added inital serialclient code

1 files changed, 255 insertions, 0 deletions

diff --git a/serialclient.c b/serialclient.c
new file mode 100644
index 0000000..1e5adb8
--- /dev/null
+++ b/serialclient.c
@@ -0,0 +1,255 @@
+/*
+ *  rhctl
+ *
+ *  Copyright (C) 2009 Christian Pointner <equinox@spreadspace.org>
+ *
+ *  This file is part of rhctl.
+ *
+ *  rhctl 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.
+ *
+ *  rhctl 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 rhctl. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "datatypes.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include "log.h"
+#include "sig_handler.h"
+#include "options.h"
+
+#include "daemon.h"
+#include "utils.h"
+
+int process_data(int src_fd, int dest_fd)
+{
+  char* buffer[100];
+  int ret = read(src_fd, buffer, 100);
+  if(!ret)
+    return 2;
+  if(ret == -1 && errno == EAGAIN)
+    return 0;
+  if(ret < 0)
+    return ret;
+  
+  int len = ret;
+  int offset = 0;
+  for(;;) {
+    ret = write(dest_fd, &buffer[offset], len - offset);
+    if(ret < 0) {
+      if(errno != EINTR)
+        return ret;
+
+      ret = 0;
+    }
+
+    offset += ret;
+    if(offset+1 >= len)
+      break;
+  }
+  return ret;
+}
+
+int main_loop(int serial_fd, int cmd_fd, options_t* opt)
+{
+  log_printf(NOTICE, "entering main loop");
+
+  fd_set readfds, tmpfds;
+  FD_ZERO(&readfds);
+  FD_SET(serial_fd, &readfds);
+  FD_SET(cmd_fd, &readfds);
+  int max_fd = serial_fd > cmd_fd ? serial_fd : cmd_fd;
+
+  int sig_fd = signal_init();
+  if(sig_fd < 0)
+    return -1;
+  FD_SET(sig_fd, &readfds);
+  max_fd = (max_fd < sig_fd) ? sig_fd : max_fd;
+
+  int return_value = 0;
+
+  return_value = send_string(cmd_fd, opt->type);
+
+  while(!return_value) {
+    memcpy(&tmpfds, &readfds, sizeof(tmpfds));
+
+    int ret = select(max_fd+1, &tmpfds, NULL, NULL, NULL);
+    if(ret == -1 && errno != EINTR) {
+      log_printf(ERROR, "select returned with error: %s", strerror(errno));
+      return_value = -1;
+      break;
+    }
+    if(ret == -1 || !ret)
+      continue;
+
+    if(FD_ISSET(sig_fd, &tmpfds)) {
+      if(signal_handle()) {
+        return_value = 1;
+        break;
+      }
+    }
+   
+    if(FD_ISSET(serial_fd, &tmpfds)) {
+      return_value = process_data(serial_fd, cmd_fd);
+      if(return_value)
+        break;
+    }
+
+    if(FD_ISSET(cmd_fd, &tmpfds)) {
+      return_value = process_data(cmd_fd, serial_fd);
+    }
+  }
+
+  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, exiting\n");
+    }
+
+    if(ret != -2)
+      options_print_usage();
+
+    options_clear(&opt);
+    log_close();
+    exit(ret);
+  }
+  string_list_element_t* tmp = opt.log_targets_.first_;
+  if(!tmp) {
+    log_add_target("syslog:3,serialclient,daemon");
+  }
+  else {
+    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...");
+  if(options_parse_post(&opt)) {
+    options_clear(&opt);
+    log_close();
+    exit(-1);
+  }
+
+  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);
+  }
+
+  int cmd_fd = init_command_socket(opt.command_sock_);
+  if(cmd_fd < 0) {
+    options_clear(&opt);
+    log_close();
+    exit(-1);
+  }
+  
+  int serial_fd = 0;
+  for(;;) {
+    serial_fd = open(opt.serial_dev_, O_RDWR | O_NOCTTY);
+    if(serial_fd < 0)
+      ret = 2;
+    else {
+      ret = setup_tty(serial_fd, B38400);
+      if(ret)
+        ret = 2;
+      else
+        ret = main_loop(serial_fd, cmd_listen_fd, &opt);
+    }
+
+    if(ret == 2) {
+      log_printf(ERROR, "%s error, trying to reopen in 5 seconds..", opt.serial_dev_);
+      if(serial_fd > 0)
+        close(serial_fd);
+      sleep(5);
+    }
+    else
+      break;
+  }
+
+  close(cmd_listen_fd);
+  if(serial_fd > 0)
+    close(serial_fd);
+
+  if(!ret)
+    log_printf(NOTICE, "normal shutdown");
+  else if(ret < 0)
+    log_printf(NOTICE, "shutdown after error");
+  else
+    log_printf(NOTICE, "shutdown after signal");
+
+  options_clear(&opt);
+  log_close();
+
+  return ret;
+}