otr: add package

otr implements the Off-the-Record messaging protocol from http://www.cypherpunks.ca/otr/. It's often used on IRC and Jabber for private conversations. R=golang-dev, rsc, dchest CC=golang-dev https://golang.org/cl/6300064
golang · Jun 14, 2012 · 929dedf · 929dedf
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diff --git a/otr/libotr_test_helper.c b/otr/libotr_test_helper.c
@@ -0,0 +1,171 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This code can be compiled and used to test the otr package against libotr.
+// See otr_test.go.
+
+// +build ignore
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <proto.h>
+#include <message.h>
+
+static int g_session_established = 0;
+
+OtrlPolicy policy(void *opdata, ConnContext *context) {
+  return OTRL_POLICY_ALWAYS;
+}
+
+int is_logged_in(void *opdata, const char *accountname, const char *protocol, const char *recipient) {
+  return 1;
+}
+
+void inject_message(void *opdata, const char *accountname, const char *protocol, const char *recipient, const char *message) {
+  printf("%s\n", message);
+  fflush(stdout);
+  fprintf(stderr, "libotr helper sent: %s\n", message);
+}
+
+void notify(void *opdata, OtrlNotifyLevel level, const char *accountname, const char *protocol, const char *username, const char *title, const char *primary, const char *secondary) {
+  fprintf(stderr, "NOTIFY: %s %s %s %s\n", username, title, primary, secondary);
+}
+
+int display_otr_message(void *opdata, const char *accountname, const char *protocol, const char *username, const char *msg) {
+  fprintf(stderr, "MESSAGE: %s %s\n", username, msg);
+  return 1;
+}
+
+void update_context_list(void *opdata) {
+}
+
+const char *protocol_name(void *opdata, const char *protocol) {
+        return "PROTOCOL";
+}
+
+void protocol_name_free(void *opdata, const char *protocol_name) {
+}
+
+void new_fingerprint(void *opdata, OtrlUserState us, const char *accountname, const char *protocol, const char *username, unsigned char fingerprint[20]) {
+        fprintf(stderr, "NEW FINGERPRINT\n");
+        g_session_established = 1;
+}
+
+void write_fingerprints(void *opdata) {
+}
+
+void gone_secure(void *opdata, ConnContext *context) {
+}
+
+void gone_insecure(void *opdata, ConnContext *context) {
+}
+
+void still_secure(void *opdata, ConnContext *context, int is_reply) {
+}
+
+void log_message(void *opdata, const char *message) {
+        fprintf(stderr, "MESSAGE: %s\n", message);
+}
+
+int max_message_size(void *opdata, ConnContext *context) {
+  return 99999;
+}
+
+const char *account_name(void *opdata, const char *account, const char *protocol) {
+        return "ACCOUNT";
+}
+
+void account_name_free(void *opdata, const char *account_name) {
+}
+
+OtrlMessageAppOps uiops = {
+  policy,
+  NULL,
+  is_logged_in,
+  inject_message,
+  notify,
+  display_otr_message,
+  update_context_list,
+  protocol_name,
+  protocol_name_free,
+  new_fingerprint,
+  write_fingerprints,
+  gone_secure,
+  gone_insecure,
+  still_secure,
+  log_message,
+  max_message_size,
+  account_name,
+  account_name_free,
+};
+
+static const char kPrivateKeyData[] = "(privkeys (account (name \"account\") (protocol proto) (private-key (dsa (p #00FC07ABCF0DC916AFF6E9AE47BEF60C7AB9B4D6B2469E436630E36F8A489BE812486A09F30B71224508654940A835301ACC525A4FF133FC152CC53DCC59D65C30A54F1993FE13FE63E5823D4C746DB21B90F9B9C00B49EC7404AB1D929BA7FBA12F2E45C6E0A651689750E8528AB8C031D3561FECEE72EBB4A090D450A9B7A857#) (q #00997BD266EF7B1F60A5C23F3A741F2AEFD07A2081#) (g #535E360E8A95EBA46A4F7DE50AD6E9B2A6DB785A66B64EB9F20338D2A3E8FB0E94725848F1AA6CC567CB83A1CC517EC806F2E92EAE71457E80B2210A189B91250779434B41FC8A8873F6DB94BEA7D177F5D59E7E114EE10A49CFD9CEF88AE43387023B672927BA74B04EB6BBB5E57597766A2F9CE3857D7ACE3E1E3BC1FC6F26#) (y #0AC8670AD767D7A8D9D14CC1AC6744CD7D76F993B77FFD9E39DF01E5A6536EF65E775FCEF2A983E2A19BD6415500F6979715D9FD1257E1FE2B6F5E1E74B333079E7C880D39868462A93454B41877BE62E5EF0A041C2EE9C9E76BD1E12AE25D9628DECB097025DD625EF49C3258A1A3C0FF501E3DC673B76D7BABF349009B6ECF#) (x #14D0345A3562C480A039E3C72764F72D79043216#)))))\n";
+
+int
+main() {
+  OTRL_INIT;
+
+  // We have to write the private key information to a file because the libotr
+  // API demands a filename to read from.
+  const char *tmpdir = "/tmp";
+  if (getenv("TMP")) {
+    tmpdir = getenv("TMP");
+  }
+
+  char private_key_file[256];
+  snprintf(private_key_file, sizeof(private_key_file), "%s/libotr_test_helper_privatekeys-XXXXXX", tmpdir);
+  int fd = mkstemp(private_key_file);
+  if (fd == -1) {
+    perror("creating temp file");
+  }
+  write(fd, kPrivateKeyData, sizeof(kPrivateKeyData)-1);
+  close(fd);
+
+  OtrlUserState userstate = otrl_userstate_create();
+  otrl_privkey_read(userstate, private_key_file);
+  unlink(private_key_file);
+
+  fprintf(stderr, "libotr helper started\n");
+
+  char buf[4096];
+
+  for (;;) {
+    char* message = fgets(buf, sizeof(buf), stdin);
+    if (strlen(message) == 0) {
+      break;
+    }
+    message[strlen(message) - 1] = 0;
+    fprintf(stderr, "libotr helper got: %s\n", message);
+
+    char *newmessage = NULL;
+    OtrlTLV *tlvs;
+    int ignore_message = otrl_message_receiving(userstate, &uiops, NULL, "account", "proto", "peer", message, &newmessage, &tlvs, NULL, NULL);
+    if (tlvs) {
+            otrl_tlv_free(tlvs);
+    }
+
+    if (newmessage != NULL) {
+      fprintf(stderr, "libotr got: %s\n", newmessage);
+      otrl_message_free(newmessage);
+
+      gcry_error_t err;
+      char *newmessage = NULL;
+
+      err = otrl_message_sending(userstate, &uiops, NULL, "account", "proto", "peer", "test message", NULL, &newmessage, NULL, NULL);
+      if (newmessage == NULL) {
+        fprintf(stderr, "libotr didn't encrypt message\n");
+        return 1;
+      }
+      write(1, newmessage, strlen(newmessage));
+      write(1, "\n", 1);
+      g_session_established = 0;
+      otrl_message_free(newmessage);
+      write(1, "?OTRv2?\n", 8);
+    }
+  }
+
+  return 0;
+}