net.h

   1 /*
   2  * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file net.h exported symbols from net.c */
   8
   9 /**
  10  * the buffer size of the sun_path component of struct sockaddr_un
  11  *
  12  * While glibc doesn't define \p UNIX_PATH_MAX, it
  13  * documents it has being limited to 108 bytes.
  14  */
  15 #ifndef UNIX_PATH_MAX
  16 #define UNIX_PATH_MAX 108
  17 #endif
  18
  19 /** \cond Userland defines for Linux DCCP support. */
  20 #ifndef IPPROTO_DCCP
  21 #define IPPROTO_DCCP    33      /**< IANA assigned value */
  22 #define SOCK_DCCP       6       /**< Linux socket type   */
  23 #define SOL_DCCP        269     /**< Linux socket level  */
  24 #endif
  25 /** \endcond */
  26
  27 /**
  28  * Generic socket creation (passive and active sockets).
  29  */
  30 extern int makesock(unsigned l3type, unsigned l4type, int passive,
  31                     const char *host, unsigned short port_number);
  32
  33 /**
  34  * Functions to support listening sockets.
  35  */
  36 /** How many pending connections queue of a listening server will hold. */
  37 #define BACKLOG 10
  38 extern int para_listen(unsigned l3type, unsigned l4type, unsigned short port);
  39
  40 /** Pretty-printing of IPv4/6 socket addresses */
  41 extern char *host_and_port(struct sockaddr *sa, socklen_t len);
  42 extern char *local_name(int sockfd);
  43 extern char *remote_name(int sockfd);
  44
  45 /** used to crypt the communication between para_server and para_client */
  46 typedef void crypt_function(unsigned long len,
  47         const unsigned char *indata, unsigned char *outdata, void *private_data);
  48
  49 int tcp_connect(char *host, int port);
  50 int get_stream_socket(int domain);
  51 int send_buffer(int, const char *);
  52 int send_bin_buffer(int, const char *, size_t);
  53 __printf_2_3 int send_va_buffer(int fd, const char *fmt, ...);
  54 int recv_buffer(int fd, char *buf, size_t size);
  55 int recv_bin_buffer(int fd, char *buf, size_t size);
  56 int para_accept(int, void *addr, socklen_t size);
  57 int create_local_socket(const char *name, struct sockaddr_un *unix_addr,
  58         mode_t mode);
  59 int init_unix_addr(struct sockaddr_un *, const char *);
  60 int recv_cred_buffer(int, char *, size_t);
  61 ssize_t send_cred_buffer(int, char*);
  62 int recv_pattern(int fd, const char *pattern, size_t bufsize);
  63 int tcp_listen(int port);
  64 void enable_crypt(int fd, crypt_function *recv_f, crypt_function *send_f,
  65         void *private_data);
  66 void disable_crypt(int fd);
  67
  68 /**
  69  * A wrapper around connect(2).
  70  *
  71  * \param fd The file descriptor.
  72  * \param addr The address to connect.
  73  * \param len The size of \a addr.
  74  *
  75  * This should not be called directly. Always use the PARA_CONNECT macro.
  76  *
  77  * \return \p -E_CONNECT on errors, 1 on success.
  78  *
  79  * \sa connect(2), PARA_CONNECT.
  80  */
  81 static inline int _para_connect(int fd, void *addr, socklen_t len)
  82 {
  83         if (connect(fd, (struct sockaddr *)addr, len) == -1)
  84                 return -E_CONNECT;
  85         return 1;
  86 }
  87
  88 /** A macro for connect() which does not need a \a len parameter. */
  89 #define PARA_CONNECT(fd, addr) _para_connect(fd, addr, sizeof(*(addr)))