added inital version (working main lopp with signal handler)

git-svn-id: https://svn.spreadspace.org/tcpproxy/trunk@2 e61f0598-a718-4e21-a8f0-0aadfa62ad6b

1 files changed, 179 insertions, 0 deletions

diff --git a/src/tcpproxy.c b/src/tcpproxy.c
new file mode 100644
index 0000000..68add0f
--- /dev/null
+++ b/src/tcpproxy.c
@@ -0,0 +1,179 @@
+/*
+ *  tcpproxy
+ *
+ *  tcpproxy is a simple tcp connection proxy which combines the 
+ *  features of rinetd and 6tunnel. tcpproxy supports IPv4 and 
+ *  IPv6 and also supports connections from IPv6 to IPv4 
+ *  endpoints and vice versa.
+ *  
+ *
+ *  Copyright (C) 2010-2011 Christian Pointner <equinox@spreadspace.org>
+ *                         
+ *  This file is part of tcpproxy.
+ *
+ *  tcpproxy is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  tcpproxy is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with tcpproxy. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include "datatypes.h"
+#include "options.h"
+#include "string_list.h"
+#include "log.h"
+#include "daemon.h"
+
+int main_loop(options_t* opt)
+{
+  log_printf(INFO, "entering main loop");
+
+  int return_value = 0;
+  int sig_fd = signal_init();
+  if(sig_fd < 0)
+    return_value -1;
+
+  fd_set readfds, readyfds;
+  FD_ZERO(&readfds);
+  FD_SET(sig_fd, &readfds);
+  int nfds = (nfds < sig_fd) ? sig_fd : nfds;
+
+  while(!return_value) {
+    memcpy(&readyfds, &readfds, sizeof(readyfds));
+    int ret = select(nfds + 1, &readyfds, NULL, NULL, NULL);
+    if(ret == -1 && errno != EINTR) {
+      log_printf(ERROR, "select returned with error: %s", strerror(errno));
+      return_value = -1;
+      break;
+    }
+    if(!ret || ret == -1)
+      continue;
+
+    if(FD_ISSET(sig_fd, &readyfds)) {
+      if(signal_handle()) {
+        return_value = 1;
+        break;
+      }
+    }
+  }
+
+  signal_stop();
+  return return_value;
+}
+
+int main(int argc, char* argv[])
+{
+  log_init();
+
+  options_t opt;
+  int ret = options_parse(&opt, argc, argv);
+  if(ret) {
+    if(ret > 0) {
+      fprintf(stderr, "syntax error near: %s\n\n", argv[ret]);
+    }
+    if(ret == -2) {
+      fprintf(stderr, "memory error on options_parse, exitting\n");
+    }
+    if(ret == -3) {
+      options_print_version();
+    }
+
+    if(ret != -2 && ret != -3) 
+      options_print_usage();
+
+    if(ret == -1 || ret == -3)
+      ret = 0;
+
+    options_clear(&opt);
+    log_close();
+    exit(ret);
+  }
+  string_list_element_t* tmp = opt.log_targets_.first_;
+  while(tmp) {
+    ret = log_add_target(tmp->string_);
+    if(ret) {
+      switch(ret) {
+      case -2: fprintf(stderr, "memory error on log_add_target, exitting\n"); break;
+      case -3: fprintf(stderr, "unknown log target: '%s', exitting\n", tmp->string_); break;
+      case -4: fprintf(stderr, "this log target is only allowed once: '%s', exitting\n", tmp->string_); break;
+      default: fprintf(stderr, "syntax error near: '%s', exitting\n", tmp->string_); break;
+      }
+      
+      options_clear(&opt);
+      log_close();
+      exit(ret);
+    }
+    tmp = tmp->next_;
+  }
+
+  log_printf(NOTICE, "just started...");
+  options_parse_post(&opt);
+
+  priv_info_t priv;
+  if(opt.username_)
+    if(priv_init(&priv, opt.username_, opt.groupname_)) {
+      options_clear(&opt);
+      log_close();
+      exit(-1);
+    }
+
+  FILE* pid_file = NULL;
+  if(opt.pid_file_) {
+    pid_file = fopen(opt.pid_file_, "w");
+    if(!pid_file) {
+      log_printf(WARNING, "unable to open pid file: %s", strerror(errno));
+    }
+  }
+
+  if(opt.chroot_dir_)
+    if(do_chroot(opt.chroot_dir_)) {
+      options_clear(&opt);
+      log_close();
+      exit(-1);
+    }
+  if(opt.username_)
+    if(priv_drop(&priv)) {
+      options_clear(&opt);
+      log_close();
+      exit(-1);
+    }  
+
+  if(opt.daemonize_) {
+    pid_t oldpid = getpid();
+    daemonize();
+    log_printf(INFO, "running in background now (old pid: %d)", oldpid);
+  }
+
+  if(pid_file) {
+    pid_t pid = getpid();
+    fprintf(pid_file, "%d", pid);
+    fclose(pid_file);
+  }
+
+  ret = main_loop(&opt);
+
+  options_clear(&opt);
+
+  if(!ret)
+    log_printf(NOTICE, "normal shutdown");
+  else if(ret < 0)
+    log_printf(NOTICE, "shutdown after error");
+  else
+    log_printf(NOTICE, "shutdown after signal");
+
+  log_close();
+
+	return ret;
+}