net.h

   1 /* Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2 /** \file net.h exported symbols from net.c */
   3
   4 /**
   5  * The buffer size of the sun_path component of struct sockaddr_un.
   6  *
   7  * While glibc doesn't define \p UNIX_PATH_MAX, it documents it has being
   8  * limited to 108 bytes. On NetBSD it is only 104 bytes though. We trust \p
   9  * UNIX_PATH_MAX if it is defined and use the size of the ->sun_path member
  10  * otherwise. This should be safe everywhere.
  11  */
  12 #ifndef UNIX_PATH_MAX
  13 #define UNIX_PATH_MAX (sizeof(((struct sockaddr_un *)0)->sun_path))
  14 #endif
  15
  16 /* Userland defines for Linux DCCP support. */
  17
  18 #ifndef IPPROTO_DCCP
  19 #define IPPROTO_DCCP 33 /**< IANA assigned value. */
  20 #endif
  21
  22 #ifndef SOCK_DCCP
  23 #define SOCK_DCCP 6 /**< Linux socket type. */
  24 #endif
  25
  26 #ifndef DCCP_SOCKOPT_RX_CCID
  27 /** Per-connection CCID support (set/get the RX CCID, since v2.6.30-rc1). */
  28 #define DCCP_SOCKOPT_RX_CCID 15
  29 #endif
  30
  31 #ifndef SOL_DCCP
  32 #define SOL_DCCP 269 /**< Linux socket level. */
  33 #endif
  34
  35 #ifndef DCCP_SOCKOPT_GET_CUR_MPS
  36 #define DCCP_SOCKOPT_GET_CUR_MPS  5 /**< Max packet size, RFC 4340, 14. */
  37 #endif
  38
  39 #ifndef DCCP_SOCKOPT_AVAILABLE_CCIDS
  40 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12 /**< List of supported CCIDs. */
  41 #endif
  42
  43 #ifndef DCCP_SOCKOPT_CCID
  44 #define DCCP_SOCKOPT_CCID 13 /**< Sets both TX/RX CCID. */
  45 #endif
  46
  47 #ifndef DCCP_SOCKOPT_TX_CCID
  48 #define DCCP_SOCKOPT_TX_CCID 14 /**< Set/get the TX CCID. */
  49 #endif
  50
  51 /** The maximum length of the host component in an URL. */
  52 #define MAX_HOSTLEN 256
  53
  54 /**
  55  * Flowopts: Transport-layer independent encapsulation of socket options
  56  *           that need to be registered prior to setting up a connection.
  57  */
  58 struct flowopts;
  59
  60 extern struct flowopts *flowopt_new(void);
  61 extern void flowopt_add(struct flowopts *fo, int level, int opt,
  62                 const char *name, const void *val, int len);
  63 void flowopt_cleanup(struct flowopts *fo);
  64 /** Flowopt shortcut macros */
  65 #define OPT_ADD(fo, lev, opt, val, len) flowopt_add(fo, lev, opt, #opt, val, len)
  66
  67 /**
  68  * Functions to parse and validate (parts of) URLs.
  69  */
  70 extern char *parse_cidr(const char *cidr,
  71                         char *addr, ssize_t addrlen, int32_t *netmask);
  72 extern char *parse_url(const char *url,
  73                        char *host, ssize_t hostlen, int32_t *port);
  74 char *format_url(const char *url, int default_port);
  75 extern const char *stringify_port(int port, const char *transport);
  76 /**
  77  * Ensure that string conforms to the IPv4 address format.
  78  *
  79  * \param address The address string to check.
  80  *
  81  * \return 1 if \a address conforms to the IPv4 address format, else 0.
  82  */
  83 _static_inline_ bool is_valid_ipv4_address(const char *address)
  84 {
  85         struct in_addr test_it;
  86
  87         return inet_pton(AF_INET, address, &test_it) != 0;
  88 }
  89
  90 /**
  91  * Ensure that string conforms to IPv6 address format.
  92  *
  93  * \param address The address string to check.
  94  *
  95  * \return 1 if string has a valid IPv6 address syntax, 0 if not.
  96  * \sa RFC 4291.
  97  */
  98 _static_inline_ bool is_valid_ipv6_address(const char *address)
  99 {
 100         struct in6_addr test_it;
 101
 102         return inet_pton(AF_INET6, address, &test_it) != 0;
 103 }
 104
 105 int lookup_address(unsigned l4type, bool passive, const char *host,
 106                 int port_number, struct addrinfo **result);
 107
 108 /**
 109  * Generic socket creation (passive and active sockets).
 110  */
 111 int makesock(unsigned l4type, bool passive, const char *host,
 112                 uint16_t port_number, struct flowopts *fo);
 113
 114 int makesock_addrinfo(unsigned l4type, bool passive, struct addrinfo *ai,
 115                 struct flowopts *fo);
 116
 117 static inline int para_connect_simple(unsigned l4type,
 118                                       const char *host, uint16_t port)
 119 {
 120         return makesock(l4type, 0, host, port, NULL);
 121 }
 122
 123 void extract_v4_addr(const struct sockaddr_storage *ss, struct in_addr *ia);
 124 bool sockaddr_equal(const struct sockaddr *sa1, const struct sockaddr *sa2);
 125
 126 /**
 127  * Functions to support listening sockets.
 128  */
 129 /** How many pending connections queue of a listening server will hold. */
 130 #define BACKLOG 10
 131
 132 int para_listen(unsigned l4type, const char *addr, uint16_t port);
 133 int para_listen_simple(unsigned l4type, uint16_t port);
 134
 135 /** Pretty-printing of IPv4/6 socket addresses */
 136 extern char *remote_name(int sockfd);
 137
 138 /**
 139  * Determining maximum payload (packet) size
 140  */
 141 extern int generic_max_transport_msg_size(int sockfd);
 142
 143 int recv_bin_buffer(int fd, char *buf, size_t size);
 144 int recv_buffer(int fd, char *buf, size_t size);
 145
 146 int para_accept(int fd, fd_set *rfds, void *addr, socklen_t size, int *new_fd);
 147 int create_local_socket(const char *name);
 148 int connect_local_socket(const char *name);
 149 int recv_cred_buffer(int, char *, size_t);
 150 ssize_t send_cred_buffer(int, char*);
 151
 152 /**
 153  * Functions and definitions to support \p IPPROTO_DCCP
 154  */
 155 /** Estimated worst-case length of a DCCP header including options. */
 156 #define DCCP_MAX_HEADER         128
 157 /** Hardcoded maximum number of separate CCID modules compiled into a host. */
 158 #define DCCP_MAX_HOST_CCIDS     20
 159 extern int dccp_available_ccids(uint8_t **ccid_array);