tor --list-fingerprint to print fingerprint and exit

svn:r2627

3 files changed, 60 insertions, 11 deletions

diff --git a/src/or/config.c b/src/or/config.c
index 7b366f5593..7dd83aa8dc 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -184,6 +184,8 @@ config_get_commandlines(int argc, char **argv)
 //      log(LOG_DEBUG,"Commandline: skipping over -f.");
       i += 2; /* this is the config file option. ignore it. */
       continue;
+    } else if (!strcmp(argv[i],"--list-fingerprint")) {
+      i += 1; /* command-line option. ignore it. */
     }
 
     new = tor_malloc(sizeof(struct config_line_t));
@@ -726,19 +728,27 @@ getconfig(int argc, char **argv, or_options_t *options)
     exit(0);
   }
 
-/* learn config file name, get config lines, assign them */
-  i = 1;
-  while (i < argc-1 && strcmp(argv[i],"-f")) {
-    i++;
+  /* learn config file name, get config lines, assign them */
+  fname = NULL;
+  using_default_torrc = 1;
+  options->command = CMD_RUN_TOR;
+  for (i = 1; i < argc; ++i) {
+    if (i < argc-1 && !strcmp(argv[i],"-f")) {
+      if (fname) {
+        log(LOG_WARN, "Duplicate -f options on command line.");
+        tor_free(fname);
+      }
+      fname = tor_strdup(argv[i+1]);
+      using_default_torrc = 0;
+      ++i;
+    } else if (!strcmp(argv[i],"--list-fingerprint")) {
+      options->command = CMD_LIST_FINGERPRINT;
+    }      
   }
 
-  if (i < argc-1) { /* we found one */
-    fname = tor_strdup(argv[i+1]);
-    using_default_torrc = 0;
-  } else {
+  if (using_default_torrc) {
     /* didn't find one, try CONFDIR */
     char *fn;
-    using_default_torrc = 1;
     fn = get_default_conf_file();
     if (fn && file_status(fn) == FN_FILE) {
       fname = fn;
diff --git a/src/or/main.c b/src/or/main.c
index a85ab53afb..b0b9792f56 100644
--- a/src/or/main.c
+++ b/src/or/main.c
@@ -706,6 +706,11 @@ static int init_from_config(int argc, char **argv) {
     return -1;
   }
 
+  /* Bail out at this point if we're not going to be a server: we want
+   * to not fork, and to log stuff to stderr. */
+  if (options.command != CMD_RUN_TOR)
+    return 0;
+
   /* Configure the log(s) */
   if (config_init_logs(&options)<0)
     return -1;
@@ -1095,11 +1100,31 @@ static int tor_init(int argc, char *argv[]) {
 void tor_cleanup(void) {
   /* Remove our pid file. We don't care if there was an error when we
    * unlink, nothing we could do about it anyways. */
-  if(options.PidFile)
+  if(options.PidFile && options.command == CMD_RUN_TOR)
     unlink(options.PidFile);
   crypto_global_cleanup();
 }
 
+/** Read/create keys as needed, and echo our fingerprint to stdout. */
+void do_list_fingerprint(void)
+{
+  char buf[FINGERPRINT_LEN+1];
+  crypto_pk_env_t *k;
+  if (init_keys() < 0) {
+    log_fn(LOG_ERR,"Error initializing keys; exiting");
+    return;
+  }
+  if (!(k = get_identity_key())) {
+    log_fn(LOG_ERR,"Error: missing identity key.");
+    return;
+  }    
+  if (crypto_pk_get_fingerprint(k, buf, 1)<0) {
+    log_fn(LOG_ERR, "Error computing fingerprint");
+    return;
+  }
+  printf("%s %s\n", options.Nickname, buf);
+}
+
 #ifdef MS_WINDOWS_SERVICE
 void nt_service_control(DWORD request)
 {
@@ -1169,7 +1194,17 @@ int tor_main(int argc, char *argv[]) {
 #else
   if (tor_init(argc, argv)<0)
     return -1;
-  do_main_loop();
+  switch (options.command) {
+  case CMD_RUN_TOR:
+    do_main_loop();
+    break;
+  case CMD_LIST_FINGERPRINT:
+    do_list_fingerprint();
+    break;
+  default:
+    log_fn(LOG_ERR, "Illegal command number %d: internal error.",
+           options.command);
+  }
   tor_cleanup();
   return -1;
 #endif
diff --git a/src/or/or.h b/src/or/or.h
index 4f2aee9c40..6a36516f66 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -832,6 +832,10 @@ typedef struct exit_redirect_t {
 
 /** Configuration options for a Tor process */
 typedef struct {
+  /** What should the tor process actually do? */
+  enum {
+    CMD_RUN_TOR=0, CMD_LIST_FINGERPRINT
+  } command;
   struct config_line_t *LogOptions; /**< List of configuration lines
                                      * for logfiles */