/*

 * various OS-feature replacement utilities

 * 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 _DEFAULT_SOURCE

#define _SVID_SOURCE

#include "config.h"

#include "libavutil/mem.h"

#include "avformat.h"

#include "os_support.h"

#if CONFIG_NETWORK

#include <fcntl.h>

#if !HAVE_POLL_H

#if HAVE_SYS_TIME_H

#include <sys/time.h>

#endif /* HAVE_SYS_TIME_H */

#if HAVE_SYS_SELECT_H

#include <sys/select.h>

#endif /* HAVE_SYS_SELECT_H */

#endif /* !HAVE_POLL_H */

#include "network.h"

#if !HAVE_GETADDRINFO

#if !HAVE_INET_ATON

#include <stdlib.h>

static 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 */

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;

    *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)

{

    av_freep(&res->ai_canonname);

    av_freep(&res->ai_addr);

    av_freep(&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 (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) {

        if (!(flags & NI_NUMERICSERV))

            return EAI_FAIL;

        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));

    }

    return 0;

}

#endif /* !HAVE_GETADDRINFO */

#if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H

const char *ff_gai_strerror(int ecode)

{

    switch (ecode) {

    case EAI_AGAIN:

        return "Temporary failure in name resolution";

    case EAI_BADFLAGS:

        return "Invalid flags for ai_flags";

    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_MEMORY:

        return "Memory allocation failure";

#if EAI_NODATA != EAI_NONAME

    case EAI_NODATA:

        return "No address associated with hostname";

#endif /* EAI_NODATA != EAI_NONAME */

    case EAI_NONAME:

        return "The name does not resolve for the supplied parameters";

    case EAI_SERVICE:

        return "servname not supported for ai_socktype";

    case EAI_SOCKTYPE:

        return "ai_socktype not supported";

    }

    return "Unknown error";

}

#endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */

int ff_socket_nonblock(int socket, int enable)

{

#if HAVE_WINSOCK2_H

    u_long param = enable;

    return ioctlsocket(socket, FIONBIO, &param);

#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 /* HAVE_WINSOCK2_H */

}

#if !HAVE_POLL_H

int ff_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 /* HAVE_WINSOCK2_H */

    FD_ZERO(&read_set);

    FD_ZERO(&write_set);

    FD_ZERO(&exception_set);

    n = 0;

    for (i = 0; i < numfds; i++) {

#if !HAVE_WINSOCK2_H

        if (fds[i].fd < 0)

            continue;

        if (fds[i].fd >= FD_SETSIZE) {

            errno = EINVAL;

            return -1;

        }

#else

        if (fds[i].fd == INVALID_SOCKET)

            continue;

#endif /* !HAVE_WINSOCK2_H */

        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 + 1;

    }

    if (n == 0)

        /* Hey!? Nothing to poll, in fact!!! */

        return 0;

    if (timeout < 0) {

        rc = select(n, &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, &read_set, &write_set, &exception_set, &tv);

    }

    if (rc < 0)

        return rc;

    for (i = 0; i < numfds; 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_NETWORK */