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socket.c
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socket.c
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/*-------
* Module: socket.c
*
* Description: This module contains functions for low level socket
* operations (connecting/reading/writing to the backend)
*
* Classes: SocketClass (Functions prefix: "SOCK_")
*
* API functions: none
*
* Comments: See "notice.txt" for copyright and license information.
*-------
*/
#include "psqlodbc.h"
#ifdef USE_SSPI
#include "sspisvcs.h"
#endif /* USE_SSPI */
#ifdef USE_GSS
#include "gsssvcs.h"
#endif /* USE_GSS */
#ifndef NOT_USE_LIBPQ
#include <libpq-fe.h>
#ifdef USE_SSL
#include <openssl/ssl.h>
#endif /* USE_SSL */
#endif /* NOT_USE_LIBPQ */
#include "socket.h"
#include "loadlib.h"
#include "connection.h"
#ifdef WIN32
#include <time.h>
#include <Wspiapi.h>
#else
#include <stdlib.h>
#include <string.h> /* for memset */
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif /* HAVE_SYS_TIME_H */
#endif /* TIME_WITH__SYS_TIME */
#endif /* WIN32 */
extern GLOBAL_VALUES globals;
static int SOCK_get_next_n_bytes(SocketClass *s, int n, char *buf);
static void SOCK_set_error(SocketClass *s, int _no, const char *_msg)
{
int gerrno = SOCK_ERRNO;
s->errornumber = _no;
if (NULL != s->_errormsg_)
free(s->_errormsg_);
if (NULL != _msg)
s->_errormsg_ = strdup(_msg);
else
s->_errormsg_ = NULL;
mylog("(%d)%s ERRNO=%d\n", _no, _msg, gerrno);
}
void
SOCK_clear_error(SocketClass *self)
{
self->errornumber = 0;
if (NULL != self->_errormsg_)
free(self->_errormsg_);
self->_errormsg_ = NULL;
}
SocketClass *
SOCK_Constructor(const ConnectionClass *conn)
{
SocketClass *rv;
rv = (SocketClass *) malloc(sizeof(SocketClass));
if (rv != NULL)
{
rv->socket = (SOCKETFD) -1;
#ifdef USE_SSPI
rv->ssd = NULL;
rv->sspisvcs = 0;
#endif /* USE_SSPI */
#ifdef USE_GSS
rv->gctx = NULL;
rv->gtarg_nam = NULL;
#endif /* USE_GSS */
#ifndef NOT_USE_LIBPQ
rv->via_libpq = FALSE;
#ifdef USE_SSL
rv->ssl = NULL;
#endif
rv->pqconn = NULL;
#endif /* NOT_USE_LIBPQ */
rv->pversion = 0;
rv->reslen = 0;
rv->buffer_filled_in = 0;
rv->buffer_filled_out = 0;
rv->buffer_read_in = 0;
if (conn)
rv->buffer_size = conn->connInfo.drivers.socket_buffersize;
else
rv->buffer_size = globals.socket_buffersize;
rv->buffer_in = (UCHAR *) malloc(rv->buffer_size);
if (!rv->buffer_in)
{
free(rv);
return NULL;
}
rv->buffer_out = (UCHAR *) malloc(rv->buffer_size);
if (!rv->buffer_out)
{
free(rv->buffer_in);
free(rv);
return NULL;
}
rv->_errormsg_ = NULL;
rv->errornumber = 0;
rv->reverse = FALSE;
}
return rv;
}
void
SOCK_Destructor(SocketClass *self)
{
mylog("SOCK_Destructor\n");
if (!self)
return;
#ifndef NOT_USE_LIBPQ
if (self->pqconn)
{
if (self->via_libpq)
{
PQfinish(self->pqconn);
/* UnloadDelayLoadedDLLs(NULL != self->ssl); */
}
self->via_libpq = FALSE;
self->pqconn = NULL;
#ifdef USE_SSL
self->ssl = NULL;
#endif
}
else
#endif /* NOT_USE_LIBPQ */
{
if (self->socket != (SOCKETFD) -1)
{
SOCK_put_char(self, 'X');
if (PG_PROTOCOL_74 == self->pversion)
SOCK_put_int(self, 4, 4);
SOCK_flush_output(self);
closesocket(self->socket);
}
#ifdef USE_SSPI
if (self->ssd)
{
ReleaseSvcSpecData(self, (UInt4) -1);
free(self->ssd);
self->ssd = NULL;
}
self->sspisvcs = 0;
#endif /* USE_SSPI */
#ifdef USE_GSS
pg_GSS_cleanup(self);
#endif /* USE_GSS */
}
if (self->buffer_in)
free(self->buffer_in);
if (self->buffer_out)
free(self->buffer_out);
if (self->_errormsg_)
free(self->_errormsg_);
free(self);
}
#if defined(_MSC_VER) && (_MSC_VER < 1300)
static freeaddrinfo_func freeaddrinfo_ptr = NULL;
static getaddrinfo_func getaddrinfo_ptr = NULL;
static getnameinfo_func getnameinfo_ptr = NULL;
static HMODULE ws2_hnd = NULL;
#else
static freeaddrinfo_func freeaddrinfo_ptr = freeaddrinfo;
static getaddrinfo_func getaddrinfo_ptr = getaddrinfo;
#endif /* _MSC_VER */
static BOOL format_sockerr(char *errmsg, size_t buflen, int errnum, const char *cmd, const char *host, int portno)
{
BOOL ret = FALSE;
#ifdef WIN32
if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL,
errnum, MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
errmsg, (DWORD)buflen, NULL))
ret = TRUE;
#else
#if defined(POSIX_MULTITHREAD_SUPPORT) && defined(HAVE_STRERROR_R)
#ifdef STRERROR_R_CHAR_P
const char *pchar;
pchar = (const char *) strerror_r(errnum, errmsg, buflen);
if (NULL != pchar)
{
if (pchar != errmsg)
strncpy_null(errmsg, pchar, buflen);
ret = TRUE;
}
#else
if (0 == strerror_r(errnum, errmsg, buflen))
ret = TRUE;
#endif /* STRERROR_R_CHAR_P */
#else
strncpy_null(errmsg, strerror(errnum), buflen);
ret = TRUE;
#endif /* POSIX_MULTITHREAD_SUPPORT */
#endif /* WIN32 */
if (ret)
{
size_t tlen = strlen(errmsg);
errmsg += tlen;
buflen -= tlen;
snprintf(errmsg, buflen, " [%s:%d]", host, portno);
}
else
snprintf(errmsg, buflen, "%s failed for [%s:%d] ", cmd, host, portno);
return ret;
}
char
SOCK_connect_to(SocketClass *self, unsigned short port, char *hostname, long timeout)
{
struct addrinfo rest, *addrs = NULL, *curadr = NULL;
int family = 0;
char retval = 0;
int gerrno;
if (self->socket != (SOCKETFD) -1)
{
SOCK_set_error(self, SOCKET_ALREADY_CONNECTED, "Socket is already connected");
return 0;
}
#if defined(_MSC_VER) && (_MSC_VER < 1300)
if (ws2_hnd == NULL)
ws2_hnd = GetModuleHandle("ws2_32.dll");
if (freeaddrinfo_ptr == NULL)
freeaddrinfo_ptr = (freeaddrinfo_func)GetProcAddress(ws2_hnd, "freeaddrinfo");
if (getaddrinfo_ptr == NULL)
getaddrinfo_ptr = (getaddrinfo_func)GetProcAddress(ws2_hnd, "getaddrinfo");
if (getnameinfo_ptr == NULL)
getnameinfo_ptr = (getnameinfo_func)GetProcAddress(ws2_hnd, "getnameinfo");
#endif
/*
* Hostname lookup.
*/
if (hostname && hostname[0]
#ifndef WIN32
&& '/' != hostname[0]
#endif /* WIN32 */
)
{
char portstr[16];
int ret;
memset(&rest, 0, sizeof(rest));
rest.ai_socktype = SOCK_STREAM;
rest.ai_family = AF_UNSPEC;
snprintf(portstr, sizeof(portstr), "%d", port);
if (inet_addr(hostname) != INADDR_NONE)
rest.ai_flags |= AI_NUMERICHOST;
ret = getaddrinfo_ptr(hostname, portstr, &rest, &addrs);
if (ret || !addrs)
{
SOCK_set_error(self, SOCKET_HOST_NOT_FOUND, "Could not resolve hostname.");
if (addrs)
freeaddrinfo_ptr(addrs);
return 0;
}
curadr = addrs;
}
else
#ifdef HAVE_UNIX_SOCKETS
{
struct sockaddr_un *un = (struct sockaddr_un *) &(self->sadr_area);
family = un->sun_family = AF_UNIX;
/* passing NULL or '' means pg default "/tmp" */
UNIXSOCK_PATH(un, port, hostname);
self->sadr_len = UNIXSOCK_LEN(un);
}
#else
{
SOCK_set_error(self, SOCKET_HOST_NOT_FOUND, "Hostname isn't specified.");
return 0;
}
#endif /* HAVE_UNIX_SOCKETS */
retry:
if (curadr)
family = curadr->ai_family;
self->socket = socket(family, SOCK_STREAM, 0);
if (self->socket == (SOCKETFD) -1)
{
SOCK_set_error(self, SOCKET_COULD_NOT_CREATE_SOCKET, "Could not create Socket.");
goto cleanup;
}
#ifdef TCP_NODELAY
if (family != AF_UNIX)
{
int i;
socklen_t len;
i = 1;
len = sizeof(i);
if (setsockopt(self->socket, IPPROTO_TCP, TCP_NODELAY, (char *) &i, len) < 0)
{
SOCK_set_error(self, SOCKET_COULD_NOT_CONNECT, "Could not set socket to NODELAY.");
goto cleanup;
}
}
#endif /* TCP_NODELAY */
#ifdef WIN32
{
long ioctlsocket_ret = 1;
/* Returns non-0 on failure, while fcntl() returns -1 on failure */
ioctlsocket(self->socket, FIONBIO, &ioctlsocket_ret);
}
#else
fcntl(self->socket, F_SETFL, O_NONBLOCK);
#endif
if (curadr)
{
struct sockaddr *in = (struct sockaddr *) &(self->sadr_area);
memset((char *) in, 0, sizeof(self->sadr_area));
memcpy(in, curadr->ai_addr, curadr->ai_addrlen);
self->sadr_len = (int) curadr->ai_addrlen;
}
if (connect(self->socket, (struct sockaddr *) &(self->sadr_area), self->sadr_len) < 0)
{
int ret, optval;
int wait_sec = 0;
#ifdef HAVE_POLL
struct pollfd fds;
#else
fd_set fds, except_fds;
struct timeval tm;
#endif /* HAVE_POLL */
socklen_t optlen = sizeof(optval);
time_t t_now, t_finish = 0;
BOOL tm_exp = FALSE;
gerrno = SOCK_ERRNO;
switch (gerrno)
{
case 0:
case EINPROGRESS:
case EINTR:
#ifdef EAGAIN
case EAGAIN:
#endif /* EAGAIN */
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
#endif /* EWOULDBLOCK */
break;
default:
SOCK_set_error(self, SOCKET_COULD_NOT_CONNECT, "Could not connect to remote socket immedaitely");
goto cleanup;
}
if (timeout > 0)
{
t_now = time(NULL);
t_finish = t_now + timeout;
wait_sec = timeout;
}
do {
#ifdef HAVE_POLL
fds.fd = self->socket;
fds.events = POLLOUT;
fds.revents = 0;
ret = poll(&fds, 1, timeout > 0 ? wait_sec * 1000 : -1);
#else
tm.tv_sec = wait_sec;
tm.tv_usec = 0;
FD_ZERO(&fds);
FD_ZERO(&except_fds);
FD_SET(self->socket, &fds);
FD_SET(self->socket, &except_fds);
ret = select((int) self->socket + 1, NULL, &fds, &except_fds, timeout > 0 ? &tm : NULL);
#endif /* HAVE_POLL */
gerrno = SOCK_ERRNO;
if (0 < ret)
break;
else if (0 == ret)
tm_exp = TRUE;
else if (EINTR != gerrno)
break;
else if (timeout > 0)
{
if (t_now = time(NULL), t_now >= t_finish)
tm_exp = TRUE;
else
wait_sec = t_finish - t_now;
}
} while (!tm_exp);
if (tm_exp)
{
SOCK_set_error(self, SOCKET_COULD_NOT_CONNECT, "Could not connect .. timeout occured.");
goto cleanup;
}
else if (0 > ret)
{
SOCK_set_error(self, SOCKET_COULD_NOT_CONNECT, "Could not connect .. select error occured.");
mylog("select error ret=%d ERROR=%d\n", ret, gerrno);
goto cleanup;
}
if (getsockopt(self->socket, SOL_SOCKET, SO_ERROR,
(char *) &optval, &optlen) == -1)
{
SOCK_set_error(self, SOCKET_COULD_NOT_CONNECT, "Could not connect .. getsockopt error.");
}
else if (optval != 0)
{
char errmsg[256], host[64];
host[0] = '\0';
#if defined(_MSC_VER) && (_MSC_VER < 1300)
getnameinfo_ptr
#else
getnameinfo
#endif
((struct sockaddr *) &(self->sadr_area),
self->sadr_len, host, sizeof(host),
NULL, 0, NI_NUMERICHOST);
/* snprintf(errmsg, sizeof(errmsg), "connect getsockopt val %d addr=%s\n", optval, host); */
format_sockerr(errmsg, sizeof(errmsg), optval, "connect", host, port);
mylog(errmsg);
SOCK_set_error(self, SOCKET_COULD_NOT_CONNECT, errmsg);
}
else
retval = 1;
}
else
retval = 1;
cleanup:
if (0 == retval)
{
if (self->socket >= 0)
{
closesocket(self->socket);
self->socket = (SOCKETFD) -1;
}
if (curadr && curadr->ai_next)
{
curadr = curadr->ai_next;
goto retry;
}
}
else
SOCK_set_error(self, 0, NULL);
if (addrs)
freeaddrinfo_ptr(addrs);
return retval;
}
/*
* To handle EWOULDBLOCK etc (mainly for libpq non-blocking connection).
*/
#define MAX_RETRY_COUNT 30
static int SOCK_wait_for_ready(SocketClass *sock, BOOL output, int retry_count)
{
int ret, gerrno;
#ifdef HAVE_POLL
struct pollfd fds;
#else
fd_set fds, except_fds;
struct timeval tm;
#endif /* HAVE_POLL */
BOOL no_timeout = TRUE;
if (0 == retry_count)
no_timeout = FALSE;
else if (0 > retry_count)
no_timeout = TRUE;
#ifdef USE_SSL
else if (sock->ssl == NULL)
no_timeout = TRUE;
#endif /* USE_SSL */
do {
#ifdef HAVE_POLL
fds.fd = sock->socket;
fds.events = output ? POLLOUT : POLLIN;
fds.revents = 0;
ret = poll(&fds, 1, no_timeout ? -1 : retry_count * 1000);
mylog("!!! poll ret=%d revents=%x\n", ret, fds.revents);
#else
FD_ZERO(&fds);
FD_ZERO(&except_fds);
FD_SET(sock->socket, &fds);
FD_SET(sock->socket, &except_fds);
if (!no_timeout)
{
tm.tv_sec = retry_count;
tm.tv_usec = 0;
}
ret = select((int) sock->socket + 1, output ? NULL : &fds, output ? &fds : NULL, &except_fds, no_timeout ? NULL : &tm);
#endif /* HAVE_POLL */
gerrno = SOCK_ERRNO;
} while (ret < 0 && EINTR == gerrno);
if (retry_count < 0)
retry_count *= -1;
if (0 == ret && retry_count > MAX_RETRY_COUNT)
{
ret = -1;
SOCK_set_error(sock, output ? SOCKET_WRITE_TIMEOUT : SOCKET_READ_TIMEOUT, "SOCK_wait_for_ready timeout");
}
return ret;
}
static int SOCK_SSPI_recv(SocketClass *self, void *buffer, int len)
{
#ifdef USE_SSPI
if (self->sspisvcs && self->ssd)
return SSPI_recv(self, (char *) buffer, len);
else
#endif /* USE_SSPI */
return recv(self->socket, (char *) buffer, len, RECV_FLAG);
}
static int SOCK_SSPI_send(SocketClass *self, const void *buffer, int len)
{
#ifdef USE_SSPI
if (self->sspisvcs && self->ssd)
return SSPI_send(self, buffer, len);
else
#endif /* USE_SSPI */
return send(self->socket, (char *) buffer, len, SEND_FLAG);
}
#ifdef USE_SSL
/*
* The stuff for SSL.
*/
/* included in <openssl/ssl.h>
#define SSL_ERROR_NONE 0
#define SSL_ERROR_SSL 1
#define SSL_ERROR_WANT_READ 2
#define SSL_ERROR_WANT_WRITE 3
#define SSL_ERROR_WANT_X509_LOOKUP 4
#define SSL_ERROR_SYSCALL 5 // look at error stack/return value/errno
#define SSL_ERROR_ZERO_RETURN 6
#define SSL_ERROR_WANT_CONNECT 7
#define SSL_ERROR_WANT_ACCEPT 8
*/
/*
* recv more than 1 bytes using SSL.
*/
static int SOCK_SSL_recv(SocketClass *sock, void *buffer, int len)
{
CSTR func = "SOCK_SSL_recv";
int n, err, gerrno, retry_count = 0;
retry:
n = SSL_read(sock->ssl, buffer, len);
err = SSL_get_error(sock->ssl, len);
gerrno = SOCK_ERRNO;
inolog("%s: %d get_error=%d Lasterror=%d\n", func, n, err, gerrno);
switch (err)
{
case SSL_ERROR_NONE:
break;
case SSL_ERROR_WANT_READ:
retry_count++;
if (SOCK_wait_for_ready(sock, FALSE, retry_count) >= 0)
goto retry;
n = -1;
break;
case SSL_ERROR_WANT_WRITE:
goto retry;
break;
case SSL_ERROR_SYSCALL:
if (-1 != n)
{
n = -1;
SOCK_ERRNO_SET(ECONNRESET);
}
break;
case SSL_ERROR_SSL:
case SSL_ERROR_ZERO_RETURN:
n = -1;
SOCK_ERRNO_SET(ECONNRESET);
break;
default:
n = -1;
}
return n;
}
/*
* send more than 1 bytes using SSL.
*/
static int SOCK_SSL_send(SocketClass *sock, void *buffer, int len)
{
CSTR func = "SOCK_SSL_send";
int n, err, gerrno, retry_count = 0;
retry:
n = SSL_write(sock->ssl, buffer, len);
err = SSL_get_error(sock->ssl, len);
gerrno = SOCK_ERRNO;
inolog("%s: %d get_error=%d Lasterror=%d\n", func, n, err, gerrno);
switch (err)
{
case SSL_ERROR_NONE:
break;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
retry_count++;
if (SOCK_wait_for_ready(sock, TRUE, retry_count) >= 0)
goto retry;
n = -1;
break;
case SSL_ERROR_SYSCALL:
if (-1 != n)
{
n = -1;
SOCK_ERRNO_SET(ECONNRESET);
}
break;
case SSL_ERROR_SSL:
case SSL_ERROR_ZERO_RETURN:
n = -1;
SOCK_ERRNO_SET(ECONNRESET);
break;
default:
n = -1;
}
return n;
}
#endif /* USE_SSL */
int
SOCK_get_id(SocketClass *self)
{
int id;
if (0 != self->errornumber)
return 0;
if (self->reslen > 0)
{
mylog("SOCK_get_id has to eat %d bytes\n", self->reslen);
/*
do
{
SOCK_get_next_byte(self, FALSE);
if (0 != self->errornumber)
return 0;
} while (self->reslen > 0);
*/
SOCK_get_next_n_bytes(self, self->reslen, NULL);
}
id = SOCK_get_next_byte(self, FALSE);
self->reslen = 0;
return id;
}
void
SOCK_get_n_char(SocketClass *self, char *buffer, Int4 len)
{
if (!self)
return;
if (!buffer)
{
SOCK_set_error(self, SOCKET_NULLPOINTER_PARAMETER, "get_n_char was called with NULL-Pointer");
return;
}
/*
for (lf = 0; lf < len; lf++)
{
if (0 != self->errornumber)
break;
buffer[lf] = SOCK_get_next_byte(self, FALSE);
}
*/
SOCK_get_next_n_bytes(self, len, buffer);
}
void
SOCK_put_n_char(SocketClass *self, const char *buffer, Int4 len)
{
int lf;
if (!self)
return;
if (!buffer)
{
SOCK_set_error(self, SOCKET_NULLPOINTER_PARAMETER, "put_n_char was called with NULL-Pointer");
return;
}
for (lf = 0; lf < len; lf++)
{
if (0 != self->errornumber)
break;
SOCK_put_next_byte(self, (UCHAR) buffer[lf]);
}
}
/*
* bufsize must include room for the null terminator
* will read at most bufsize-1 characters + null.
* returns TRUE if truncation occurs.
*/
BOOL
SOCK_get_string(SocketClass *self, char *buffer, Int4 bufsize)
{
int lf;
for (lf = 0; lf < bufsize - 1; lf++)
if (!(buffer[lf] = SOCK_get_next_byte(self, FALSE)))
return FALSE;
buffer[bufsize - 1] = '\0';
return TRUE;
}
void
SOCK_put_string(SocketClass *self, const char *string)
{
size_t lf, len;
len = strlen(string) + 1;
for (lf = 0; lf < len; lf++)
{
if (0 != self->errornumber)
break;
SOCK_put_next_byte(self, (UCHAR) string[lf]);
}
}
#define REVERSE_SHORT(val) ((val & 0xff) << 8) | (val >> 8)
#define REVERSE_INT(val) ((val & 0xff) << 24) | ((val & 0xff00) << 8) | ((val & 0xff0000) >> 8) | (val >> 24)
int
SOCK_get_int(SocketClass *self, short len)
{
if (!self)
return 0;
switch (len)
{
case 2:
{
unsigned short buf;
SOCK_get_n_char(self, (char *) &buf, len);
if (self->reverse)
return REVERSE_SHORT(ntohs(buf));
else
return ntohs(buf);
}
case 4:
{
unsigned int buf;
SOCK_get_n_char(self, (char *) &buf, len);
if (self->reverse)
return REVERSE_INT(htonl(buf));
else
return ntohl(buf);
}
default:
SOCK_set_error(self, SOCKET_GET_INT_WRONG_LENGTH, "Cannot read ints of that length");
return 0;
}
}
void
SOCK_put_int(SocketClass *self, int value, short len)
{
unsigned int rv;
unsigned short rsv;
if (!self)
return;
switch (len)
{
case 2:
rsv = htons((unsigned short) value);
if (self->reverse)
rsv = REVERSE_SHORT(rsv);
SOCK_put_n_char(self, (char *) &rsv, 2);
return;
case 4:
rv = htonl((unsigned int) value);
if (self->reverse)
rv = REVERSE_INT(rv);
SOCK_put_n_char(self, (char *) &rv, 4);
return;
default:
SOCK_set_error(self, SOCKET_PUT_INT_WRONG_LENGTH, "Cannot write ints of that length");
return;
}
}
Int4
SOCK_flush_output(SocketClass *self)
{
int written, pos = 0, retry_count = 0, ttlsnd = 0, gerrno;
if (!self)
return -1;
if (0 != self->errornumber)
return -1;
while (self->buffer_filled_out > 0)
{
#ifdef USE_SSL
if (self->ssl)
written = SOCK_SSL_send(self, (char *) self->buffer_out + pos, self->buffer_filled_out);
else
#endif /* USE_SSL */
{
written = SOCK_SSPI_send(self, (char *) self->buffer_out + pos, self->buffer_filled_out);
}
gerrno = SOCK_ERRNO;
if (written < 0)
{
switch (gerrno)
{
case EINTR:
continue;
break;
#ifdef EAGAIN
case EAGAIN:
#endif /* EAGAIN */
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
#endif /* EWOULDBLOCK */
retry_count++;
if (SOCK_wait_for_ready(self, TRUE, retry_count) >= 0)
continue;
break;
}
SOCK_set_error(self, SOCKET_WRITE_ERROR, "Could not flush socket buffer.");
return -1;
}
pos += written;
self->buffer_filled_out -= written;
ttlsnd += written;
retry_count = 0;
}
return ttlsnd;
}
UCHAR
SOCK_get_next_byte(SocketClass *self, BOOL peek)
{
int retry_count = 0, gerrno;
BOOL maybeEOF = FALSE;
if (!self)
return 0;
if (self->buffer_read_in >= self->buffer_filled_in)
{
/*
* there are no more bytes left in the buffer so reload the buffer
*/
self->buffer_read_in = 0;
retry:
#ifdef USE_SSL
if (self->ssl)
self->buffer_filled_in = SOCK_SSL_recv(self, (char *) self->buffer_in, self->buffer_size);
else
#endif /* USE_SSL */
self->buffer_filled_in = SOCK_SSPI_recv(self, (char *) self->buffer_in, self->buffer_size);
gerrno = SOCK_ERRNO;
mylog("read %d, global_socket_buffersize=%d\n", self->buffer_filled_in, self->buffer_size);
if (self->buffer_filled_in < 0)
{
mylog("Lasterror=%d\n", gerrno);
switch (gerrno)
{
case EINTR:
goto retry;
break;
#ifdef EAGAIN
case EAGAIN:
#endif /* EAGAIN */
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
#endif /* EWOULDBLOCK */
retry_count++;
if (SOCK_wait_for_ready(self, FALSE, retry_count) >= 0)
goto retry;
break;
case ECONNRESET:
inolog("ECONNRESET\n");
maybeEOF = TRUE;
SOCK_set_error(self, SOCKET_CLOSED, "Connection reset by peer.");
break;
}
if (0 == self->errornumber)
SOCK_set_error(self, SOCKET_READ_ERROR, "Error while reading from the socket.");
self->buffer_filled_in = 0;
return 0;
}
if (self->buffer_filled_in == 0)
{
if (!maybeEOF)
{
int nready = SOCK_wait_for_ready(self, FALSE, 0);
if (nready > 0)
{
maybeEOF = TRUE;
goto retry;
}
else if (0 == nready)
maybeEOF = TRUE;
}
if (maybeEOF)
SOCK_set_error(self, SOCKET_CLOSED, "Socket has been closed.");
else
SOCK_set_error(self, SOCKET_READ_ERROR, "Error while reading from the socket.");
return 0;
}
}
if (peek)
return self->buffer_in[self->buffer_read_in];
if (PG_PROTOCOL_74 == self->pversion)
self->reslen--;
return self->buffer_in[self->buffer_read_in++];
}
static int
SOCK_get_next_n_bytes(SocketClass *self, int n, char *buf)
{
int retry_count = 0, gerrno, rest, rlen;
BOOL maybeEOF = FALSE;
if (!self || !n)
return 0;
for (rest = n; 0 < rest;)
{
if (self->buffer_read_in >= self->buffer_filled_in)
{
/*
* there are no more bytes left in the buffer so reload the buffer
*/
self->buffer_read_in = 0;
retry:
#ifdef USE_SSL
if (self->ssl)
self->buffer_filled_in = SOCK_SSL_recv(self, (char *) self->buffer_in, self->buffer_size);
else
#endif /* USE_SSL */
self->buffer_filled_in = SOCK_SSPI_recv(self, (char *) self->buffer_in, self->buffer_size);
gerrno = SOCK_ERRNO;
mylog("read %d, global_socket_buffersize=%d\n", self->buffer_filled_in, self->buffer_size);
if (self->buffer_filled_in < 0)
{
mylog("Lasterror=%d\n", gerrno);
switch (gerrno)