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FFmpeg/libavformat/network.h
Martin Storsjö 9b4c3f5aad network: Add RFC 8305 style "Happy Eyeballs"/"Fast Fallback" helper function 
For cases with dual stack (IPv4 + IPv6) connectivity, but where one
stack potentially is less reliable, strive to trying to connect over
both protocols in parallel, using whichever address connected first.

In cases with a hostname resolving to multiple IPv4 and IPv6
addresses, the current connection mechanism would try all addresses
in the order returned by getaddrinfo (with all IPv6 addresses ordered
before the IPv4 addresses normally). If connection attempts to the
IPv6 addresses return quickly with an error, this was no problem, but
if they were unsuccessful leading up to timeouts, the connection process
would have to wait for timeouts on all IPv6 target addresses before
attempting any IPv4 address.

Similar to what RFC 8305 suggests, reorder the list of addresses to
try connecting to, interleaving address families. After starting one
connection attempt, start another one in parallel after a small delay
(200 ms as suggested by the RFC).

For cases with unreliable IPv6 but reliable IPv4, this should make
connection attempts work as reliably as with plain IPv4, with only an
extra 200 ms of connection delay.

Signed-off-by: Martin Storsjö <martin@martin.st>
2018-08-31 12:26:51 +03:00

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/*
* Copyright (c) 2007 The Libav Project
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFORMAT_NETWORK_H
#define AVFORMAT_NETWORK_H
#include <errno.h>
#include <stdint.h>
#include "config.h"
#include "libavutil/error.h"
#include "os_support.h"
#include "url.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#include <ws2tcpip.h>
#ifndef EPROTONOSUPPORT
#define EPROTONOSUPPORT WSAEPROTONOSUPPORT
#endif
#ifndef ETIMEDOUT
#define ETIMEDOUT WSAETIMEDOUT
#endif
#ifndef ECONNREFUSED
#define ECONNREFUSED WSAECONNREFUSED
#endif
#ifndef EINPROGRESS
#define EINPROGRESS WSAEINPROGRESS
#endif
#define getsockopt(a, b, c, d, e) getsockopt(a, b, c, (char*) d, e)
#define setsockopt(a, b, c, d, e) setsockopt(a, b, c, (const char*) d, e)
int ff_neterrno(void);
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define ff_neterrno() AVERROR(errno)
#endif /* HAVE_WINSOCK2_H */
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_POLL_H
#include <poll.h>
#endif
int ff_socket_nonblock(int socket, int enable);
extern int ff_network_inited_globally;
int ff_network_init(void);
void ff_network_close(void);
void ff_tls_init(void);
void ff_tls_deinit(void);
int ff_network_wait_fd(int fd, int write);
int ff_inet_aton (const char * str, struct in_addr * add);
#if !HAVE_STRUCT_SOCKADDR_STORAGE
struct sockaddr_storage {
#if HAVE_STRUCT_SOCKADDR_SA_LEN
uint8_t ss_len;
uint8_t ss_family;
#else
uint16_t ss_family;
#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
char ss_pad1[6];
int64_t ss_align;
char ss_pad2[112];
};
#endif /* !HAVE_STRUCT_SOCKADDR_STORAGE */
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
#if !HAVE_STRUCT_ADDRINFO
struct addrinfo {
int ai_flags;
int ai_family;
int ai_socktype;
int ai_protocol;
int ai_addrlen;
struct sockaddr *ai_addr;
char *ai_canonname;
struct addrinfo *ai_next;
};
#endif /* !HAVE_STRUCT_ADDRINFO */
/* getaddrinfo constants */
#ifndef EAI_AGAIN
#define EAI_AGAIN 2
#endif
#ifndef EAI_BADFLAGS
#define EAI_BADFLAGS 3
#endif
#ifndef EAI_FAIL
#define EAI_FAIL 4
#endif
#ifndef EAI_FAMILY
#define EAI_FAMILY 5
#endif
#ifndef EAI_MEMORY
#define EAI_MEMORY 6
#endif
#ifndef EAI_NODATA
#define EAI_NODATA 7
#endif
#ifndef EAI_NONAME
#define EAI_NONAME 8
#endif
#ifndef EAI_SERVICE
#define EAI_SERVICE 9
#endif
#ifndef EAI_SOCKTYPE
#define EAI_SOCKTYPE 10
#endif
#ifndef AI_PASSIVE
#define AI_PASSIVE 1
#endif
#ifndef AI_CANONNAME
#define AI_CANONNAME 2
#endif
#ifndef AI_NUMERICHOST
#define AI_NUMERICHOST 4
#endif
#ifndef NI_NOFQDN
#define NI_NOFQDN 1
#endif
#ifndef NI_NUMERICHOST
#define NI_NUMERICHOST 2
#endif
#ifndef NI_NAMERQD
#define NI_NAMERQD 4
#endif
#ifndef NI_NUMERICSERV
#define NI_NUMERICSERV 8
#endif
#ifndef NI_DGRAM
#define NI_DGRAM 16
#endif
#if !HAVE_GETADDRINFO
int ff_getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res);
void ff_freeaddrinfo(struct addrinfo *res);
int ff_getnameinfo(const struct sockaddr *sa, int salen,
char *host, int hostlen,
char *serv, int servlen, int flags);
#define getaddrinfo ff_getaddrinfo
#define freeaddrinfo ff_freeaddrinfo
#define getnameinfo ff_getnameinfo
#endif /* !HAVE_GETADDRINFO */
#if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H
const char *ff_gai_strerror(int ecode);
#undef gai_strerror
#define gai_strerror ff_gai_strerror
#endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */
#ifndef INADDR_LOOPBACK
#define INADDR_LOOPBACK 0x7f000001
#endif
#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif
#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN INET_ADDRSTRLEN
#endif
#ifndef IN_MULTICAST
#define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
#endif
#ifndef IN6_IS_ADDR_MULTICAST
#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
#endif
int ff_is_multicast_address(struct sockaddr *addr);
#define POLLING_TIME 100 /// Time in milliseconds between interrupt check
/**
* Bind to a file descriptor and poll for a connection.
*
* @param fd First argument of bind().
* @param addr Second argument of bind().
* @param addrlen Third argument of bind().
* @param timeout Polling timeout in milliseconds.
* @param h URLContext providing interrupt check
* callback and logging context.
* @return A non-blocking file descriptor on success
* or an AVERROR on failure.
*/
int ff_listen_bind(int fd, const struct sockaddr *addr,
socklen_t addrlen, int timeout,
URLContext *h);
/**
* Connect to a file descriptor and poll for result.
*
* @param fd First argument of connect(),
* will be set as non-blocking.
* @param addr Second argument of connect().
* @param addrlen Third argument of connect().
* @param timeout Polling timeout in milliseconds.
* @param h URLContext providing interrupt check
* callback and logging context.
* @param will_try_next Whether the caller will try to connect to another
* address for the same host name, affecting the form of
* logged errors.
* @return 0 on success, AVERROR on failure.
*/
int ff_listen_connect(int fd, const struct sockaddr *addr,
socklen_t addrlen, int timeout,
URLContext *h, int will_try_next);
int ff_http_match_no_proxy(const char *no_proxy, const char *hostname);
int ff_socket(int domain, int type, int protocol);
/**
* Connect to any of the given addrinfo addresses, with multiple attempts
* running in parallel.
*
* @param addrs The list of addresses to try to connect to.
* This list will be mutated internally, but the list head
* will remain as such, so this doesn't affect the caller
* freeing the list afterwards.
* @param timeout_ms_per_address The number of milliseconds to wait for each
* connection attempt. Since multiple addresses are tried,
* some of them in parallel, the total run time will at most
* be timeout_ms_per_address*ceil(nb_addrs/parallel) +
* (parallel - 1) * NEXT_ATTEMPT_DELAY_MS.
* @param parallel The maximum number of connections to attempt in parallel.
* This is limited to an internal maximum capacity.
* @param h URLContext providing interrupt check
* callback and logging context.
* @param fd If successful, the connected socket is returned here.
* @param customize_fd Function that will be called for each socket created,
* to allow the caller to set socket options before calling
* connect() on it, may be NULL.
* @param customize_ctx Context parameter passed to customize_fd.
* @return 0 on success, AVERROR on failure.
*/
int ff_connect_parallel(struct addrinfo *addrs, int timeout_ms_per_address,
int parallel, URLContext *h, int *fd,
void (*customize_fd)(void *, int), void *customize_ctx);
#endif /* AVFORMAT_NETWORK_H */
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