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8b793729fc
libnx/nx/source/runtime/devices/socket.c
jarulo 8b793729fc Fix inet_pton4
2018-06-12 13:08:27 +02:00

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#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"
__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_ = g_bsdErrno; // Nintendo actually used the Linux errno definitions for their FreeBSD build :)
}
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; }
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