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/*
* librd - Rapid Development C library
*
* Copyright (c) 2012, Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RDADDR_H_
#define _RDADDR_H_
#ifndef _WIN32
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#else
#define WIN32_MEAN_AND_LEAN
#include <winsock2.h>
#include <ws2ipdef.h>
#endif
#if defined(__FreeBSD__) || defined(_AIX) || defined(__OpenBSD__)
#include <sys/socket.h>
#endif
/**
* rd_sockaddr_inx_t is a union for either ipv4 or ipv6 sockaddrs.
* It provides conveniant abstraction of AF_INET* agnostic operations.
*/
typedef union {
struct sockaddr_in in;
struct sockaddr_in6 in6;
} rd_sockaddr_inx_t;
#define sinx_family in.sin_family
#define sinx_addr in.sin_addr
#define RD_SOCKADDR_INX_LEN(sinx) \
((sinx)->sinx_family == AF_INET \
? sizeof(struct sockaddr_in) \
: (sinx)->sinx_family == AF_INET6 ? sizeof(struct sockaddr_in6) \
: sizeof(rd_sockaddr_inx_t))
#define RD_SOCKADDR_INX_PORT(sinx) \
((sinx)->sinx_family == AF_INET \
? (sinx)->in.sin_port \
: (sinx)->sinx_family == AF_INET6 ? (sinx)->in6.sin6_port : 0)
#define RD_SOCKADDR_INX_PORT_SET(sinx, port) \
do { \
if ((sinx)->sinx_family == AF_INET) \
(sinx)->in.sin_port = port; \
else if ((sinx)->sinx_family == AF_INET6) \
(sinx)->in6.sin6_port = port; \
} while (0)
/**
* Returns a thread-local temporary string (may be called up to 32 times
* without buffer wrapping) containing the human string representation
* of the sockaddr (which should be AF_INET or AF_INET6 at this point).
* If the RD_SOCKADDR2STR_F_PORT is provided the port number will be
* appended to the string.
* IPv6 address enveloping ("[addr]:port") will also be performed
* if .._F_PORT is set.
*/
#define RD_SOCKADDR2STR_F_PORT 0x1 /* Append the port. */
#define RD_SOCKADDR2STR_F_RESOLVE \
0x2 /* Try to resolve address to hostname. \
*/
#define RD_SOCKADDR2STR_F_FAMILY 0x4 /* Prepend address family. */
#define RD_SOCKADDR2STR_F_NICE /* Nice and friendly output */ \
(RD_SOCKADDR2STR_F_PORT | RD_SOCKADDR2STR_F_RESOLVE)
const char *rd_sockaddr2str(const void *addr, int flags);
/**
* Splits a node:service definition up into their node and svc counterparts
* suitable for passing to getaddrinfo().
* Returns NULL on success (and temporarily available pointers in '*node'
* and '*svc') or error string on failure.
*
* Thread-safe but returned buffers in '*node' and '*svc' are only
* usable until the next call to rd_addrinfo_prepare() in the same thread.
*/
const char *rd_addrinfo_prepare(const char *nodesvc, char **node, char **svc);
typedef struct rd_sockaddr_list_s {
int rsal_cnt;
int rsal_curr;
rd_sockaddr_inx_t rsal_addr[];
} rd_sockaddr_list_t;
/**
* Returns the next address from a sockaddr list and updates
* the current-index to point to it.
*
* Typical usage is for round-robin connection attempts or similar:
* while (1) {
* rd_sockaddr_inx_t *sinx = rd_sockaddr_list_next(my_server_list);
* if (do_connect((struct sockaddr *)sinx) == -1) {
* sleep(1);
* continue;
* }
* ...
* }
*
*/
static RD_INLINE rd_sockaddr_inx_t *
rd_sockaddr_list_next(rd_sockaddr_list_t *rsal) RD_UNUSED;
static RD_INLINE rd_sockaddr_inx_t *
rd_sockaddr_list_next(rd_sockaddr_list_t *rsal) {
rsal->rsal_curr = (rsal->rsal_curr + 1) % rsal->rsal_cnt;
return &rsal->rsal_addr[rsal->rsal_curr];
}
#define RD_SOCKADDR_LIST_FOREACH(sinx, rsal) \
for ((sinx) = &(rsal)->rsal_addr[0]; \
(sinx) < &(rsal)->rsal_addr[(rsal)->rsal_len]; (sinx)++)
/**
* Wrapper for getaddrinfo(3) that performs these additional tasks:
* - Input is a combined "<node>[:<svc>]" string, with support for
* IPv6 enveloping ("[addr]:port").
* - Returns a rd_sockaddr_list_t which must be freed with
* rd_sockaddr_list_destroy() when done with it.
* - Automatically shuffles the returned address list to provide
* round-robin (unless RD_AI_NOSHUFFLE is provided in 'flags').
*
* Thread-safe.
*/
#define RD_AI_NOSHUFFLE \
0x10000000 /* Dont shuffle returned address list. \
* FIXME: Guessing non-used bits like this \
* is a bad idea. */
struct addrinfo;
rd_sockaddr_list_t *
rd_getaddrinfo(const char *nodesvc,
const char *defsvc,
int flags,
int family,
int socktype,
int protocol,
int (*resolve_cb)(const char *node,
const char *service,
const struct addrinfo *hints,
struct addrinfo **res,
void *opaque),
void *opaque,
const char **errstr);
/**
* Frees a sockaddr list.
*
* Thread-safe.
*/
void rd_sockaddr_list_destroy(rd_sockaddr_list_t *rsal);
/**
* Returns the human readable name of a socket family.
*/
static const char *rd_family2str(int af) RD_UNUSED;
static const char *rd_family2str(int af) {
switch (af) {
case AF_INET:
return "inet";
case AF_INET6:
return "inet6";
default:
return "af?";
};
}
#endif /* _RDADDR_H_ */
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