#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <malloc.h>
#include <sys/iosupport.h>

#include <sys/select.h>
#include <poll.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <netinet/in.h>
#include <net/bpf.h>

#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>

#include "runtime/devices/socket.h"
#include "services/bsd.h"
#include "services/sfdnsres.h"
#include "services/nifm.h"
#include "result.h"

int _convert_errno(int bsdErrno);

__thread int h_errno;

static SfdnsresConfig g_sfdnsresConfig;
static __thread Result g_sfdnsresResult;

const struct in6_addr in6addr_any = {0};
const struct in6_addr in6addr_loopback = {.__u6_addr32 = {0, 0, 0, __builtin_bswap32(1)}};

static int _socketOpen(struct _reent *r, void *fdptr, const char *path, int flags, int mode);
static int _socketClose(struct _reent *r, void *fdptr);
static ssize_t _socketWrite(struct _reent *r, void *fdptr, const char *buf, size_t count);
static ssize_t _socketRead(struct _reent *r, void *fdptr, char *buf, size_t count);

static const devoptab_t g_socketDevoptab = {
    .name = "soc",
    .structSize   = sizeof(int),
    .open_r       = _socketOpen,
    .close_r      = _socketClose,
    .write_r      = _socketWrite,
    .read_r       = _socketRead,
    .seek_r       = NULL,
    .fstat_r      = NULL,
    .stat_r       = NULL,
    .link_r       = NULL,
    .unlink_r     = NULL,
    .chdir_r      = NULL,
    .rename_r     = NULL,
    .mkdir_r      = NULL,
    .dirStateSize = 0,
    .diropen_r    = NULL,
    .dirreset_r   = NULL,
    .dirnext_r    = NULL,
    .dirclose_r   = NULL,
    .statvfs_r    = NULL,
    .ftruncate_r  = NULL,
    .fsync_r      = NULL,
    .deviceData   = 0,
    .chmod_r      = NULL,
    .fchmod_r     = NULL,
    .rmdir_r      = NULL,
};

static const SocketInitConfig g_defaultSocketInitConfig = {
    .bsdsockets_version = 1,

    .tcp_tx_buf_size        = 0x8000,
    .tcp_rx_buf_size        = 0x10000,
    .tcp_tx_buf_max_size    = 0x40000,
    .tcp_rx_buf_max_size    = 0x40000,

    .udp_tx_buf_size = 0x2400,
    .udp_rx_buf_size = 0xA500,

    .sb_efficiency = 4,

    .serialized_out_addrinfos_max_size  = 0x1000,
    .serialized_out_hostent_max_size    = 0x200,
    .bypass_nsd                         = false,
    .dns_timeout                        = 0,
};

const SocketInitConfig *socketGetDefaultInitConfig(void) {
    return &g_defaultSocketInitConfig;
}

Result socketInitialize(const SocketInitConfig *config) {
    Result ret = 0;
    BsdInitConfig bcfg = {
        .version = config->bsdsockets_version,

        .tcp_tx_buf_size        = config->tcp_tx_buf_size,
        .tcp_rx_buf_size        = config->tcp_rx_buf_size,
        .tcp_tx_buf_max_size    = config->tcp_tx_buf_max_size,
        .tcp_rx_buf_max_size    = config->tcp_rx_buf_max_size,

        .udp_tx_buf_size = config->udp_tx_buf_size,
        .udp_rx_buf_size = config->udp_rx_buf_size,

        .sb_efficiency = config->sb_efficiency,
    };

    SfdnsresConfig sfdnsresConfig = {
        .serialized_out_addrinfos_max_size  = config->serialized_out_addrinfos_max_size,
        .serialized_out_hostent_max_size    = config->serialized_out_hostent_max_size,
        .bypass_nsd                         = config->bypass_nsd,
        .timeout                            = config->dns_timeout,
    };

    int dev = FindDevice("soc:");
    if(dev != -1)
        return MAKERESULT(Module_Libnx, LibnxError_AlreadyInitialized);

    ret = bsdInitialize(&bcfg);
    if(R_SUCCEEDED(ret))
        dev = AddDevice(&g_socketDevoptab);
    else {
        socketExit();
        return ret;
    }

    if(dev == -1) {
        socketExit();
        return MAKERESULT(Module_Libnx, LibnxError_TooManyDevOpTabs);
    }
    else {
        g_bsdResult = 0;
        g_bsdErrno = 0;

        g_sfdnsresConfig = sfdnsresConfig;
        g_sfdnsresResult = 0;
    }

    return ret;
}

void socketExit(void) {
    RemoveDevice("soc:");
    bsdExit();
}

Result socketGetLastBsdResult(void) {
    return g_bsdResult;
}

Result socketGetLastSfdnsresResult(void) {
    return g_sfdnsresResult;
}

/***********************************************************************************************************************/

static int _socketGetFd(int fd) {
    __handle *handle = __get_handle(fd);
    if(handle == NULL) {
        errno = EBADF;
        return -1;
    }
    if(strcmp(devoptab_list[handle->device]->name, "soc") != 0) {
        errno = ENOTSOCK;
        return -1;
    }
    return *(int *)handle->fileStruct;
}

static int _socketParseBsdResult(struct _reent *r, int ret) {
    int errno_;
    if(ret != -1)
        return ret; // Nothing to do
    else {
        if(g_bsdErrno == -1) {
            // We're using -1 to signal Switch error codes.
            // Note: all of the bsd:u/s handlers return 0.
            switch(g_bsdResult) {
                case 0xD201:
                    errno_ = ENFILE;
                case 0xD401:
                    errno_ = EFAULT;
                    break;
                case 0x10601:
                    errno_ = EBUSY;
                    break;
                default:
                    errno_ = EPIPE;
                    break;
            }
        }
        else
            errno_ = _convert_errno(g_bsdErrno); /* Nintendo actually used the Linux errno definitions for their FreeBSD build :)
                                                    but we still need to convert to newlib errno */
    }

    if(r == NULL)
        errno = errno_;
    else
        r->_errno = errno_;

    return -1;
}

static int _socketOpen(struct _reent *r, void *fdptr, const char *path, int flags, int mode) {
    (void)mode;
    if(strncmp(path, "soc:", 4)==0) path+= 4;
    int ret = _socketParseBsdResult(r, bsdOpen(path, flags));
    if(ret == -1)
        return ret;

    *(int *)fdptr = ret;
    return 0;
}

static int _socketClose(struct _reent *r, void *fdptr) {
    int fd = *(int *)fdptr;
    return _socketParseBsdResult(r, bsdClose(fd));
}

static ssize_t _socketWrite(struct _reent *r, void *fdptr, const char *buf, size_t count) {
    int fd = *(int *)fdptr;
    ssize_t ret = bsdWrite(fd, buf, count);

    _socketParseBsdResult(r, (int)ret);
    return ret;
}

static ssize_t _socketRead(struct _reent *r, void *fdptr, char *buf, size_t count) {
    int fd = *(int *)fdptr;
    ssize_t ret = bsdRead(fd, buf, count);

    _socketParseBsdResult(r, (int)ret);
    return ret;
}

/*
    It is way too complicated and inefficient to use devoptab with bsdSelect.
    We're therefore implementing select with poll.

    Code copied from libctru.
*/
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout) {
    struct pollfd *pollinfo;
    nfds_t numfds = 0;
    size_t i, j;
    int rc, found;

    if(nfds >= FD_SETSIZE || nfds < 0) {
        errno = EINVAL;
        return -1;
    }

    for(i = 0; i < nfds; ++i) {
        if((readfds && FD_ISSET(i, readfds))
        || (writefds && FD_ISSET(i, writefds))
        || (exceptfds && FD_ISSET(i, exceptfds)))
            ++numfds;
    }

    pollinfo = (struct pollfd*)malloc(numfds * sizeof(struct pollfd));
    if(pollinfo == NULL) {
        errno = ENOMEM;
        return -1;
    }

    for(i = 0, j = 0; i < nfds; ++i) {
        if((readfds && FD_ISSET(i, readfds))
        || (writefds && FD_ISSET(i, writefds))
        || (exceptfds && FD_ISSET(i, exceptfds))) {
            pollinfo[j].fd      = i;
            pollinfo[j].events  = 0;
            pollinfo[j].revents = 0;

            if(readfds && FD_ISSET(i, readfds))
                pollinfo[j].events |= POLLIN;
            if(writefds && FD_ISSET(i, writefds))
                pollinfo[j].events |= POLLOUT;

            ++j;
        }
    }

    if(timeout)
        rc = poll(pollinfo, numfds, timeout->tv_sec*1000 + timeout->tv_usec/1000);
    else
        rc = poll(pollinfo, numfds, -1);

    if(rc < 0) {
        free(pollinfo);
        return rc;
    }

    for(i = 0, j = 0, rc = 0; i < nfds; ++i) {
        found = 0;

        if((readfds && FD_ISSET(i, readfds))
        || (writefds && FD_ISSET(i, writefds))
        || (exceptfds && FD_ISSET(i, exceptfds))) {

            if(readfds && FD_ISSET(i, readfds)) {
                if(pollinfo[j].revents & (POLLIN|POLLHUP))
                    found = 1;
                else
                    FD_CLR(i, readfds);
            }

            if(writefds && FD_ISSET(i, writefds)) {
                if(pollinfo[j].revents & (POLLOUT|POLLHUP))
                    found = 1;
                else
                    FD_CLR(i, writefds);
            }

            if(exceptfds && FD_ISSET(i, exceptfds)) {
                if(pollinfo[j].revents & POLLERR)
                    found = 1;
                else
                    FD_CLR(i, exceptfds);
            }

            if(found)
                ++rc;
            ++j;
        }
    }

    free(pollinfo);

    return rc;
}

// This is much saner than select.
int poll(struct pollfd *fds, nfds_t nfds, int timeout) {
    struct pollfd *fds2;
    int ret = 0;

    if(fds == NULL) {
        errno = EFAULT;
        return -1;
    }

    fds2 = (struct pollfd *)malloc(nfds * sizeof(struct pollfd));
    if(fds2 == NULL) {
        errno = ENOMEM;
        return -1;
    }

    for(nfds_t i = 0; i < nfds; i++) {
        fds2[i].events = fds[i].events;
        fds2[i].revents = fds[i].revents;
        fds2[i].fd = _socketGetFd(fds[i].fd);
        if(fds2[i].fd == -1) {
            ret = -1;
            break;
        }
    }

    if(ret != -1)
        ret = _socketParseBsdResult(NULL, bsdPoll(fds2, nfds, timeout));
    if(ret != -1) {
        for(nfds_t i = 0; i < nfds; i++) {
            fds[i].events = fds2[i].events;
            fds[i].revents = fds2[i].revents;
        }
    }

    free(fds2);
    return ret;
}

int sysctl(const int *name, unsigned int namelen, void *oldp, size_t *oldlenp, const void *newp, size_t newlen) {
    return _socketParseBsdResult(NULL, bsdSysctl(name, namelen, oldp, oldlenp, newp, newlen));
}

int sysctlbyname(const char *name, void *oldp, size_t *oldlenp, const void *newp, size_t newlen) {
    int mib[CTL_MAXNAME + 2]; // +2 because most of the relevant code I've seen uses +2 as well
    size_t miblen = CTL_MAXNAME + 2;

    if(sysctlnametomib(name, mib, &miblen) == -1)
        return -1;

    return sysctl(mib, miblen, oldp, oldlenp, newp, newlen);
}

int sysctlnametomib(const char *name, int *mibp, size_t *sizep) {
    int oid[2] = {0, 3}; // sysctl.name2oid
    int ret;
    size_t oldlenp;

    if(name == NULL || mibp == NULL || sizep == NULL) {
        errno = EFAULT;
        return -1;
    }

    oldlenp = 4 * (*sizep);
    ret = sysctl(oid, 2, mibp, &oldlenp, name, strlen(name));
    *sizep = oldlenp / 4;

    return ret;
}

int socket(int domain, int type, int protocol) {
    int ret, fd, dev;

    dev = FindDevice("soc:");
    if(dev == -1)
        return -1;

    fd = __alloc_handle(dev);
    if(fd == -1)
        return -1;

    ret = _socketParseBsdResult(NULL, bsdSocket(domain, type, protocol));
    if(ret == -1) {
        __release_handle(fd);
        return -1;
    }
    else {
        *(int *)__get_handle(fd)->fileStruct = ret;
        return fd;
    }
}

ssize_t recv(int sockfd, void *buf, size_t len, int flags) {
    ssize_t ret;
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    ret = bsdRecv(sockfd, buf, len, flags);
    return _socketParseBsdResult(NULL, (int)ret);
}

ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen) {
    ssize_t ret;
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    ret = bsdRecvFrom(sockfd, buf, len, flags, src_addr, addrlen);
    return _socketParseBsdResult(NULL, (int)ret);
}

ssize_t send(int sockfd, const void* buf, size_t len, int flags) {
    ssize_t ret;
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    ret = bsdSend(sockfd, buf, len, flags);
    return _socketParseBsdResult(NULL, (int)ret);
}

ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen) {
    ssize_t ret;
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    ret = bsdSendTo(sockfd, buf, len, flags, dest_addr, addrlen);
    return _socketParseBsdResult(NULL, (int)ret);
}

int accept(int sockfd, struct sockaddr *address, socklen_t *addrlen) {
    int ret, fd, dev;

    fd = _socketGetFd(sockfd);
    if(fd == -1)
        return -1;

    dev = __get_handle(sockfd)->device;
    sockfd = fd;

    fd = __alloc_handle(dev);
    if(fd == -1)
        return -1;

    ret = _socketParseBsdResult(NULL, bsdAccept(sockfd, address, addrlen));
    if(ret == -1) {
        __release_handle(fd);
        return -1;
    }
    else {
        *(int *)__get_handle(fd)->fileStruct = ret;
        return fd;
    }
}

int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdBind(sockfd, addr, addrlen));
}

int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdConnect(sockfd, addr, addrlen));
}

int getpeername(int sockfd, struct sockaddr *addr, socklen_t *addrlen) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdGetPeerName(sockfd, addr, addrlen));
}

int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdGetSockName(sockfd, addr, addrlen));
}

int getsockopt(int sockfd, int level, int optname, void *optval, socklen_t *optlen) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdGetSockOpt(sockfd, level, optname, optval, optlen));
}

int listen(int sockfd, int backlog) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdListen(sockfd, backlog));
}

int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdSetSockOpt(sockfd, level, optname, optval, optlen));
}

int ioctl(int fd, int request, ...) {
    void *data;
    va_list args;

    va_start(args, request);
    data = (request & IOC_INOUT) ? va_arg(args, void *) : NULL;
    va_end(args);

    if(data == NULL && (request & IOC_INOUT) && IOCPARM_LEN(request) != 0) {
        errno = EFAULT;
        return -1;
    }

    fd = request != FIONBIO ? _socketGetFd(fd) : fd;
    if(fd == -1)
        return -1;

    switch(request) {
        case FIONBIO: {
            // See note in fcntl (below)
            int flags = fcntl(fd, F_GETFL, 0);
            if(flags == -1)
                return -1;
            flags = *(int *)data != 0 ? (flags | O_NONBLOCK) : (flags & ~O_NONBLOCK);
            return fcntl(fd, F_SETFL, flags);
        }
        case BIOCSETF:
        case BIOCSETWF:
        case BIOCSETFNR: {
            int ret;
            struct bpf_program *prog = (struct bpf_program *)data;
            if(prog->bf_len > BPF_MAXBUFSIZE) {
                errno = EINVAL;
                return -1;
            }

            struct bpf_program_serialized *prog_ser = (struct bpf_program_serialized *)malloc(sizeof(struct bpf_program_serialized));
            if(prog_ser == NULL) {
                errno = ENOMEM;
                return -1;
            }

            prog_ser->bf_len = prog->bf_len;
            memcpy(prog_ser->bf_insns, prog->bf_insns, prog->bf_len);

            request = _IOC(request & IOC_DIRMASK, IOCGROUP(request), IOCBASECMD(request), sizeof(struct bpf_program_serialized));
            ret = bsdIoctl(fd, request, prog_ser);
            free(prog_ser);
            return _socketParseBsdResult(NULL, ret);
        }
        default:
            return _socketParseBsdResult(NULL, bsdIoctl(fd, request, data));
    }
}

#define O_NONBLOCK_NX 0x800

#define ALL_NX   (O_NONBLOCK_NX)
#define ALL_FLAGS (O_NONBLOCK)

static int from_nx(int flags) {
    int newflags = 0;

    if(flags & O_NONBLOCK_NX)
        newflags |= O_NONBLOCK;
        /* add other flag translations here */

    return newflags;
}

static int to_nx(int flags) {
    int newflags = 0;

    if(flags & O_NONBLOCK)
        newflags |= O_NONBLOCK_NX;
    /* add other flag translations here */

    return newflags;
}


int fcntl(int fd, int cmd, ...) {
    va_list args;
    int flags=0;

    /*
        bsd:u/s only supports F_GETFL and F_SETFL with the O_NONBLOCK flag (or 0).
        F_GETFL is implemented using a custom, non-whitelisted IOCTL, whereas
        F_SETFL is implemented using FIONBIO.
    */
    if(cmd != F_GETFL && cmd != F_SETFL)
        return EOPNOTSUPP;

    if (cmd == F_SETFL) {

        va_start(args, cmd);
        flags = va_arg(args, int);
        va_end(args);

        if (flags & ~ALL_FLAGS) {
            errno = EINVAL;
            return -1;
        }
        flags = to_nx(flags);
    }

    fd = _socketGetFd(fd);
    if(fd == -1)
        return -1;

    flags = _socketParseBsdResult(NULL, bsdFcntl(fd, cmd, flags));

    if (flags & ~ALL_NX) {
        /* report unknown flags here */
    }
    return from_nx(flags);
}

int shutdown(int sockfd, int how) {
    sockfd = _socketGetFd(sockfd);
    if(sockfd == -1)
        return -1;
    return _socketParseBsdResult(NULL, bsdShutdown(sockfd, how));
}

int sockatmark(int sockfd) {
    int atmark;
    return ioctl(sockfd, SIOCATMARK, &atmark) == -1 ? -1 : atmark;
}

int socketpair(int domain, int type, int protocol, int sv[2]) {
    // Unimplementable, function definition written for compliance
    errno = ENOSYS;
    return -1;
}

ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags) {
    if(msg == NULL) {
        errno = EFAULT;
        return -1;
    }

    struct mmsghdr msgvec = {
        .msg_hdr = *msg,
        .msg_len = 1,
    };

    return recvmmsg(sockfd, &msgvec, 1, flags, NULL);
}

ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags) {
    if(msg == NULL) {
        errno = EFAULT;
        return -1;
    }

    struct mmsghdr msgvec = {
        .msg_hdr = *msg,
        .msg_len = 1,
    };

    return sendmmsg(sockfd, &msgvec, 1, flags);
}

int sendmmsg(int sockfd, struct mmsghdr *msgvec, unsigned int vlen, int flags) {
    //TODO: do the necessary RE & implement it
    errno = ENOSYS;
    return -1;
}
int recvmmsg(int sockfd, struct mmsghdr *msgvec, unsigned int vlen, int flags, struct timespec *timeout) {
    //TODO: do the necessary RE & implement it
    errno = ENOSYS;
    return -1;
}

/***********************************************************************************************************************/

// Adapted from libctru
static int _socketInetAtonDetail(int *outBase, size_t *outNumBytes, const char *cp, struct in_addr *inp) {
    int      base;
    u32      val;
    int      c;
    char     bytes[4];
    size_t   num_bytes = 0;

    c = *cp;
    for(;;) {
        if(!isdigit(c)) return 0;

        val = 0;
        base = 10;
        if(c == '0') {
            c = *++cp;
            if(c == 'x' || c == 'X') {
                base = 16;
                c = *++cp;
            }
            else base = 8;
        }

        for(;;) {
            if(isdigit(c)) {
                if(base == 8 && c >= '8') return 0;
                val *= base;
                val += c - '0';
                c    = *++cp;
            }
            else if(base == 16 && isxdigit(c)) {
                val *= base;
                val += c + 10 - (islower(c) ? 'a' : 'A');
                c    = *++cp;
            }
            else break;
        }

        if(c == '.') {
            if(num_bytes > 3) return 0;
            if(val > 0xFF) return 0;
            bytes[num_bytes++] = val;
            c = *++cp;
        }
        else break;
    }

    if(c != 0) {
        *outNumBytes = num_bytes;
        *outBase = base;
        return 0;
    }

    switch(num_bytes) {
    case 0:
        break;

    case 1:
        if(val > 0xFFFFFF) return 0;
        val |= bytes[0] << 24;
        break;

    case 2:
        if(val > 0xFFFF) return 0;
        val |= bytes[0] << 24;
        val |= bytes[1] << 16;
        break;

    case 3:
        if(val > 0xFF) return 0;
        val |= bytes[0] << 24;
        val |= bytes[1] << 16;
        val |= bytes[2] << 8;
        break;
    }

    if(inp)
        inp->s_addr = htonl(val);

    *outNumBytes = num_bytes;
    *outBase = base;

    return 1;
}

// Adapted from libctru
static const char *inet_ntop4(const void *src, char *dst, socklen_t size) {
    const u8 *ip = src;

    char *p;
    size_t i;
    unsigned int n;

    if(size < INET_ADDRSTRLEN) {
        errno = ENOSPC;
        return NULL;
    }

    for(p = dst, i = 0; i < 4; ++i) {
        if(i > 0) *p++ = '.';

        n = ip[i];
        if(n >= 100) {
            *p++ = n/100 + '0';
            n %= 100;
        }
        if(n >= 10 || ip[i] >= 100) {
            *p++ = n/10 + '0';
            n %= 10;
        }
        *p++ = n + '0';
    }
    *p = 0;

    return dst;
}

static int inet_pton4(const char *src, void *dst) {
    int base;
    size_t numBytes;

    int ret = _socketInetAtonDetail(&base, &numBytes, src, (struct in_addr *)dst);
    return (ret == 1 && base == 10 && numBytes == 3) ? 1 : 0;
}

/* Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#define INADDRSZ 4
#define IN6ADDRSZ 16
#define INT16SZ 2
/* const char *
 * inet_ntop6(src, dst, size)
 *	convert IPv6 binary address into presentation (printable) format
 * author:
 *	Paul Vixie, 1996.
 */
static const char *
inet_ntop6(src, dst, size)
    const u_char *src;
    char *dst;
    size_t size;
{
    /*
     * Note that int32_t and int16_t need only be "at least" large enough
     * to contain a value of the specified size.  On some systems, like
     * Crays, there is no such thing as an integer variable with 16 bits.
     * Keep this in mind if you think this function should have been coded
     * to use pointer overlays.  All the world's not a VAX.
     */
    char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
    struct { int base, len; } best = {0}, cur = {0};
    u_int words[IN6ADDRSZ / INT16SZ];
    int i;

    /*
     * Preprocess:
     *	Copy the input (bytewise) array into a wordwise array.
     *	Find the longest run of 0x00's in src[] for :: shorthanding.
     */
    memset(words, 0, sizeof words);
    for (i = 0; i < IN6ADDRSZ; i++)
        words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
    best.base = -1;
    cur.base = -1;
    for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
        if (words[i] == 0) {
            if (cur.base == -1)
                cur.base = i, cur.len = 1;
            else
                cur.len++;
        } else {
            if (cur.base != -1) {
                if (best.base == -1 || cur.len > best.len)
                    best = cur;
                cur.base = -1;
            }
        }
    }
    if (cur.base != -1) {
        if (best.base == -1 || cur.len > best.len)
            best = cur;
    }
    if (best.base != -1 && best.len < 2)
        best.base = -1;

    /*
     * Format the result.
     */
    tp = tmp;
    for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
        /* Are we inside the best run of 0x00's? */
        if (best.base != -1 && i >= best.base &&
            i < (best.base + best.len)) {
            if (i == best.base)
                *tp++ = ':';
            continue;
        }
        /* Are we following an initial run of 0x00s or any real hex? */
        if (i != 0)
            *tp++ = ':';
        /* Is this address an encapsulated IPv4? */
        if (i == 6 && best.base == 0 &&
            (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
            if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
                return (NULL);
            tp += strlen(tp);
            break;
        }
        //TuxSH:
        //sprintf(tp, "%x", words[i]);
        {
            char hexbuf[8];
            char *e = hexbuf + 7;
            u_int word = words[i];
            while(word > 0) {
                static const char digits[] = "0123456789abcdef";
                *e-- = digits[word & 0xF];
                word >>= 4;
            }

            memcpy(tp, e + 1, hexbuf + 8 - (e + 1));
        }
    }
    /* Was it a trailing run of 0x00's? */
    if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
        *tp++ = ':';
    *tp++ = '\0';

    /*
     * Check for overflow, copy, and we're done.
     */
    if ((tp - tmp) > size) {
        errno = ENOSPC;
        return (NULL);
    }
    strcpy(dst, tmp);
    return (dst);
}

/* int
 * inet_pton6(src, dst)
 *	convert presentation level address to network order binary form.
 * return:
 *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
 * notice:
 *	(1) does not touch `dst' unless it's returning 1.
 *	(2) :: in a full address is silently ignored.
 * credit:
 *	inspired by Mark Andrews.
 * author:
 *	Paul Vixie, 1996.
 */
static int
inet_pton6(src, dst)
    const char *src;
    u_char *dst;
{
    static const char xdigits_l[] = "0123456789abcdef",
              xdigits_u[] = "0123456789ABCDEF";
    u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
    const char *xdigits, *curtok;
    int ch, saw_xdigit;
    u_int val;

    memset((tp = tmp), 0, IN6ADDRSZ);
    endp = tp + IN6ADDRSZ;
    colonp = NULL;
    /* Leading :: requires some special handling. */
    if (*src == ':')
        if (*++src != ':')
            return (0);
    curtok = src;
    saw_xdigit = 0;
    val = 0;
    while ((ch = *src++) != '\0') {
        const char *pch;

        if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
            pch = strchr((xdigits = xdigits_u), ch);
        if (pch != NULL) {
            val <<= 4;
            val |= (pch - xdigits);
            if (val > 0xffff)
                return (0);
            saw_xdigit = 1;
            continue;
        }
        if (ch == ':') {
            curtok = src;
            if (!saw_xdigit) {
                if (colonp)
                    return (0);
                colonp = tp;
                continue;
            }
            if (tp + INT16SZ > endp)
                return (0);
            *tp++ = (u_char) (val >> 8) & 0xff;
            *tp++ = (u_char) val & 0xff;
            saw_xdigit = 0;
            val = 0;
            continue;
        }
        if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
            inet_pton4(curtok, tp) > 0) {
            tp += INADDRSZ;
            saw_xdigit = 0;
            break;	/* '\0' was seen by inet_pton4(). */
        }
        return (0);
    }
    if (saw_xdigit) {
        if (tp + INT16SZ > endp)
            return (0);
        *tp++ = (u_char) (val >> 8) & 0xff;
        *tp++ = (u_char) val & 0xff;
    }
    if (colonp != NULL) {
        /*
         * Since some memmove()'s erroneously fail to handle
         * overlapping regions, we'll do the shift by hand.
         */
        const int n = tp - colonp;
        int i;

        for (i = 1; i <= n; i++) {
            endp[- i] = colonp[n - i];
            colonp[n - i] = 0;
        }
        tp = endp;
    }
    if (tp != endp)
        return (0);
    /* bcopy(tmp, dst, IN6ADDRSZ); */
    memcpy(dst, tmp, IN6ADDRSZ);
    return (1);
}

const char *inet_ntop(int af, const void *src, char *dst, socklen_t size) {
    switch(af) {
        case AF_INET:
            return inet_ntop4(src, dst, size);
        case AF_INET6:
            return inet_ntop6(src, dst, size);
        default:
            errno = EAFNOSUPPORT;
            return NULL;
    }
}

int inet_pton(int af, const char *src, void *dst) {
    switch(af) {
        case AF_INET:
            return inet_pton4(src, dst);
        case AF_INET6:
            return inet_pton6(src, dst);
        default:
            errno = EAFNOSUPPORT;
            return -1;
    }
}

char *inet_ntoa(struct in_addr in) {
    static __thread char buffer[INET_ADDRSTRLEN];
    inet_ntop(AF_INET, &in.s_addr, buffer, INET_ADDRSTRLEN);
    return buffer;
}

int inet_aton(const char *cp, struct in_addr *inp) {
    int base;
    size_t numBytes;
    return _socketInetAtonDetail(&base, &numBytes, cp, inp);
}

in_addr_t inet_addr(const char *cp) {
    struct in_addr addr = { .s_addr = INADDR_BROADCAST };
    inet_aton(cp, &addr);
    return addr.s_addr;
}

/***********************************************************************************************************************/

static struct hostent *_socketDeserializeHostent(int *err, const void *out_he_serialized) {
    const char *buf = (const char *)out_he_serialized;
    const char *pos, *pos_aliases, *pos_addresses;
    size_t name_size, total_aliases_size = 0;
    size_t nb_addresses;
    size_t nb_aliases = 0;
    size_t nb_pos;
    size_t len;

    int addrtype, addrlen;
    struct hostent *he;

    // Calculate the size of the buffer to allocate
    pos = buf;
    name_size = strlen(pos) + 1;
    pos += name_size;

    nb_aliases = ntohl(*(const u32 *)pos);
    pos += 4;

    pos_aliases = pos;

    if(nb_aliases>0) {
        for(nb_pos=0, len = 1; nb_pos<nb_aliases; nb_pos++, pos += len + 1) {
            len = strlen(pos);
        }
    }

    total_aliases_size = pos - pos_aliases;

    // Nintendo uses unsigned short here...
    addrtype = htons(*(const u16 *)pos);
    pos += 2;
    addrlen = htons(*(const u16 *)pos);
    pos += 2;

    // sfdnsres will only return IPv4 addresses for the "host" commands
    if(addrtype != AF_INET || addrlen != sizeof(struct in_addr)) {
        *err = NO_ADDRESS;
        return NULL;
    }

    // The official hostent (de)serializer doesn't support IPv6, at least not currently.
    nb_addresses = ntohl(*(const u32 *)pos);
    pos += 4;

    pos_addresses = pos;
    pos += addrlen * nb_addresses;

    he = (struct hostent *)malloc(
        sizeof(struct hostent)
        + name_size
        + 8 * (nb_aliases + 1 + nb_addresses + 1)
        + total_aliases_size
        + addrlen * nb_addresses
    );

    if(he == NULL) {
        *err = NO_RECOVERY;
        return NULL;
    }

    he->h_aliases = (char **)(he->h_name + name_size);
    he->h_addrtype = addrtype;
    he->h_length = addrlen;
    he->h_addr_list = he->h_aliases + nb_aliases + 1;

    if(name_size == 1)
        he->h_name = NULL;
    else {
        he->h_name = (char*)he + sizeof(struct hostent);
        memcpy(he->h_name, buf, name_size);
    }

    if(nb_aliases>0) {
        char *alias = (char *)(he->h_addr_list + nb_addresses + 1);
        memcpy(alias, pos_aliases, total_aliases_size);
        for(size_t i = 0; i < nb_aliases; i++) {
            he->h_aliases[i] = alias;
            alias += strlen(alias) + 1;
        }
    }
    he->h_aliases[nb_aliases] = NULL;

    if(nb_addresses>0) {
        struct in_addr *addresses = (struct in_addr *)(he->h_addr_list + nb_addresses + 1 + total_aliases_size);
        memcpy(addresses, pos_addresses, addrlen * nb_addresses);
        for(size_t i = 0; i < nb_addresses; i++) {
            he->h_addr_list[i] = (char *)&addresses[i];
            addresses[i].s_addr = ntohl(addresses[i].s_addr); // lol Nintendo
        }
    }
    he->h_addr_list[nb_addresses] = NULL;

    return he;
}

struct addrinfo_serialized_hdr {
    u32 magic;
    int ai_flags;
    int ai_family;
    int ai_socktype;
    int ai_protocol;
    u32 ai_addrlen;
};

static size_t _socketSerializeAddrInfo(struct addrinfo_serialized_hdr *hdr, const struct addrinfo *ai) {
    size_t subsize1 = (ai->ai_addr == NULL || ai->ai_addrlen == 0) ? 4 : ai->ai_addrlen; // not posix-compliant ?
    size_t subsize2 = ai->ai_canonname == NULL ? 1 : (strlen(ai->ai_canonname) + 1);

    hdr->magic = htonl(0xBEEFCAFE); // Seriously.
    hdr->ai_flags = htonl(ai->ai_flags);
    hdr->ai_family = htonl(ai->ai_family);
    hdr->ai_socktype = htonl(ai->ai_socktype);
    hdr->ai_protocol = htonl(ai->ai_protocol);
    hdr->ai_addrlen = ai->ai_addr == NULL ? 0 : htonl((u32)ai->ai_addrlen);

    if(hdr->ai_addrlen == 0)
        *(u32 *)((u8 *)hdr + sizeof(struct addrinfo_serialized_hdr)) = 0;
    else {
        // Nintendo just byteswaps everything recursively... even fields that are already byteswapped.
        switch(ai->ai_family) {
            case AF_INET: {
                struct sockaddr_in sa = {0};
                memcpy(&sa, ai->ai_addr, subsize1 <= sizeof(struct sockaddr_in) ? subsize1 : sizeof(struct sockaddr_in));
                sa.sin_port = htons(sa.sin_port);
                sa.sin_addr.s_addr = htonl(sa.sin_addr.s_addr);
                memcpy((u8 *)hdr + sizeof(struct addrinfo_serialized_hdr), &sa, sizeof(struct sockaddr_in));
                break;
            }
            case AF_INET6: {
                struct sockaddr_in6 sa6 = {0};
                memcpy(&sa6, ai->ai_addr, subsize1 <= sizeof(struct sockaddr_in6) ? subsize1 : sizeof(struct sockaddr_in6));
                sa6.sin6_port = htons(sa6.sin6_port);
                sa6.sin6_flowinfo = htonl(sa6.sin6_flowinfo);
                sa6.sin6_scope_id = htonl(sa6.sin6_scope_id);
                memcpy((u8 *)hdr + sizeof(struct addrinfo_serialized_hdr), &sa6, sizeof(struct sockaddr_in6));
                break;
            }
            default:
                memcpy((u8 *)hdr + sizeof(struct addrinfo_serialized_hdr), ai->ai_addr, subsize1);
        }
    }

    if(ai->ai_canonname == NULL)
        *((u8 *)hdr + sizeof(struct addrinfo_serialized_hdr) + subsize1) = 0;
    else
        memcpy((u8 *)hdr + sizeof(struct addrinfo_serialized_hdr) + subsize1, ai->ai_canonname, subsize2);

    return sizeof(struct addrinfo_serialized_hdr) + subsize1 + subsize2;
}

static struct addrinfo_serialized_hdr *_socketSerializeAddrInfoList(size_t *out_size, const struct addrinfo *ai) {
    size_t total_addrlen = 0, total_namelen = 0, n = 0;
    struct addrinfo_serialized_hdr *out, *pos;

    for(const struct addrinfo *node = ai; node != NULL; node = node->ai_next) {
        total_addrlen += node->ai_addrlen == 0 ? 4 : node->ai_addrlen;
        total_namelen += node->ai_canonname == NULL ? 1 : (strlen(node->ai_canonname) + 1);
        n++;
    }

    out = (struct addrinfo_serialized_hdr *)malloc(sizeof(struct addrinfo_serialized_hdr) * n + total_addrlen + total_namelen + 4);
    if(out == NULL)
        return NULL;

    pos = out;
    for(const struct addrinfo *node = ai; node != NULL; node = node->ai_next) {
        size_t len = _socketSerializeAddrInfo(pos, node);
        pos = (struct addrinfo_serialized_hdr *)((u8 *)pos + len);
    }
    *(u32 *)pos = 0; // Sentinel value

    *out_size = (u8 *)pos - (u8 *)out + 4;
    return out;
}

static struct addrinfo *_socketDeserializeAddrInfo(size_t *out_len, const struct addrinfo_serialized_hdr *hdr) {
    struct addrinfo_node {
        struct addrinfo info;
        struct sockaddr_storage addr;
        char canonname[];
    };

    size_t subsize1 = hdr->ai_addrlen == 0 ? 4 : ntohl(hdr->ai_addrlen);
    size_t subsize2 = strlen((const char *)hdr + sizeof(struct addrinfo_serialized_hdr) + subsize1) + 1;
    struct addrinfo_node *node = (struct addrinfo_node *)malloc(sizeof(struct addrinfo_node) + subsize2);

    *out_len = sizeof(struct addrinfo_serialized_hdr) + subsize1 + subsize2;
    if(node == NULL)
        return NULL;

    node->info.ai_flags = ntohl(hdr->ai_flags);
    node->info.ai_family = ntohl(hdr->ai_family);
    node->info.ai_socktype = ntohl(hdr->ai_socktype);
    node->info.ai_protocol = ntohl(hdr->ai_protocol);
    node->info.ai_addrlen = ntohl(hdr->ai_addrlen);

    // getaddrinfo enforces addrlen = sizeof(struct sockaddr) and family = AF_INET, ie. only IPv4, anyways...
    if(node->info.ai_addrlen > sizeof(struct sockaddr_storage))
        node->info.ai_addrlen = sizeof(struct sockaddr_storage);

    if(node->info.ai_addrlen == 0)
        node->info.ai_addr = NULL;
    else {
        node->info.ai_addr = (struct sockaddr *)&node->addr;
        memcpy(node->info.ai_addr, (const u8 *)hdr + sizeof(struct addrinfo_serialized_hdr), node->info.ai_addrlen);
        // Nintendo just byteswaps everything recursively... even fields that are already byteswapped.
        switch(node->info.ai_family) {
            case AF_INET: {
                struct sockaddr_in *sa = (struct sockaddr_in *)node->info.ai_addr;
                sa->sin_port = ntohs(sa->sin_port);
                sa->sin_addr.s_addr = ntohl(sa->sin_addr.s_addr);
                break;
            }
            case AF_INET6: {
                struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)node->info.ai_addr;
                sa6->sin6_port = ntohs(sa6->sin6_port);
                sa6->sin6_flowinfo = ntohl(sa6->sin6_flowinfo);
                sa6->sin6_scope_id = ntohl(sa6->sin6_scope_id);
                break;
            }
            default:
                break;
        }
    }

    if(subsize2 == 1)
        node->info.ai_canonname = NULL;
    else {
        node->info.ai_canonname = node->canonname;
        memcpy(node->info.ai_canonname, (const u8 *)hdr + sizeof(struct addrinfo_serialized_hdr) + subsize1, subsize2);
    }

    node->info.ai_next = NULL;

    return &node->info;
}

static struct addrinfo *_socketDeserializeAddrInfoList(struct addrinfo_serialized_hdr *hdr) {
    struct addrinfo *first = NULL, *prev = NULL;

    while(hdr->magic == htonl(0xBEEFCAFE)) {
        size_t len;
        struct addrinfo *node = _socketDeserializeAddrInfo(&len, hdr);
        if(node == NULL) {
            if(first != NULL)
                freeaddrinfo(first);
            return NULL;
        }

        if(first == NULL)
            first = node;

        if(prev != NULL)
            prev->ai_next = node;

        prev = node;
        hdr = (struct addrinfo_serialized_hdr *)((u8 *)hdr + len);
    }

    return first;
}

void freehostent(struct hostent *he) {
    free(he);
}

void freeaddrinfo(struct addrinfo *ai) {
    if(ai == NULL) return; // not specified by POSIX, but that's convenient (FreeBSD does this too, etc.).
    for(struct addrinfo *node = ai, *next; node != NULL; node = next) {
        next = node->ai_next;
        free(node);
    }
}

struct hostent *gethostbyname(const char *name) {
    Result rc = 0;
    void *out_he_serialized = malloc(g_sfdnsresConfig.serialized_out_hostent_max_size);
    struct hostent *he = NULL;
    SfdnsresRequestResults ret;

    if(out_he_serialized == NULL) {
        h_errno = NO_RECOVERY;
        errno = ENOMEM; // POSIX leaves this unspecified
        goto cleanup;
    }
    rc = sfdnsresGetHostByName(&ret, &g_sfdnsresConfig, out_he_serialized, name);
    if(rc == 0xD401) {
        h_errno = NO_RECOVERY;
        errno = EFAULT; // POSIX leaves this unspecified
        goto cleanup;
    }
    else if(R_FAILED(rc) && R_MODULE(rc) == 1) { // Kernel
        h_errno = TRY_AGAIN;
        errno = EAGAIN; // POSIX leaves this unspecified
        goto cleanup;
    }
    else if(R_FAILED(rc)) {
        h_errno = NO_RECOVERY;
        errno = EINVAL; // POSIX leaves this unspecified
        goto cleanup;
    }
    if(ret.ret != NETDB_SUCCESS) {
        h_errno = ret.ret;
        errno = ret.errno_; // POSIX leaves this unspecified
        goto cleanup;
    }

    he = _socketDeserializeHostent(&h_errno, out_he_serialized);
    if(he == NULL) {
        h_errno = NO_RECOVERY;
        errno = ENOMEM; // POSIX leaves this unspecified
    }
cleanup:
    g_sfdnsresResult = rc;
    free(out_he_serialized);
    return he;
}

struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type) {
    Result rc = 0;
    void *out_he_serialized = malloc(g_sfdnsresConfig.serialized_out_hostent_max_size);
    struct hostent *he = NULL;
    SfdnsresRequestResults ret;

    if(out_he_serialized == NULL) {
        h_errno = NO_RECOVERY;
        errno = ENOMEM; // POSIX leaves this unspecified
        goto cleanup;
    }
    rc = sfdnsresGetHostByAddr(&ret, &g_sfdnsresConfig, out_he_serialized, addr, len, type);
    if(rc == 0xD401) {
        h_errno = NO_RECOVERY; // POSIX leaves this unspecified
        errno = EFAULT;
        goto cleanup;
    }
    else if(R_FAILED(rc) && R_MODULE(rc) == 1) { // Kernel
        h_errno = TRY_AGAIN;
        errno = EAGAIN; // POSIX leaves this unspecified
        goto cleanup;
    }
    else if(R_FAILED(rc)) {
        h_errno = NO_RECOVERY;
        errno = EINVAL; // POSIX leaves this unspecified
        goto cleanup;
    }
    if(ret.ret != NETDB_SUCCESS) {
        h_errno = ret.ret;
        errno = ret.errno_; // POSIX leaves this unspecified
        goto cleanup;
    }

    he = _socketDeserializeHostent(&h_errno, out_he_serialized);
    if(he == NULL) {
        h_errno = NO_RECOVERY;
        errno = ENOMEM; // POSIX leaves this unspecified
    }
cleanup:
    g_sfdnsresResult = rc;
    free(out_he_serialized);
    return he;
}

const char *hstrerror(int err) {
    static __thread char buf[0x80];
    Result rc = sfdnsresGetHostStringError(err, buf, 0x80);
    if(R_FAILED(rc)) // a bit limiting, given the broad range of errors the kernel can give to us...
        strcpy(buf, "System busy, try again.");
    g_sfdnsresResult = rc;
    return buf;
}

void herror(const char *str) {
    fprintf(stderr, "%s: %s\n", str, hstrerror(h_errno));
}

const char *gai_strerror(int err) {
    static __thread char buf[0x80];
    Result rc = sfdnsresGetGaiStringError(err, buf, 0x80);
    if(R_FAILED(rc))
        strcpy(buf, "System busy, try again.");
    g_sfdnsresResult = rc;
    return buf;
}

int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
    int gaie = 0;
    Result rc = 0;
    size_t hints_sz;
    struct addrinfo_serialized_hdr *hints_serialized = _socketSerializeAddrInfoList(&hints_sz, hints);
    struct addrinfo_serialized_hdr *out_serialized = NULL;
    struct addrinfo *out = NULL;
    SfdnsresRequestResults ret;

    if(hints_serialized == NULL) {
        gaie = EAI_MEMORY;
        goto cleanup;
    }

    out_serialized = (struct addrinfo_serialized_hdr *)malloc(g_sfdnsresConfig.serialized_out_addrinfos_max_size);

    if(out_serialized == NULL) {
        gaie = EAI_MEMORY;
        goto cleanup;
    }

    rc = sfdnsresGetAddrInfo(&ret, &g_sfdnsresConfig, node, service, hints_serialized, hints_sz, out_serialized);

    if(rc == 0xD401) {
        gaie = EAI_SYSTEM;
        errno = EFAULT;
        goto cleanup;
    }
    else if(R_FAILED(rc) && R_MODULE(rc) == 1) { // Kernel
        gaie = EAI_AGAIN;
        goto cleanup;
    }
    else if(R_FAILED(rc)) {
        gaie = EAI_FAIL;
        goto cleanup;
    }

    gaie = ret.ret;
    if(gaie != 0) {
        if(gaie == EAI_SYSTEM)
            errno = ret.errno_;
        goto cleanup;
    }

    out = _socketDeserializeAddrInfoList(out_serialized);
    if(out == NULL)
        gaie = EAI_MEMORY;
cleanup:
    *res = out;
    free(hints_serialized);
    free(out_serialized);
    g_sfdnsresResult = rc;

    return gaie;
}

int getnameinfo(const struct sockaddr *sa, socklen_t salen,
                char *host, socklen_t hostlen,
                char *serv, socklen_t servlen,
                int flags) {
    int gaie = 0;
    Result rc = 0;
    SfdnsresRequestResults ret;

    rc = sfdnsresGetNameInfo(&ret, &g_sfdnsresConfig, sa, salen, host, hostlen, serv, servlen, flags);
    if(rc == 0xD401) {
        gaie = EAI_SYSTEM;
        errno = EFAULT;
        goto cleanup;
    }
    else if(R_FAILED(rc) && R_MODULE(rc) == 1) { // Kernel
        gaie = EAI_AGAIN;
        goto cleanup;
    }
    else if(R_FAILED(rc)) {
        gaie = EAI_FAIL;
        goto cleanup;
    }


    gaie = ret.ret;
    if(gaie != 0) {
        if(gaie == EAI_SYSTEM)
            errno = ret.errno_;
    }

cleanup:
    g_sfdnsresResult = rc;
    return gaie;
}

long gethostid(void) {
    Result rc;
    u32 id;
    rc = nifmGetCurrentIpAddress(&id);
    if(R_SUCCEEDED(rc))
        return id;
    return INADDR_LOOPBACK; 
}

int gethostname(char *name, size_t namelen) {
    // The Switch doesn't have a proper name, so let's use its IP
    struct in_addr in;
    in.s_addr = gethostid();
    const char *hostname = inet_ntop(AF_INET, &in, name, namelen);
    return hostname == NULL ? -1 : 0;
}

// Unimplementable functions, left for compliance:
struct hostent *gethostent(void) { h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct netent *getnetbyaddr(uint32_t a, int b) { (void)a; (void)b; h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct netent *getnetbyname(const char *s) { (void)s; h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct netent *getnetent(void) { h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct protoent *getprotobyname(const char *s) { (void)s; h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct protoent *getprotobynumber(int a) { (void)a; h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct protoent *getprotoent(void) { h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct servent *getservbyname(const char *s1, const char *s2) { (void)s1; (void)s2; h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct servent *getservbyport(int a, const char *s) { (void)a; (void)s; h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
struct servent *getservent(void) { h_errno = NO_RECOVERY; errno = ENOSYS; return NULL; }
void sethostent(int a) { (void)a;}
void setnetent(int a) { (void)a;}
void setprotoent(int a) { (void)a; }