luasocket/src/usocket.c

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/*=========================================================================*\
* Socket compatibilization module for Unix
* LuaSocket toolkit
*
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* We are now treating EINTRs, but if an interrupt happens in the middle of
* a select function call, we don't guarantee values timeouts anymore.
* It's not a big deal, since we are not real-time anyways.
*
* We also exchanged the order of the calls to send/recv and select.
* The idea is that the outer loop (whoever is calling sock_send/recv)
* will call the function again if we didn't time out, so we can
* call write and then select only if it fails. This moves the penalty
* to when data is not available, maximizing the bandwidth if data is
* always available.
*
* RCS ID: $Id$
\*=========================================================================*/
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#include <string.h>
#include <signal.h>
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#include "socket.h"
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static const char *sock_createstrerror(int err);
static const char *sock_bindstrerror(int err);
static const char *sock_connectstrerror(int err);
static const char *sock_acceptstrerror(int err);
static const char *sock_listenstrerror(int err);
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int sock_open(void)
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{
#if DOESNT_COMPILE_TRY_THIS
struct sigaction ignore;
memset(&ignore, 0, sizeof(ignore));
ignore.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &ignore, NULL);
#endif
/* instals a handler to ignore sigpipe or it will crash us */
signal(SIGPIPE, SIG_IGN);
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return 1;
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}
/*-------------------------------------------------------------------------*\
* Close and inutilize socket
\*-------------------------------------------------------------------------*/
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void sock_destroy(p_sock ps)
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{
if (*ps != SOCK_INVALID) {
sock_setblocking(ps);
close(*ps);
*ps = SOCK_INVALID;
}
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}
/*-------------------------------------------------------------------------*\
* Select with int timeout in ms
\*-------------------------------------------------------------------------*/
int sock_select(int n, fd_set *rfds, fd_set *wfds, fd_set *efds, int timeout)
{
struct timeval tv;
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
return select(n, rfds, wfds, efds, timeout >= 0? &tv: NULL);
}
/*-------------------------------------------------------------------------*\
* Creates and sets up a socket
\*-------------------------------------------------------------------------*/
const char *sock_create(p_sock ps, int domain, int type, int protocol)
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{
t_sock sock = socket(domain, type, protocol);
if (sock == SOCK_INVALID) return sock_createstrerror(errno);
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*ps = sock;
sock_setnonblocking(ps);
return NULL;
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}
/*-------------------------------------------------------------------------*\
* Connects or returns error message
\*-------------------------------------------------------------------------*/
const char *sock_connect(p_sock ps, SA *addr, socklen_t addr_len, p_tm tm)
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{
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t_sock sock = *ps;
int err;
/* don't call on closed socket */
if (sock == SOCK_INVALID) return io_strerror(IO_CLOSED);
/* ask system to connect */
err = connect(sock, addr, addr_len);
/* if no error, we're done */
if (err == 0) return NULL;
/* make sure the system is trying to connect */
if (errno != EINPROGRESS) return sock_connectstrerror(errno);
/* wait for a timeout or for the system's answer */
for ( ;; ) {
fd_set rfds, wfds, efds;
FD_ZERO(&rfds); FD_SET(sock, &rfds);
FD_ZERO(&wfds); FD_SET(sock, &wfds);
FD_ZERO(&efds); FD_SET(sock, &efds);
/* we run select to avoid busy waiting */
do err = sock_select(sock+1, &rfds, &wfds, &efds, tm_getretry(tm));
while (err < 0 && errno == EINTR);
/* if selects readable, try reading */
if (err > 0) {
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char dummy;
/* recv will set errno to the value a blocking connect would set */
if (recv(sock, &dummy, 0, 0) < 0 && errno != EWOULDBLOCK)
return sock_connectstrerror(errno);
else
return NULL;
/* if no event happened, there was a timeout */
} else return io_strerror(IO_TIMEOUT);
}
return io_strerror(IO_TIMEOUT); /* can't get here */
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}
/*-------------------------------------------------------------------------*\
* Binds or returns error message
\*-------------------------------------------------------------------------*/
const char *sock_bind(p_sock ps, SA *addr, socklen_t addr_len)
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{
const char *err = NULL;
sock_setblocking(ps);
if (bind(*ps, addr, addr_len) < 0) err = sock_bindstrerror(errno);
sock_setnonblocking(ps);
return err;
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}
/*-------------------------------------------------------------------------*\
*
\*-------------------------------------------------------------------------*/
const char* sock_listen(p_sock ps, int backlog)
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{
const char *err = NULL;
sock_setblocking(ps);
if (listen(*ps, backlog))
err = sock_listenstrerror(errno);
sock_setnonblocking(ps);
return err;
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}
/*-------------------------------------------------------------------------*\
*
\*-------------------------------------------------------------------------*/
void sock_shutdown(p_sock ps, int how)
{
sock_setblocking(ps);
shutdown(*ps, how);
sock_setnonblocking(ps);
}
/*-------------------------------------------------------------------------*\
* Accept with timeout
\*-------------------------------------------------------------------------*/
const char *sock_accept(p_sock ps, p_sock pa, SA *addr,
socklen_t *addr_len, p_tm tm)
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{
t_sock sock = *ps;
SA dummy_addr;
socklen_t dummy_len = sizeof(dummy_addr);
if (sock == SOCK_INVALID) return io_strerror(IO_CLOSED);
if (!addr) addr = &dummy_addr;
if (!addr_len) addr_len = &dummy_len;
for (;;) {
int err;
fd_set fds;
/* try to accept */
*pa = accept(sock, addr, addr_len);
/* if result is valid, we are done */
if (*pa != SOCK_INVALID) return NULL;
/* find out if we failed for a fatal reason */
if (errno != EWOULDBLOCK && errno != ECONNABORTED)
return sock_acceptstrerror(errno);
/* call select to avoid busy-wait. */
FD_ZERO(&fds);
FD_SET(sock, &fds);
do err = sock_select(sock+1, &fds, NULL, NULL, tm_getretry(tm));
while (err < 0 && errno == EINTR);
if (err == 0) return io_strerror(IO_TIMEOUT);
}
return io_strerror(IO_TIMEOUT); /* can't get here */
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}
/*-------------------------------------------------------------------------*\
* Send with timeout
\*-------------------------------------------------------------------------*/
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int sock_send(p_sock ps, const char *data, size_t count, size_t *sent,
int timeout)
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{
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t_sock sock = *ps;
ssize_t put;
/* avoid making system calls on closed sockets */
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if (sock == SOCK_INVALID) return IO_CLOSED;
/* make sure we repeat in case the call was interrupted */
do put = send(sock, data, count, 0);
while (put < 0 && errno == EINTR);
/* deal with failure */
if (put <= 0) {
fd_set fds;
/* in any case, nothing has been sent */
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*sent = 0;
/* here we know the connection has been closed */
if (errno == EPIPE) return IO_CLOSED;
/* run select to avoid busy wait */
FD_ZERO(&fds);
FD_SET(sock, &fds);
if (sock_select(sock+1, NULL, &fds, NULL, timeout) <= 0) {
/* here the call was interrupted. calling again might work */
if (errno == EINTR) return IO_RETRY;
/* here there was no data before timeout */
else return IO_TIMEOUT;
/* here we didn't send anything, but now we can */
} else return IO_DONE;
/* here we successfully sent something */
} else {
*sent = put;
return IO_DONE;
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}
}
/*-------------------------------------------------------------------------*\
* Sendto with timeout
\*-------------------------------------------------------------------------*/
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int sock_sendto(p_sock ps, const char *data, size_t count, size_t *sent,
SA *addr, socklen_t addr_len, int timeout)
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{
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t_sock sock = *ps;
ssize_t put;
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if (sock == SOCK_INVALID) return IO_CLOSED;
do put = sendto(sock, data, count, 0, addr, addr_len);
while (put < 0 && errno == EINTR);
if (put <= 0) {
fd_set fds;
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*sent = 0;
if (errno == EPIPE) return IO_CLOSED;
FD_ZERO(&fds);
FD_SET(sock, &fds);
if (sock_select(sock+1, NULL, &fds, NULL, timeout) <= 0) {
if (errno == EINTR) return IO_RETRY;
else return IO_TIMEOUT;
} else return IO_DONE;
} else {
*sent = put;
return IO_DONE;
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}
}
/*-------------------------------------------------------------------------*\
* Receive with timeout
\*-------------------------------------------------------------------------*/
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int sock_recv(p_sock ps, char *data, size_t count, size_t *got, int timeout)
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{
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t_sock sock = *ps;
ssize_t taken;
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if (sock == SOCK_INVALID) return IO_CLOSED;
do taken = read(sock, data, count);
while (taken < 0 && errno == EINTR);
if (taken <= 0) {
fd_set fds;
int ret;
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*got = 0;
if (taken == 0) return IO_CLOSED;
FD_ZERO(&fds);
FD_SET(sock, &fds);
ret = sock_select(sock+1, &fds, NULL, NULL, timeout);
if (ret < 0 && errno == EINTR) return IO_RETRY;
if (ret == 0) return IO_TIMEOUT;
else return IO_DONE;
} else {
*got = taken;
return IO_DONE;
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}
}
/*-------------------------------------------------------------------------*\
* Recvfrom with timeout
\*-------------------------------------------------------------------------*/
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int sock_recvfrom(p_sock ps, char *data, size_t count, size_t *got,
SA *addr, socklen_t *addr_len, int timeout)
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{
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t_sock sock = *ps;
ssize_t taken;
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if (sock == SOCK_INVALID) return IO_CLOSED;
do taken = recvfrom(sock, data, count, 0, addr, addr_len);
while (taken < 0 && errno == EINTR);
if (taken <= 0) {
fd_set fds;
int ret;
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*got = 0;
if (taken == 0) return IO_CLOSED;
FD_ZERO(&fds);
FD_SET(sock, &fds);
ret = sock_select(sock+1, &fds, NULL, NULL, timeout);
if (ret < 0 && errno == EINTR) return IO_RETRY;
if (ret == 0) return IO_TIMEOUT;
else return IO_DONE;
} else {
*got = taken;
return IO_DONE;
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}
}
/*-------------------------------------------------------------------------*\
* Put socket into blocking mode
\*-------------------------------------------------------------------------*/
void sock_setblocking(p_sock ps)
{
int flags = fcntl(*ps, F_GETFL, 0);
flags &= (~(O_NONBLOCK));
fcntl(*ps, F_SETFL, flags);
}
/*-------------------------------------------------------------------------*\
* Put socket into non-blocking mode
\*-------------------------------------------------------------------------*/
void sock_setnonblocking(p_sock ps)
{
int flags = fcntl(*ps, F_GETFL, 0);
flags |= O_NONBLOCK;
fcntl(*ps, F_SETFL, flags);
}
/*-------------------------------------------------------------------------*\
* Error translation functions
\*-------------------------------------------------------------------------*/
/* return error messages for the known errors reported by gethostbyname */
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const char *sock_hoststrerror(void)
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{
switch (h_errno) {
case HOST_NOT_FOUND: return "host not found";
case NO_ADDRESS: return "valid host but no ip found";
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case NO_RECOVERY: return "name server error";
case TRY_AGAIN: return "name server unavailable, try again later";
default: return "unknown error";
}
}
/* return error messages for the known errors reported by socket */
static const char *sock_createstrerror(int err)
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{
switch (err) {
case EPROTONOSUPPORT: return "protocol not supported";
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case EACCES: return "access denied";
case EMFILE: return "process file table is full";
case ENFILE: return "kernel file table is full";
case EINVAL: return "unknown protocol or family";
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case ENOBUFS: return "insuffucient buffer space";
default: return "unknown error";
}
}
/* return error messages for the known errors reported by accept */
static const char *sock_acceptstrerror(int err)
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{
switch (err) {
case EWOULDBLOCK: return io_strerror(IO_RETRY);
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case EBADF: return "invalid descriptor";
case ENOBUFS: case ENOMEM: return "insuffucient buffer space";
case ENOTSOCK: return "descriptor not a socket";
case EOPNOTSUPP: return "not supported";
case EINTR: return "call interrupted";
case ECONNABORTED: return "connection aborted";
case EINVAL: return "not listening";
case EMFILE: return "process file table is full";
case ENFILE: return "kernel file table is full";
case EFAULT: return "invalid memory address";
default: return "unknown error";
}
}
/* return error messages for the known errors reported by bind */
static const char *sock_bindstrerror(int err)
{
switch (err) {
case EBADF: return "invalid descriptor";
case ENOTSOCK: return "descriptor not a socket";
case EADDRNOTAVAIL: return "address unavailable in local host";
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case EADDRINUSE: return "address already in use";
case EINVAL: return "already bound";
case EACCES: return "access denied";
case EFAULT: return "invalid memory address";
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case ENOMEM: return "out of memory";
default: return "unknown error";
}
}
/* return error messages for the known errors reported by listen */
static const char *sock_listenstrerror(int err)
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{
switch (err) {
case EADDRINUSE: return "local address already in use";
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case EBADF: return "invalid descriptor";
case ENOTSOCK: return "descriptor not a socket";
case EOPNOTSUPP: return "not supported";
default: return "unknown error";
}
}
/* return error messages for the known errors reported by connect */
static const char *sock_connectstrerror(int err)
{
switch (err) {
case EBADF: return "invalid descriptor";
case EFAULT: return "invalid memory address";
case ENOTSOCK: return "descriptor not a socket";
case EADDRNOTAVAIL: return "address not available in local host";
case EISCONN: return "already connected";
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case ECONNREFUSED: return "connection refused";
case ETIMEDOUT: return io_strerror(IO_TIMEOUT);
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case ENETUNREACH: return "network is unreachable";
case EADDRINUSE: return "local address already in use";
case EINPROGRESS: return "would block";
case EALREADY: return "connect already in progress";
case EAGAIN: return "not enough free ports";
case EAFNOSUPPORT: return "address family not supported";
case EPERM: return "broadcast not enabled or firewall block";
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default: return "unknown error";
}
}