/*
 * Various utilities for ffmpeg system
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
 * copyright (c) 2002 Francois Revol
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/* needed by inet_aton() */
#define _SVID_SOURCE

#include "config.h"
#include "avformat.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include "os_support.h"

#if CONFIG_NETWORK
#if !HAVE_POLL_H
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#elif HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif

#include "network.h"

#if !HAVE_INET_ATON
#include <stdlib.h>
#include <strings.h>

int inet_aton (const char * str, struct in_addr * add)
{
    unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;

    if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
        return 0;

    if (!add1 || (add1|add2|add3|add4) > 255) return 0;

    add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);

    return 1;
}
#endif /* !HAVE_INET_ATON */

#if !HAVE_GETADDRINFO
int ff_getaddrinfo(const char *node, const char *service,
                const struct addrinfo *hints, struct addrinfo **res)
{
    struct hostent *h = NULL;
    struct addrinfo *ai;
    struct sockaddr_in *sin;

#if HAVE_WINSOCK2_H
    int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
                                  const struct addrinfo *hints,
                                  struct addrinfo **res);
    HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
    win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
    if (win_getaddrinfo)
        return win_getaddrinfo(node, service, hints, res);
#endif

    *res = NULL;
    sin = av_mallocz(sizeof(struct sockaddr_in));
    if (!sin)
        return EAI_FAIL;
    sin->sin_family = AF_INET;

    if (node) {
        if (!inet_aton(node, &sin->sin_addr)) {
            if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
                av_free(sin);
                return EAI_FAIL;
            }
            h = gethostbyname(node);
            if (!h) {
                av_free(sin);
                return EAI_FAIL;
            }
            memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
        }
    } else {
        if (hints && (hints->ai_flags & AI_PASSIVE)) {
            sin->sin_addr.s_addr = INADDR_ANY;
        } else
            sin->sin_addr.s_addr = INADDR_LOOPBACK;
    }

    /* Note: getaddrinfo allows service to be a string, which
     * should be looked up using getservbyname. */
    if (service)
        sin->sin_port = htons(atoi(service));

    ai = av_mallocz(sizeof(struct addrinfo));
    if (!ai) {
        av_free(sin);
        return EAI_FAIL;
    }

    *res = ai;
    ai->ai_family = AF_INET;
    ai->ai_socktype = hints ? hints->ai_socktype : 0;
    switch (ai->ai_socktype) {
    case SOCK_STREAM: ai->ai_protocol = IPPROTO_TCP; break;
    case SOCK_DGRAM:  ai->ai_protocol = IPPROTO_UDP; break;
    default:          ai->ai_protocol = 0;           break;
    }

    ai->ai_addr = (struct sockaddr *)sin;
    ai->ai_addrlen = sizeof(struct sockaddr_in);
    if (hints && (hints->ai_flags & AI_CANONNAME))
        ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;

    ai->ai_next = NULL;
    return 0;
}

void ff_freeaddrinfo(struct addrinfo *res)
{
#if HAVE_WINSOCK2_H
    void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
    HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
    win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
                       GetProcAddress(ws2mod, "freeaddrinfo");
    if (win_freeaddrinfo) {
        win_freeaddrinfo(res);
        return;
    }
#endif

    av_free(res->ai_canonname);
    av_free(res->ai_addr);
    av_free(res);
}

int ff_getnameinfo(const struct sockaddr *sa, int salen,
                   char *host, int hostlen,
                   char *serv, int servlen, int flags)
{
    const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;

#if HAVE_WINSOCK2_H
    int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
                                  char *host, DWORD hostlen,
                                  char *serv, DWORD servlen, int flags);
    HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
    win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
    if (win_getnameinfo)
        return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
#endif

    if (sa->sa_family != AF_INET)
        return EAI_FAMILY;
    if (!host && !serv)
        return EAI_NONAME;

    if (host && hostlen > 0) {
        struct hostent *ent = NULL;
        uint32_t a;
        if (!(flags & NI_NUMERICHOST))
            ent = gethostbyaddr((const char *)&sin->sin_addr,
                                sizeof(sin->sin_addr), AF_INET);

        if (ent) {
            snprintf(host, hostlen, "%s", ent->h_name);
        } else if (flags & NI_NAMERQD) {
            return EAI_NONAME;
        } else {
            a = ntohl(sin->sin_addr.s_addr);
            snprintf(host, hostlen, "%d.%d.%d.%d",
                     ((a >> 24) & 0xff), ((a >> 16) & 0xff),
                     ((a >>  8) & 0xff), ( a        & 0xff));
        }
    }

    if (serv && servlen > 0) {
        struct servent *ent = NULL;
        if (!(flags & NI_NUMERICSERV))
            ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");

        if (ent) {
            snprintf(serv, servlen, "%s", ent->s_name);
        } else
            snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
    }

    return 0;
}

const char *ff_gai_strerror(int ecode)
{
    switch(ecode) {
    case EAI_FAIL   : return "A non-recoverable error occurred";
    case EAI_FAMILY : return "The address family was not recognized or the address length was invalid for the specified family";
    case EAI_NONAME : return "The name does not resolve for the supplied parameters";
    }

    return "Unknown error";
}
#endif

/* resolve host with also IP address parsing */
int resolve_host(struct in_addr *sin_addr, const char *hostname)
{

    if (!inet_aton(hostname, sin_addr)) {
#if HAVE_GETADDRINFO
        struct addrinfo *ai, *cur;
        struct addrinfo hints;
        memset(&hints, 0, sizeof(hints));
        hints.ai_family = AF_INET;
        if (getaddrinfo(hostname, NULL, &hints, &ai))
            return -1;
        /* getaddrinfo returns a linked list of addrinfo structs.
         * Even if we set ai_family = AF_INET above, make sure
         * that the returned one actually is of the correct type. */
        for (cur = ai; cur; cur = cur->ai_next) {
            if (cur->ai_family == AF_INET) {
                *sin_addr = ((struct sockaddr_in *)cur->ai_addr)->sin_addr;
                freeaddrinfo(ai);
                return 0;
            }
        }
        freeaddrinfo(ai);
        return -1;
#else
        struct hostent *hp;
        hp = gethostbyname(hostname);
        if (!hp)
            return -1;
        memcpy(sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
#endif
    }
    return 0;
}

int ff_socket_nonblock(int socket, int enable)
{
#if HAVE_WINSOCK2_H
   return ioctlsocket(socket, FIONBIO, &enable);
#else
   if (enable)
      return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
   else
      return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
#endif
}
#endif /* CONFIG_NETWORK */

#if CONFIG_FFSERVER
#if !HAVE_POLL_H
int poll(struct pollfd *fds, nfds_t numfds, int timeout)
{
    fd_set read_set;
    fd_set write_set;
    fd_set exception_set;
    nfds_t i;
    int n;
    int rc;

#if HAVE_WINSOCK2_H
    if (numfds >= FD_SETSIZE) {
        errno = EINVAL;
        return -1;
    }
#endif

    FD_ZERO(&read_set);
    FD_ZERO(&write_set);
    FD_ZERO(&exception_set);

    n = -1;
    for(i = 0; i < numfds; i++) {
        if (fds[i].fd < 0)
            continue;
#if !HAVE_WINSOCK2_H
        if (fds[i].fd >= FD_SETSIZE) {
            errno = EINVAL;
            return -1;
        }
#endif

        if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
        if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
        if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);

        if (fds[i].fd > n)
            n = fds[i].fd;
    };

    if (n == -1)
        /* Hey!? Nothing to poll, in fact!!! */
        return 0;

    if (timeout < 0)
        rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
    else {
        struct timeval    tv;

        tv.tv_sec = timeout / 1000;
        tv.tv_usec = 1000 * (timeout % 1000);
        rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
    };

    if (rc < 0)
        return rc;

    for(i = 0; i < (nfds_t) n; i++) {
        fds[i].revents = 0;

        if (FD_ISSET(fds[i].fd, &read_set))      fds[i].revents |= POLLIN;
        if (FD_ISSET(fds[i].fd, &write_set))     fds[i].revents |= POLLOUT;
        if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
    };

    return rc;
}
#endif /* HAVE_POLL_H */
#endif /* CONFIG_FFSERVER */