net.h

   1 /*
   2  * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6 #include <stdbool.h>
   7
   8 /** \file net.h exported symbols from net.c */
   9
  10 /**
  11  * the buffer size of the sun_path component of struct sockaddr_un
  12  *
  13  * While glibc doesn't define \p UNIX_PATH_MAX, it
  14  * documents it has being limited to 108 bytes.
  15  */
  16 #ifndef UNIX_PATH_MAX
  17 #define UNIX_PATH_MAX 108
  18 #endif
  19
  20 /** \cond Userland defines for Linux DCCP support. */
  21 #ifndef IPPROTO_DCCP
  22 #define IPPROTO_DCCP    33      /**< IANA assigned value */
  23 #define SOCK_DCCP       6       /**< Linux socket type   */
  24 #define SOL_DCCP        269     /**< Linux socket level  */
  25 #endif
  26 /** \endcond */
  27
  28
  29 /**
  30  * Functions to parse and validate (parts of) URLs.
  31  */
  32 extern char *parse_url(const char *url,
  33                        char *host, ssize_t hostlen, int32_t *port);
  34 /**
  35  * Ensure that string conforms to the IPv4 address format.
  36  *
  37  * \param address The address string to check.
  38  *
  39  * \return 1 if \a address conforms to the IPv4 address format, else 0.
  40  */
  41 _static_inline_ bool is_valid_ipv4_address(const char *address)
  42 {
  43         struct in_addr test_it;
  44
  45         return inet_pton(AF_INET, address, &test_it) != 0;
  46 }
  47
  48 /**
  49  * Ensure that string conforms to IPv6 address format.
  50  *
  51  * \param address The address string to check.
  52  *
  53  * \return 1 if string has a valid IPv6 address syntax, 0 if not.
  54  * \sa RFC 4291
  55  */
  56 _static_inline_ bool is_valid_ipv6_address(const char *address)
  57 {
  58         struct in6_addr test_it;
  59
  60         return inet_pton(AF_INET6, address, &test_it) != 0;
  61 }
  62
  63 /**
  64  * Generic socket creation (passive and active sockets).
  65  */
  66 extern int makesock(unsigned l3type, unsigned l4type, int passive,
  67                     const char *host, unsigned short port_number);
  68 extern struct in_addr extract_v4_addr(const struct sockaddr_storage *ss);
  69
  70 /**
  71  * Functions to support listening sockets.
  72  */
  73 /** How many pending connections queue of a listening server will hold. */
  74 #define BACKLOG 10
  75 extern int para_listen(unsigned l3type, unsigned l4type, unsigned short port);
  76
  77 /** Pretty-printing of IPv4/6 socket addresses */
  78 extern char *local_name(int sockfd);
  79 extern char *remote_name(int sockfd);
  80
  81 /** used to crypt the communication between para_server and para_client */
  82 typedef void crypt_function(unsigned long len,
  83         const unsigned char *indata, unsigned char *outdata, void *private_data);
  84
  85 int send_buffer(int, const char *);
  86 int send_bin_buffer(int, const char *, size_t);
  87 __printf_2_3 int send_va_buffer(int fd, const char *fmt, ...);
  88 int recv_buffer(int fd, char *buf, size_t size);
  89 int recv_bin_buffer(int fd, char *buf, size_t size);
  90 int para_accept(int, void *addr, socklen_t size);
  91 int create_local_socket(const char *name, struct sockaddr_un *unix_addr,
  92         mode_t mode);
  93 int create_remote_socket(const char *name);
  94 int recv_cred_buffer(int, char *, size_t);
  95 ssize_t send_cred_buffer(int, char*);
  96 int recv_pattern(int fd, const char *pattern, size_t bufsize);
  97 void enable_crypt(int fd, crypt_function *recv_f, crypt_function *send_f,
  98         void *private_data);
  99 void disable_crypt(int fd);