_networkstatus((*ns_ptr)->dir, now, NS_GENERATED, NULL);
+    r = *ns_ptr;
+  }
+
 done:
  tor_free(client_versions);
  tor_free(server_versions);
+  tor_free(version_lines);
  tor_free(status);
  tor_free(hostname);
  tor_free(identity_pkey);
+  if (routers)
+    smartlist_free(routers);
  return r;
 }

@ -1855,7 +1957,7 @@ dirserv_get_networkstatus_v2_fingerprints(smartlist_t *result,
    cached_v2_networkstatus = digestmap_new();

  if (should_generate_v2_networkstatus())
-    generate_v2_networkstatus();
+    generate_networkstatus_opinion(1);

  if (!strcmp(key,"authority")) {
    if (authdir_mode_v2(get_options())) {
@ -1910,7 +2012,7 @@ dirserv_get_networkstatus_v2(smartlist_t *result,
  SMARTLIST_FOREACH(fingerprints, const char *, fp,
    {
      if (router_digest_is_me(fp) && should_generate_v2_networkstatus())
-        generate_v2_networkstatus();
+        generate_networkstatus_opinion(1);
      cached = digestmap_get(cached_v2_networkstatus, fp);
      if (cached) {
        smartlist_add(result, cached);
--- a/src/or/or.h
+++ b/src/or/or.h
@ -2994,6 +2994,8 @@ time_t get_onion_key_set_at(void);
 void set_identity_key(crypto_pk_env_t *k);
 crypto_pk_env_t *get_identity_key(void);
 int identity_key_is_set(void);
+authority_cert_t *get_my_v3_authority_cert(void);
+crypto_pk_env_t *get_my_v3_authority_signing_key(void);
 void dup_onion_keys(crypto_pk_env_t **key, crypto_pk_env_t **last);
 void rotate_onion_key(void);
 crypto_pk_env_t *init_key_from_file(const char *fname);
@ -3258,6 +3260,7 @@ int router_get_router_hash(const char *s, char *digest);
 int router_get_dir_hash(const char *s, char *digest);
 int router_get_runningrouters_hash(const char *s, char *digest);
 int router_get_networkstatus_v2_hash(const char *s, char *digest);
+int router_get_networkstatus_v3_hash(const char *s, char *digest);
 int router_get_extrainfo_hash(const char *s, char *digest);
 int router_append_dirobj_signature(char *buf, size_t buf_len,
                                   const char *digest,
--- a/src/or/router.c
+++ b/src/or/router.c
@ -122,6 +122,20 @@ identity_key_is_set(void)
  return identitykey != NULL;
 }

+/** DOCDOC */
+authority_cert_t *
+get_my_v3_authority_cert(void)
+{
+  return authority_key_certificate;
+}
+
+/** DOCDOC */
+crypto_pk_env_t *
+get_my_v3_authority_signing_key(void)
+{
+  return authority_signing_key;
+}
+
 /** Replace the previous onion key with the current onion key, and generate
 * a new previous onion key.  Immediately after calling this function,
 * the OR should:
--- a/src/or/routerparse.c
+++ b/src/or/routerparse.c
@ -352,7 +352,8 @@ static addr_policy_t *router_parse_addr_policy(directory_token_t *tok);
 static addr_policy_t *router_parse_addr_policy_private(directory_token_t *tok);

 static int router_get_hash_impl(const char *s, char *digest,
-                                const char *start_str, const char *end_str);
+                                const char *start_str, const char *end_str,
+                                char end_char);
 static void token_free(directory_token_t *tok);
 static smartlist_t *find_all_exitpolicy(smartlist_t *s);
 static directory_token_t *find_first_by_keyword(smartlist_t *s,
@ -377,7 +378,7 @@ int
 router_get_dir_hash(const char *s, char *digest)
 {
  return router_get_hash_impl(s,digest,
-                              "signed-directory","\ndirectory-signature");
+                              "signed-directory","\ndirectory-signature",'\n');
 }

 /** Set <b>digest</b> to the SHA-1 digest of the hash of the first router in
@ -387,7 +388,7 @@ int
 router_get_router_hash(const char *s, char *digest)
 {
  return router_get_hash_impl(s,digest,
-                              "router ","\nrouter-signature");
+                              "router ","\nrouter-signature", '\n');
 }

 /** Set <b>digest</b> to the SHA-1 digest of the hash of the running-routers
@ -397,7 +398,7 @@ int
 router_get_runningrouters_hash(const char *s, char *digest)
 {
  return router_get_hash_impl(s,digest,
-                              "network-status","\ndirectory-signature");
+                              "network-status","\ndirectory-signature", '\n');
 }

 /** Set <b>digest</b> to the SHA-1 digest of the hash of the network-status
@ -406,7 +407,18 @@ int
 router_get_networkstatus_v2_hash(const char *s, char *digest)
 {
  return router_get_hash_impl(s,digest,
-                            "network-status-version","\ndirectory-signature");
+                              "network-status-version","\ndirectory-signature",
+                              '\n');
+}
+
+/** Set <b>digest</b> to the SHA-1 digest of the hash of the network-status
+ * string in <b>s</b>.  Return 0 on success, -1 on failure. */
+int
+router_get_networkstatus_v3_hash(const char *s, char *digest)
+{
+  return router_get_hash_impl(s,digest,
+                              "network-status-version","\ndirectory-signature",
+                              ' ');
 }

 /** Set <b>digest</b> to the SHA-1 digest of the hash of the extrainfo
@ -414,7 +426,7 @@ router_get_networkstatus_v2_hash(const char *s, char *digest)
 int
 router_get_extrainfo_hash(const char *s, char *digest)
 {
-  return router_get_hash_impl(s,digest,"extra-info","\nrouter-signature");
+  return router_get_hash_impl(s,digest,"extra-info","\nrouter-signature",'\n');
 }

 /** Helper: used to generate signatures for routers, directories and
@ -1317,7 +1329,7 @@ authority_cert_parse_from_string(const char *s, const char **end_of_string)
    goto err;
  }
  if (router_get_hash_impl(s, digest, "dir-key-certificate-version",
-                           "\ndir-key-certification") < 0)
+                           "\ndir-key-certification", '\n') < 0)
    goto err;
  tok = smartlist_get(tokens, 0);
  if (tok->tp != K_DIR_KEY_CERTIFICATE_VERSION || strcmp(tok->args[0], "3")) {
@ -2215,8 +2227,8 @@ find_all_exitpolicy(smartlist_t *s)
 }

 /** Compute the SHA-1 digest of the substring of <b>s</b> taken from the first
- * occurrence of <b>start_str</b> through the first newline after the first
- * subsequent occurrence of <b>end_str</b>; store the 20-byte result in
+ * occurrence of <b>start_str</b> through the first instance of c after the
+ * first subsequent occurrence of <b>end_str</b>; store the 20-byte result in
 * <b>digest</b>; return 0 on success.
 *
 * If no such substring exists, return -1.
@ -2224,7 +2236,7 @@ find_all_exitpolicy(smartlist_t *s)
 static int
 router_get_hash_impl(const char *s, char *digest,
                     const char *start_str,
-                     const char *end_str)
+                     const char *end_str, char end_c)
 {
  char *start, *end;
  start = strstr(s, start_str);
@ -2243,7 +2255,7 @@ router_get_hash_impl(const char *s, char *digest,
    log_warn(LD_DIR,"couldn't find end of hashed material \"%s\"",end_str);
    return -1;
  }
-  end = strchr(end+strlen(end_str), '\n');
+  end = strchr(end+strlen(end_str), end_c);
  if (!end) {
    log_warn(LD_DIR,"couldn't find EOL");
    return -1;