/*
   This program 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 2 of the License, or
   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   xrdp: A Remote Desktop Protocol server.
   Copyright (C) Jay Sorg 2004-2006

   generic operating system calls

   put all the os / arch define in here you want

*/

#if defined(_WIN32)
#include <windows.h>
#include <winsock.h>
#else
/* fix for solaris 10 with gcc 3.3.2 problem */
#if defined(sun) || defined(__sun)
#define ctid_t id_t
#endif
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <signal.h>
#include <fcntl.h>
#include <pwd.h>
#include <time.h>
#include <grp.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>

/* for clearenv() */
#if defined(_WIN32)
#else
extern char** environ;
#endif

/* for solaris */
#if !defined(PF_LOCAL)
#define PF_LOCAL AF_UNIX
#endif
#if !defined(INADDR_NONE)
#define INADDR_NONE ((unsigned long)-1)
#endif

/*****************************************************************************/
/* allocate memory, returns a pointer to it, size bytes are allocated,
   if zero is non zero, each byte will be set to zero */
void*
g_malloc(int size, int zero)
{
  char* rv;

  rv = (char*)malloc(size);
  if (zero)
  {
    memset(rv, 0, size);
  }
  return rv;
}

/*****************************************************************************/
/* free the memory pointed to by ptr, ptr can be zero */
void
g_free(void* ptr)
{
  if (ptr != 0)
  {
    free(ptr);
  }
}

/*****************************************************************************/
/* output text to stdout, try to use g_write / g_writeln instead to avoid
   linux / windows EOL problems */
void
g_printf(char* format, ...)
{
  va_list ap;

  va_start(ap, format);
  vfprintf(stdout, format, ap);
  va_end(ap);
}

/*****************************************************************************/
void
g_sprintf(char* dest, char* format, ...)
{
  va_list ap;

  va_start(ap, format);
  vsprintf(dest, format, ap);
  va_end(ap);
}

/*****************************************************************************/
void
g_snprintf(char* dest, int len, char* format, ...)
{
  va_list ap;

  va_start(ap, format);
  vsnprintf(dest, len, format, ap);
  va_end(ap);
}

/*****************************************************************************/
void
g_writeln(char* format, ...)
{
  va_list ap;

  va_start(ap, format);
  vfprintf(stdout, format, ap);
  va_end(ap);
#if defined(_WIN32)
  g_printf("\r\n");
#else
  g_printf("\n");
#endif
}

/*****************************************************************************/
void
g_write(char* format, ...)
{
  va_list ap;

  va_start(ap, format);
  vfprintf(stdout, format, ap);
  va_end(ap);
}

/*****************************************************************************/
/* produce a hex dump */
void
g_hexdump(char* p, int len)
{
  unsigned char* line;
  int i;
  int thisline;
  int offset;

  line = (unsigned char*)p;
  offset = 0;
  while (offset < len)
  {
    g_printf("%04x ", offset);
    thisline = len - offset;
    if (thisline > 16)
    {
      thisline = 16;
    }
    for (i = 0; i < thisline; i++)
    {
      g_printf("%02x ", line[i]);
    }
    for (; i < 16; i++)
    {
      g_printf("   ");
    }
    for (i = 0; i < thisline; i++)
    {
      g_printf("%c", (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.');
    }
    g_printf("\r\n");
    offset += thisline;
    line += thisline;
  }
}

/*****************************************************************************/
void
g_memset(void* ptr, int val, int size)
{
  memset(ptr, val, size);
}

/*****************************************************************************/
void
g_memcpy(void* d_ptr, const void* s_ptr, int size)
{
  memcpy(d_ptr, s_ptr, size);
}

/*****************************************************************************/
int
g_getchar(void)
{
  return getchar();
}

/*****************************************************************************/
int
g_tcp_set_no_delay(int sck)
{
  int i;

  i = 1;
#if defined(_WIN32)
  setsockopt(sck, IPPROTO_TCP, TCP_NODELAY, (char*)&i, sizeof(i));
#else
  setsockopt(sck, IPPROTO_TCP, TCP_NODELAY, (void*)&i, sizeof(i));
#endif
  return 0;
}

/*****************************************************************************/
int
g_tcp_socket(void)
{
  int rv;
  int i;

  i = 1;
  rv = socket(PF_INET, SOCK_STREAM, 0);
#if defined(_WIN32)
  setsockopt(rv, IPPROTO_TCP, TCP_NODELAY, (char*)&i, sizeof(i));
#else
  setsockopt(rv, IPPROTO_TCP, TCP_NODELAY, (void*)&i, sizeof(i));
#endif
  return rv;
}

/*****************************************************************************/
int
g_tcp_local_socket(void)
{
#if defined(_WIN32)
  return 0;
#else
  return socket(PF_LOCAL, SOCK_STREAM, 0);
#endif
}

/*****************************************************************************/
void
g_tcp_close(int sck)
{
  if (sck == 0)
  {
    return;
  }
  shutdown(sck, 2);
#if defined(_WIN32)
  closesocket(sck);
#else
  close(sck);
#endif
}

/*****************************************************************************/
int
g_tcp_connect(int sck, char* address, char* port)
{
  struct sockaddr_in s;
  struct hostent* h;

  g_memset(&s, 0, sizeof(struct sockaddr_in));
  s.sin_family = AF_INET;
  s.sin_port = htons(atoi(port));
  s.sin_addr.s_addr = inet_addr(address);
  if (s.sin_addr.s_addr == INADDR_NONE)
  {
    h = gethostbyname(address);
    if (h != 0)
    {
      if (h->h_name != 0)
      {
        if (h->h_addr_list != 0)
        {
          if ((*(h->h_addr_list)) != 0)
          {
            s.sin_addr.s_addr = *((int*)(*(h->h_addr_list)));
          }
        }
      }
    }
  }
  return connect(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_in));
}

/*****************************************************************************/
int
g_tcp_set_non_blocking(int sck)
{
  unsigned long i;

#if defined(_WIN32)
  i = 1;
  ioctlsocket(sck, FIONBIO, &i);
#else
  i = fcntl(sck, F_GETFL);
  i = i | O_NONBLOCK;
  fcntl(sck, F_SETFL, i);
#endif
  return 0;
}

/*****************************************************************************/
int
g_tcp_bind(int sck, char* port)
{
  struct sockaddr_in s;

  memset(&s, 0, sizeof(struct sockaddr_in));
  s.sin_family = AF_INET;
  s.sin_port = htons(atoi(port));
  s.sin_addr.s_addr = INADDR_ANY;
  return bind(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_in));
}

/*****************************************************************************/
int
g_tcp_local_bind(int sck, char* port)
{
#if defined(_WIN32)
  return -1;
#else
  struct sockaddr_un s;

  memset(&s, 0, sizeof(struct sockaddr_un));
  s.sun_family = AF_UNIX;
  strcpy(s.sun_path, port);
  return bind(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_un));
#endif
}

/*****************************************************************************/
int
g_tcp_listen(int sck)
{
  return listen(sck, 2);
}

/*****************************************************************************/
int
g_tcp_accept(int sck)
{
  struct sockaddr_in s;
#if defined(_WIN32)
  signed int i;
#else
  unsigned int i;
#endif

  i = sizeof(struct sockaddr_in);
  memset(&s, 0, i);
  return accept(sck, (struct sockaddr*)&s, &i);
}

/*****************************************************************************/
void
g_sleep(int msecs)
{
#if defined(_WIN32)
  Sleep(msecs);
#else
  usleep(msecs * 1000);
#endif
}

/*****************************************************************************/
int
g_tcp_last_error_would_block(int sck)
{
#if defined(_WIN32)
  return WSAGetLastError() == WSAEWOULDBLOCK;
#else
  return errno == EWOULDBLOCK;
#endif
}

/*****************************************************************************/
int
g_tcp_recv(int sck, void* ptr, int len, int flags)
{
#if defined(_WIN32)
  return recv(sck, (char*)ptr, len, flags);
#else
  return recv(sck, ptr, len, flags);
#endif
}

/*****************************************************************************/
int
g_tcp_send(int sck, void* ptr, int len, int flags)
{
#if defined(_WIN32)
  return send(sck, (char*)ptr, len, flags);
#else
  return send(sck, ptr, len, flags);
#endif
}

/*****************************************************************************/
int
g_tcp_select(int sck1, int sck2)
{
  fd_set rfds;
  struct timeval time;
  int max;
  int rv;

  time.tv_sec = 0;
  time.tv_usec = 0;
  FD_ZERO(&rfds);
  if (sck1 > 0)
  {
    FD_SET(((unsigned int)sck1), &rfds);
  }
  if (sck2 > 0)
  {
    FD_SET(((unsigned int)sck2), &rfds);
  }
  max = sck1;
  if (sck2 > max)
  {
    max = sck2;
  }
  rv = select(max + 1, &rfds, 0, 0, &time);
  if (rv > 0)
  {
    rv = 0;
    if (FD_ISSET(((unsigned int)sck1), &rfds))
    {
      rv = rv | 1;
    }
    if (FD_ISSET(((unsigned int)sck2), &rfds))
    {
      rv = rv | 2;
    }
  }
  else
  {
    rv = 0;
  }
  return rv;
}

/*****************************************************************************/
void
g_random(char* data, int len)
{
#if defined(_WIN32)
  memset(data, 0x44, len);
#else
  int fd;

  memset(data, 0x44, len);
  fd = open("/dev/urandom", O_RDONLY);
  if (fd == -1)
  {
    fd = open("/dev/random", O_RDONLY);
  }
  if (fd != -1)
  {
    read(fd, data, len);
    close(fd);
  }
#endif
}

/*****************************************************************************/
int
g_abs(int i)
{
  return abs(i);
}

/*****************************************************************************/
int
g_memcmp(void* s1, void* s2, int len)
{
  return memcmp(s1, s2, len);
}

/*****************************************************************************/
/* returns -1 on error, else return handle or file descriptor */
int
g_file_open(char* file_name)
{
#if defined(_WIN32)
  return (int)CreateFile(file_name, GENERIC_READ | GENERIC_WRITE,
                         FILE_SHARE_READ | FILE_SHARE_WRITE,
                         0, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
#else
  return open(file_name, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
#endif
}

/*****************************************************************************/
/* returns error, always 0 */
int
g_file_close(int fd)
{
#if defined(_WIN32)
  CloseHandle((HANDLE)fd);
#else
  close(fd);
#endif
  return 0;
}

/*****************************************************************************/
/* read from file, returns the number of bytes read or -1 on error */
int
g_file_read(int fd, char* ptr, int len)
{
#if defined(_WIN32)
  if (ReadFile((HANDLE)fd, (LPVOID)ptr, (DWORD)len, (LPDWORD)&len, 0))
  {
    return len;
  }
  else
  {
    return -1;
  }
#else
  return read(fd, ptr, len);
#endif
}

/*****************************************************************************/
/* write to file, returns the number of bytes writen or -1 on error */
int
g_file_write(int fd, char* ptr, int len)
{
#if defined(_WIN32)
  if (WriteFile((HANDLE)fd, (LPVOID)ptr, (DWORD)len, (LPDWORD)&len, 0))
  {
    return len;
  }
  else
  {
    return -1;
  }
#else
  return write(fd, ptr, len);
#endif
}

/*****************************************************************************/
/* move file pointer, returns offset on success, -1 on failure */
int
g_file_seek(int fd, int offset)
{
#if defined(_WIN32)
  int rv;

  rv = (int)SetFilePointer((HANDLE)fd, offset, 0, FILE_BEGIN);
  if (rv == (int)INVALID_SET_FILE_POINTER)
  {
    return -1;
  }
  else
  {
    return rv;
  }
#else
  return (int)lseek(fd, offset, SEEK_SET);
#endif
}

/*****************************************************************************/
/* do a write lock on a file */
/* return boolean */
int
g_file_lock(int fd, int start, int len)
{
#if defined(_WIN32)
  return LockFile((HANDLE)fd, start, 0, len, 0);
#else
  struct flock lock;

  lock.l_type = F_WRLCK;
  lock.l_whence = SEEK_SET;
  lock.l_start = start;
  lock.l_len = len;
  if (fcntl(fd, F_SETLK, &lock) == -1)
  {
    return 0;
  }
  return 1;
#endif
}

/*****************************************************************************/
/* returns error, always zero */
int
g_set_file_rights(char* filename, int read, int write)
{
#if defined(_WIN32)
  return 0;
#else
  int flags;

  flags = read ? S_IRUSR : 0;
  flags |= write ? S_IWUSR : 0;
  chmod(filename, flags);
  return 0;
#endif
}

/*****************************************************************************/
/* returns error, always zero */
int
g_mkdir(char* dirname)
{
#if defined(_WIN32)
  return 0;
#else
  mkdir(dirname, S_IRWXU);
  return 0;
#endif
}

/*****************************************************************************/
/* gets the current working directory and puts up to maxlen chars in
   dirname 
   always returns 0 */
char*
g_get_current_dir(char* dirname, int maxlen)
{
#if defined(_WIN32)
  GetCurrentDirectory(maxlen, dirname);
  return 0;
#else
  getcwd(dirname, maxlen);
  return 0;
#endif
}

/*****************************************************************************/
/* returns error, zero on success and -1 on failure */
int
g_set_current_dir(char* dirname)
{
#if defined(_WIN32)
  if (SetCurrentDirectory(dirname))
  {
    return 0;
  }
  else
  {
    return -1;
  }
#else
  return chdir(dirname);
#endif
}

/*****************************************************************************/
/* returns boolean, non zero if the file exists */
int
g_file_exist(char* filename)
{
#if defined(_WIN32)
  return 0; // use FindFirstFile();
#else
  return access(filename, F_OK) == 0;
#endif
}

/*****************************************************************************/
/* returns non zero if the file was deleted */
int
g_file_delete(char* filename)
{
#if defined(_WIN32)
  return DeleteFile(filename);
#else
  return unlink(filename) != -1;
#endif
}

/*****************************************************************************/
/* returns length of text */
int
g_strlen(char* text)
{
  if (text == 0)
  {
    return 0;
  }
  return strlen(text);
}

/*****************************************************************************/
/* returns dest */
char*
g_strcpy(char* dest, char* src)
{
  if (src == 0 && dest != 0)
  {
    dest[0] = 0;
    return dest;
  }
  if (dest == 0 || src == 0)
  {
    return 0;
  }
  return strcpy(dest, src);
}

/*****************************************************************************/
/* returns dest */
char*
g_strncpy(char* dest, char* src, int len)
{
  char* rv;

  if (src == 0 && dest != 0)
  {
    dest[0] = 0;
    return dest;
  }
  if (dest == 0 || src == 0)
  {
    return 0;
  }
  rv = strncpy(dest, src, len);
  dest[len] = 0;
  return rv;
}

/*****************************************************************************/
/* returns dest */
char*
g_strcat(char* dest, char* src)
{
  if (dest == 0 || src == 0)
  {
    return dest;
  }
  return strcat(dest, src);
}

/*****************************************************************************/
/* if in = 0, return 0 else return newly alloced copy of in */
char*
g_strdup(char* in)
{
  int len;
  char* p;

  if (in == 0)
  {
    return 0;
  }
  len = g_strlen(in);
  p = (char*)g_malloc(len + 1, 0);
  g_strcpy(p, in);
  return p;
}

/*****************************************************************************/
int
g_strcmp(char* c1, char* c2)
{
  return strcmp(c1, c2);
}

/*****************************************************************************/
int
g_strncmp(char* c1, char* c2, int len)
{
  return strncmp(c1, c2, len);
}

/*****************************************************************************/
int
g_strcasecmp(char* c1, char* c2)
{
#if defined(_WIN32)
  return stricmp(c1, c2);
#else
  return strcasecmp(c1, c2);
#endif
}

/*****************************************************************************/
int
g_strncasecmp(char* c1, char* c2, int len)
{
#if defined(_WIN32)
  return strnicmp(c1, c2, len);
#else
  return strncasecmp(c1, c2, len);
#endif
}

/*****************************************************************************/
int
g_atoi(char* str)
{
  return atoi(str);
}

/*****************************************************************************/
int
g_pos(char* str, char* to_find)
{
  char* pp;

  pp = strstr(str, to_find);
  if (pp == 0)
  {
    return -1;
  }
  return (pp - str);
}

/*****************************************************************************/
long
g_load_library(char* in)
{
#if defined(_WIN32)
  return (long)LoadLibrary(in);
#else
  return (long)dlopen(in, RTLD_LOCAL | RTLD_LAZY);
#endif
}

/*****************************************************************************/
int
g_free_library(long lib)
{
  if (lib == 0)
  {
    return 0;
  }
#if defined(_WIN32)
  return FreeLibrary((HMODULE)lib);
#else
  return dlclose((void*)lib);
#endif
}

/*****************************************************************************/
/* returns NULL if not found */
void*
g_get_proc_address(long lib, char* name)
{
  if (lib == 0)
  {
    return 0;
  }
#if defined(_WIN32)
  return GetProcAddress((HMODULE)lib, name);
#else
  return dlsym((void*)lib, name);
#endif
}

/*****************************************************************************/
int
g_system(char* aexec)
{
#if defined(_WIN32)
  return 0;
#else
  return system(aexec);
#endif
}

/*****************************************************************************/
char*
g_get_strerror(void)
{
#if defined(_WIN32)
  return 0;
#else
  return strerror(errno);
#endif
}

/*****************************************************************************/
void
g_execvp(char* p1, char* args[])
{
#if defined(_WIN32)
#else
  execvp(p1, args);
#endif
}

/*****************************************************************************/
int
g_execlp3(char* a1, char* a2, char* a3)
{
#if defined(_WIN32)
  return 0;
#else
  return execlp(a1, a2, a3, (void*)0);
#endif
}

/*****************************************************************************/
int
g_execlp11(char* a1, char* a2, char* a3, char* a4, char* a5, char* a6,
           char* a7, char* a8, char* a9, char* a10, char* a11)
{
#if defined(_WIN32)
  return 0;
#else
  return execlp(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, (void*)0);
#endif
}

/*****************************************************************************/
int
g_execlp13(char* a1, char* a2, char* a3, char* a4, char* a5, char* a6,
           char* a7, char* a8, char* a9, char* a10, char* a11,
           char* a12, char* a13)
{
#if defined(_WIN32)
  return 0;
#else
  return execlp(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
                a12, a13, (void*)0);
#endif
}

/*****************************************************************************/
void
g_signal(int sig_num, void (*func)(int))
{
#if defined(_WIN32)
#else
  signal(sig_num, func);
#endif
}

/*****************************************************************************/
void
g_signal_child_stop(void (*func)(int))
{
#if defined(_WIN32)
#else
  signal(SIGCHLD, func);
#endif
}

/*****************************************************************************/
void
g_unset_signals(void)
{
#if defined(_WIN32)
#else
  sigset_t mask;

  sigemptyset(&mask);
  sigprocmask(SIG_SETMASK, &mask, NULL);
#endif
}

/*****************************************************************************/
int
g_fork(void)
{
#if defined(_WIN32)
  return 0;
#else
  return fork();
#endif
}

/*****************************************************************************/
int
g_setgid(int pid)
{
#if defined(_WIN32)
  return 0;
#else
  return setgid(pid);
#endif
}

/*****************************************************************************/
/* returns error, zero is success, non zero is error */
int
g_initgroups(const char* user, int gid)
{
#if defined(_WIN32)
  return 0;
#else
  return initgroups(user ,gid);
#endif
}
  
/*****************************************************************************/
int
g_setuid(int pid)
{
#if defined(_WIN32)
  return 0;
#else
  return setuid(pid);
#endif
}

/*****************************************************************************/
int
g_waitchild(void)
{
#if defined(_WIN32)
  return 0;
#else
  int wstat;

  return waitpid(0, &wstat, WNOHANG);
#endif
}

/*****************************************************************************/
int
g_waitpid(int pid)
{
#if defined(_WIN32)
  return 0;
#else
  return waitpid(pid, 0, 0);
#endif
}

/*****************************************************************************/
void
g_clearenv(void)
{
#if defined(_WIN32)
#else
  environ = 0;
#endif
}

/*****************************************************************************/
int
g_setenv(char* name, char* value, int rewrite)
{
#if defined(_WIN32)
  return 0;
#else
  return setenv(name, value, rewrite);
#endif
}

/*****************************************************************************/
char*
g_getenv(char* name)
{
#if defined(_WIN32)
  return 0;
#else
  return getenv(name);
#endif
}

/*****************************************************************************/
int
g_exit(int exit_code)
{
  _exit(exit_code);
  return 0;
}

/*****************************************************************************/
int
g_getpid(void)
{
#if defined(_WIN32)
  return 0;
#else
  return getpid();
#endif
}

/*****************************************************************************/
int
g_sigterm(int pid)
{
#if defined(_WIN32)
  return 0;
#else
  return kill(pid, SIGTERM);
#endif
}

/*****************************************************************************/
/* returns 0 if ok */
int
g_getuser_info(char* username, int* gid, int* uid, char* shell, char* dir,
               char* gecos)
{
#if defined(_WIN32)
  return 1;
#else
  struct passwd* pwd_1;

  pwd_1 = getpwnam(username);
  if (pwd_1 != 0)
  {
    if (gid != 0)
    {
      *gid = pwd_1->pw_gid;
    }
    if (uid != 0)
    {
      *uid = pwd_1->pw_uid;
    }
    if (dir != 0)
    {
      g_strcpy(dir, pwd_1->pw_dir);
    }
    if (shell != 0)
    {
      g_strcpy(shell, pwd_1->pw_shell);
    }
    if (gecos != 0)
    {
      g_strcpy(gecos, pwd_1->pw_gecos);
    }
    return 0;
  }
  return 1;
#endif
}

/*****************************************************************************/
/* returns 0 if ok */
int
g_getgroup_info(char* groupname, int* gid)
{
#if defined(_WIN32)
  return 1;
#else
  struct group* g;

  g = getgrnam(groupname);
  if (g != 0)
  {
    if (gid != 0)
    {
      *gid = g->gr_gid;
    }
    return 0;
  }
  return 1;
#endif
}

/*****************************************************************************/
/* returns error */
/* if zero is returned, then ok is set */
int
g_check_user_in_group(char* username, int gid, int* ok)
{
#if defined(_WIN32)
  return 1;
#else
  struct group* groups;
  int i;

  groups = getgrgid(gid);
  if (groups == 0)
  {
    return 1;
  }
  *ok = 0;
  i = 0;
  while (0 != groups->gr_mem[i])
  {
    if (0 == g_strcmp(groups->gr_mem[i], username))
    {
      *ok = 1;
      break;
    }
    i++;
  }
  return 0;
#endif
}

/*****************************************************************************/
/* returns the time since the Epoch (00:00:00 UTC, January 1, 1970),
   measured in seconds. */
int
g_time1(void)
{
#if defined(_WIN32)
  return 0;
#else
  return time(0);
#endif
}