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ffmpeg / libavformat / os_support.c @ 38c3b6e7

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/*
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 * Various utilities for ffmpeg system
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 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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 * copyright (c) 2002 Francois Revol
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/* needed by inet_aton() */
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#define _SVID_SOURCE
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#define _DARWIN_C_SOURCE
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#include "config.h"
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#include "avformat.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include "os_support.h"
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#if CONFIG_NETWORK
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#if !HAVE_POLL_H
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#if HAVE_WINSOCK2_H
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#include <winsock2.h>
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#elif HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#endif
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#include "network.h"
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#if !HAVE_INET_ATON
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#include <stdlib.h>
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#include <strings.h>
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int ff_inet_aton (const char * str, struct in_addr * add)
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{
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    unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
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    if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
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        return 0;
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    if (!add1 || (add1|add2|add3|add4) > 255) return 0;
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    add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
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    return 1;
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}
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#else
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int ff_inet_aton (const char * str, struct in_addr * add)
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{
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    return inet_aton(str, add);
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}
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#endif /* !HAVE_INET_ATON */
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#if !HAVE_GETADDRINFO
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int ff_getaddrinfo(const char *node, const char *service,
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                const struct addrinfo *hints, struct addrinfo **res)
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{
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    struct hostent *h = NULL;
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    struct addrinfo *ai;
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    struct sockaddr_in *sin;
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#if HAVE_WINSOCK2_H
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    int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
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                                  const struct addrinfo *hints,
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                                  struct addrinfo **res);
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    HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
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    win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
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    if (win_getaddrinfo)
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        return win_getaddrinfo(node, service, hints, res);
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#endif
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    *res = NULL;
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    sin = av_mallocz(sizeof(struct sockaddr_in));
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    if (!sin)
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        return EAI_FAIL;
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    sin->sin_family = AF_INET;
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    if (node) {
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        if (!ff_inet_aton(node, &sin->sin_addr)) {
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            if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
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                av_free(sin);
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                return EAI_FAIL;
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            }
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            h = gethostbyname(node);
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            if (!h) {
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                av_free(sin);
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                return EAI_FAIL;
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            }
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            memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
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        }
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    } else {
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        if (hints && (hints->ai_flags & AI_PASSIVE)) {
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            sin->sin_addr.s_addr = INADDR_ANY;
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        } else
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            sin->sin_addr.s_addr = INADDR_LOOPBACK;
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    }
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    /* Note: getaddrinfo allows service to be a string, which
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     * should be looked up using getservbyname. */
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    if (service)
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        sin->sin_port = htons(atoi(service));
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    ai = av_mallocz(sizeof(struct addrinfo));
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    if (!ai) {
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        av_free(sin);
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        return EAI_FAIL;
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    }
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    *res = ai;
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    ai->ai_family = AF_INET;
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    ai->ai_socktype = hints ? hints->ai_socktype : 0;
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    switch (ai->ai_socktype) {
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    case SOCK_STREAM: ai->ai_protocol = IPPROTO_TCP; break;
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    case SOCK_DGRAM:  ai->ai_protocol = IPPROTO_UDP; break;
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    default:          ai->ai_protocol = 0;           break;
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    }
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    ai->ai_addr = (struct sockaddr *)sin;
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    ai->ai_addrlen = sizeof(struct sockaddr_in);
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    if (hints && (hints->ai_flags & AI_CANONNAME))
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        ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
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    ai->ai_next = NULL;
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    return 0;
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}
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void ff_freeaddrinfo(struct addrinfo *res)
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{
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#if HAVE_WINSOCK2_H
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    void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
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    HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
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    win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
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                       GetProcAddress(ws2mod, "freeaddrinfo");
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    if (win_freeaddrinfo) {
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        win_freeaddrinfo(res);
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        return;
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    }
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#endif
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    av_free(res->ai_canonname);
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    av_free(res->ai_addr);
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    av_free(res);
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}
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int ff_getnameinfo(const struct sockaddr *sa, int salen,
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                   char *host, int hostlen,
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                   char *serv, int servlen, int flags)
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{
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    const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
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#if HAVE_WINSOCK2_H
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    int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
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                                  char *host, DWORD hostlen,
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                                  char *serv, DWORD servlen, int flags);
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    HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
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    win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
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    if (win_getnameinfo)
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        return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
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#endif
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    if (sa->sa_family != AF_INET)
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        return EAI_FAMILY;
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    if (!host && !serv)
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        return EAI_NONAME;
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    if (host && hostlen > 0) {
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        struct hostent *ent = NULL;
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        uint32_t a;
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        if (!(flags & NI_NUMERICHOST))
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            ent = gethostbyaddr((const char *)&sin->sin_addr,
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                                sizeof(sin->sin_addr), AF_INET);
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        if (ent) {
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            snprintf(host, hostlen, "%s", ent->h_name);
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        } else if (flags & NI_NAMERQD) {
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            return EAI_NONAME;
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        } else {
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            a = ntohl(sin->sin_addr.s_addr);
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            snprintf(host, hostlen, "%d.%d.%d.%d",
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                     ((a >> 24) & 0xff), ((a >> 16) & 0xff),
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                     ((a >>  8) & 0xff), ( a        & 0xff));
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        }
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    }
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    if (serv && servlen > 0) {
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        struct servent *ent = NULL;
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        if (!(flags & NI_NUMERICSERV))
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            ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
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        if (ent) {
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            snprintf(serv, servlen, "%s", ent->s_name);
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        } else
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            snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
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    }
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    return 0;
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}
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const char *ff_gai_strerror(int ecode)
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{
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    switch(ecode) {
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    case EAI_FAIL   : return "A non-recoverable error occurred";
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    case EAI_FAMILY : return "The address family was not recognized or the address length was invalid for the specified family";
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    case EAI_NONAME : return "The name does not resolve for the supplied parameters";
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    }
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    return "Unknown error";
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}
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#endif
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/* resolve host with also IP address parsing */
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int resolve_host(struct in_addr *sin_addr, const char *hostname)
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{
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    if (!ff_inet_aton(hostname, sin_addr)) {
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#if HAVE_GETADDRINFO
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        struct addrinfo *ai, *cur;
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        struct addrinfo hints;
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        memset(&hints, 0, sizeof(hints));
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        hints.ai_family = AF_INET;
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        if (getaddrinfo(hostname, NULL, &hints, &ai))
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            return -1;
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        /* getaddrinfo returns a linked list of addrinfo structs.
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         * Even if we set ai_family = AF_INET above, make sure
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         * that the returned one actually is of the correct type. */
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        for (cur = ai; cur; cur = cur->ai_next) {
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            if (cur->ai_family == AF_INET) {
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                *sin_addr = ((struct sockaddr_in *)cur->ai_addr)->sin_addr;
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                freeaddrinfo(ai);
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                return 0;
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            }
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        }
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        freeaddrinfo(ai);
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        return -1;
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#else
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        struct hostent *hp;
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        hp = gethostbyname(hostname);
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        if (!hp)
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            return -1;
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        memcpy(sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
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#endif
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    }
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    return 0;
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}
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int ff_socket_nonblock(int socket, int enable)
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{
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#if HAVE_WINSOCK2_H
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   return ioctlsocket(socket, FIONBIO, &enable);
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#else
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   if (enable)
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      return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
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   else
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      return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
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#endif
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}
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#endif /* CONFIG_NETWORK */
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#if CONFIG_FFSERVER
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#if !HAVE_POLL_H
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int poll(struct pollfd *fds, nfds_t numfds, int timeout)
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{
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    fd_set read_set;
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    fd_set write_set;
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    fd_set exception_set;
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    nfds_t i;
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    int n;
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    int rc;
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#if HAVE_WINSOCK2_H
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    if (numfds >= FD_SETSIZE) {
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        errno = EINVAL;
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        return -1;
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    }
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#endif
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    FD_ZERO(&read_set);
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    FD_ZERO(&write_set);
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    FD_ZERO(&exception_set);
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    n = -1;
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    for(i = 0; i < numfds; i++) {
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        if (fds[i].fd < 0)
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            continue;
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#if !HAVE_WINSOCK2_H
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        if (fds[i].fd >= FD_SETSIZE) {
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            errno = EINVAL;
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            return -1;
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        }
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#endif
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        if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
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        if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
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        if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
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        if (fds[i].fd > n)
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            n = fds[i].fd;
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    };
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    if (n == -1)
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        /* Hey!? Nothing to poll, in fact!!! */
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        return 0;
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    if (timeout < 0)
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        rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
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    else {
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        struct timeval    tv;
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        tv.tv_sec = timeout / 1000;
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        tv.tv_usec = 1000 * (timeout % 1000);
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        rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
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    };
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    if (rc < 0)
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        return rc;
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    for(i = 0; i < (nfds_t) n; i++) {
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        fds[i].revents = 0;
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        if (FD_ISSET(fds[i].fd, &read_set))      fds[i].revents |= POLLIN;
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        if (FD_ISSET(fds[i].fd, &write_set))     fds[i].revents |= POLLOUT;
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        if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
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    };
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    return rc;
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}
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#endif /* HAVE_POLL_H */
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#endif /* CONFIG_FFSERVER */
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