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snet.c
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snet.c
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/*
* Copyright (c) Regents of The University of Michigan
* See COPYING.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <inttypes.h>
#include <syslog.h>
#include <netinet/in.h>
#ifdef __STDC__
#include <stdarg.h>
#else /* __STDC__ */
#include <varargs.h>
#endif /* __STDC__ */
#include "snet.h"
#define SNET_BUFLEN 4096
/*
* BOL is beginning of line, FUZZY is after a CR but before a possible LF,
* IN is past BOL, but before the end of a line.
*/
#define SNET_BOL 0
#define SNET_FUZZY 1
#define SNET_IN 2
static ssize_t snet_read0 ___P(( SNET *, char *, size_t, struct timeval * ));
static ssize_t snet_read1 ___P(( SNET *, char *, size_t, struct timeval * ));
static ssize_t snet_write0 ___P(( SNET *, char *, size_t, struct timeval * ));
/*
* This routine is necessary, since snet_getline() doesn't differentiate
* between NULL => EOF and NULL => connection dropped (or some other error).
*/
int
snet_eof( SNET *sn )
{
return ( sn->sn_flag & SNET_EOF );
}
SNET *
snet_attach( fd, max )
int fd;
size_t max;
{
SNET *sn;
if (( sn = malloc( sizeof( SNET ))) == NULL ) {
return( NULL );
}
sn->sn_fd = fd;
if (( sn->sn_rbuf = malloc( SNET_BUFLEN )) == NULL ) {
free( sn );
return( NULL );
}
sn->sn_rbuflen = SNET_BUFLEN;
sn->sn_rstate = SNET_BOL;
sn->sn_rcur = sn->sn_rend = sn->sn_rbuf;
sn->sn_maxlen = max;
if (( sn->sn_wbuf = malloc( SNET_BUFLEN )) == NULL ) {
free( sn->sn_rbuf );
free( sn );
return( NULL );
}
sn->sn_wbuflen = SNET_BUFLEN;
sn->sn_flag = 0;
return( sn );
}
SNET *
snet_open( path, flags, mode, max )
const char *path;
int flags;
int mode;
size_t max;
{
int fd;
if (( fd = open( path, flags, mode )) < 0 ) {
return( NULL );
}
return( snet_attach( fd, max ));
}
int
snet_close( SNET *sn )
{
int fd;
fd = snet_fd( sn );
free( sn->sn_wbuf );
free( sn->sn_rbuf );
free( sn );
if ( close( fd ) < 0 ) {
return( -1 );
}
return( 0 );
}
void
snet_timeout( SNET *sn, int flag, struct timeval *tv )
{
if ( flag & SNET_READ_TIMEOUT ) {
sn->sn_flag |= SNET_READ_TIMEOUT;
memcpy( &(sn->sn_read_timeout), tv, sizeof( struct timeval ));
}
if ( flag & SNET_WRITE_TIMEOUT ) {
sn->sn_flag |= SNET_WRITE_TIMEOUT;
memcpy( &(sn->sn_write_timeout), tv, sizeof( struct timeval ));
}
if ( flag & SNET_SSL_ACCEPT_TIMEOUT ) {
sn->sn_flag |= SNET_SSL_ACCEPT_TIMEOUT;
memcpy( &(sn->sn_ssl_accept_timeout), tv, sizeof( struct timeval ));
}
if ( flag & SNET_SSL_CONNECT_TIMEOUT ) {
sn->sn_flag |= SNET_SSL_CONNECT_TIMEOUT;
memcpy( &(sn->sn_ssl_connect_timeout), tv, sizeof( struct timeval ));
}
return;
}
#ifdef SNET_HAVE_LIBSSL
/*
* Returns 0 on success, and all further communication is through
* the OpenSSL layer. Returns -1 on failure, check the OpenSSL error
* stack for specific errors.
*/
int
snet_starttls( SNET *sn, SSL_CTX *sslctx, int sslaccept )
{
struct timeval default_tv;
if (( sslaccept != 0 ) && ( sn->sn_flag & SNET_SSL_ACCEPT_TIMEOUT )) {
default_tv = sn->sn_ssl_accept_timeout;
return( snet_starttls_tv( sn, sslctx, sslaccept, &default_tv ));
} else if (( sslaccept == 0 ) &&
( sn->sn_flag & SNET_SSL_CONNECT_TIMEOUT )) {
default_tv = sn->sn_ssl_connect_timeout;
return( snet_starttls_tv( sn, sslctx, sslaccept, &default_tv ));
} else {
return( snet_starttls_tv( sn, sslctx, sslaccept, NULL ));
}
}
int
snet_starttls_tv( SNET *sn, SSL_CTX *sslctx, int sslaccept, struct timeval *tv )
{
int rc;
int oflags = 0;
if (( sn->sn_ssl = SSL_new( sslctx )) == NULL ) {
return( -1 );
}
if (( rc = SSL_set_fd( sn->sn_ssl, snet_fd( sn ))) != 1 ) {
return( rc );
}
if ( tv != NULL ) {
if (( oflags = fcntl( snet_fd( sn ), F_GETFL )) < 0 ) {
return( -1 );
}
if (( oflags & O_NONBLOCK ) == 0 ) {
if ( fcntl( snet_fd( sn ), F_SETFL, oflags | O_NONBLOCK ) < 0 ) {
return( -1 );
}
}
}
for ( ; ; ) {
int err;
fd_set fd_read;
fd_set fd_write;
if ( sslaccept ) {
rc = SSL_accept( sn->sn_ssl );
} else {
rc = SSL_connect( sn->sn_ssl );
}
if ( rc == 1 ) {
sn->sn_flag |= SNET_TLS;
break;
}
if ( rc == 0 ) {
break;
}
if ( tv == NULL ) {
break;
}
if ( tv->tv_sec == 0 && tv->tv_usec == 0 ) {
break;
}
err = SSL_get_error( sn->sn_ssl, rc );
if ( err == SSL_ERROR_WANT_READ ) {
FD_ZERO( &fd_read );
FD_ZERO( &fd_write );
FD_SET( snet_fd( sn ), &fd_read );
} else if ( err == SSL_ERROR_WANT_WRITE ) {
FD_ZERO( &fd_read );
FD_ZERO( &fd_write );
FD_SET( snet_fd( sn ), &fd_write );
} else {
break;
}
if ( snet_select( snet_fd( sn ) + 1, &fd_read, &fd_write, NULL,
tv ) < 0 ) {
break;
}
}
if (( tv != NULL ) && (( oflags & O_NONBLOCK ) == 0 )) {
if ( fcntl( snet_fd( sn ), F_SETFL, oflags ) < 0 ) {
return( -1 );
}
}
return( rc );
}
#endif /* SNET_HAVE_LIBSSL */
#ifdef SNET_HAVE_LIBSASL
int
snet_setsasl( sn, conn )
SNET *sn;
sasl_conn_t *conn;
{
const int *ssfp;
unsigned int *maxp;
int rc;
/* XXX - flush cache */
/* security layer security strength factor. If 0, call to sasl_encode,
* sasl_decode unnecessary
*/
if (( rc = sasl_getprop( conn, SASL_SSF, (const void **) &ssfp))
!= SASL_OK ) {
return( -1 );
}
sn->sn_saslssf = *ssfp;
/* security layer max output buf unsigned */
if (( rc = sasl_getprop( conn, SASL_MAXOUTBUF, (const void **) &maxp))
!= SASL_OK ) {
return( -1 );
}
sn->sn_saslmaxout = *maxp;
sn->sn_saslconn = conn;
sn->sn_flag |= SNET_SASL;
return( 0 );
}
#endif /* SNET_HAVE_LIBSASL */
/*
* Just like fprintf, only use the SNET header to get the fd, and use
* snet_write() to move the data.
*
* Todo: %f, *, . and, -
*/
ssize_t
#ifdef __STDC__
snet_writeftv( SNET *sn, struct timeval *tv, const char *format, ... )
#else /* __STDC__ */
snet_writeftv( sn, tv, format, va_alist )
SNET *sn;
struct timeval *tv;
const char *format;
va_dcl
#endif /* __STDC__ */
{
va_list vl;
char dbuf[ 128 ], *p;
char *dbufoff;
int d;
size_t len;
long l;
long long ll;
unsigned int u_d;
unsigned long u_l;
unsigned long long u_ll;
int is_long, is_longlong, is_unsigned, is_negative;
char *cur, *end;
#ifdef __STDC__
va_start( vl, format );
#else /* __STDC__ */
va_start( vl );
#endif /* __STDC__ */
#define SNET_WBUFGROW(x) \
while ( cur + (x) > end ) { \
if (( sn->sn_wbuf = realloc( sn->sn_wbuf, \
sn->sn_wbuflen + SNET_BUFLEN )) == NULL ) { \
abort(); \
} \
cur = sn->sn_wbuf + sn->sn_wbuflen - ( end - cur ); \
sn->sn_wbuflen += SNET_BUFLEN; \
end = sn->sn_wbuf + sn->sn_wbuflen; \
}
cur = sn->sn_wbuf;
end = sn->sn_wbuf + sn->sn_wbuflen;
for ( ; *format; format++ ) {
if ( *format != '%' ) {
SNET_WBUFGROW( 1 );
*cur++ = *format;
} else {
is_long = 0;
is_longlong = 0;
is_unsigned = 0;
modifier:
switch ( *++format ) {
case 's' :
p = va_arg( vl, char * );
len = strlen( p );
SNET_WBUFGROW( len );
memcpy( cur, p, len );
cur += len;
break;
case 'c' :
SNET_WBUFGROW( 1 );
*cur++ = (char)va_arg( vl, int );
break;
case 'l' :
if ( is_long ) {
is_longlong = 1;
} else {
is_long = 1;
}
goto modifier;
case 'u' :
is_unsigned = 1;
goto modifier;
case 'd' :
p = dbufoff = dbuf + sizeof( dbuf );
#define SNET_WF_D(x) \
if ( (x) < 0 ) { \
is_negative = 1; \
(x) = - (x); \
} else { \
is_negative = 0; \
} \
do { \
if ( --dbufoff < dbuf ) { \
abort(); \
} \
*dbufoff = '0' + ( (x) % 10 ); \
(x) /= 10; \
} while ( (x) ); \
if ( !is_unsigned && is_negative ) { \
if ( --dbufoff < dbuf ) { \
abort(); \
} \
*dbufoff = '-'; \
}
if ( is_unsigned ) {
if ( is_longlong ) {
u_ll = va_arg( vl, unsigned long long );
SNET_WF_D( u_ll );
} else if ( is_long ) {
u_l = va_arg( vl, unsigned long );
SNET_WF_D( u_l );
} else {
u_d = va_arg( vl, unsigned int );
SNET_WF_D( u_d );
}
} else {
if ( is_longlong ) {
ll = va_arg( vl, long long );
SNET_WF_D( ll );
} else if ( is_long ) {
l = va_arg( vl, long );
SNET_WF_D( l );
} else {
d = va_arg( vl, int );
SNET_WF_D( d );
}
}
len = (size_t)( p - dbufoff );
SNET_WBUFGROW( len );
memcpy( cur, dbufoff, len );
cur += len;
break;
case 'o' :
p = dbufoff = dbuf + sizeof( dbuf );
#define SNET_WF_O(x) \
do { \
if ( --dbufoff < dbuf ) { \
abort(); \
} \
*dbufoff = '0' + ( (x) & 0007 ); \
(x) = (x) >> 3; \
} while ( (x) );
if ( is_longlong ) {
u_ll = va_arg( vl, unsigned long long );
SNET_WF_O( u_ll );
} else if ( is_long ) {
u_l = va_arg( vl, unsigned long );
SNET_WF_O( u_l );
} else {
u_d = va_arg( vl, unsigned int );
SNET_WF_O( u_d );
}
len = (size_t)( p - dbufoff );
SNET_WBUFGROW( len );
memcpy( cur, dbufoff, len );
cur += len;
break;
case 'x' :
p = dbufoff = dbuf + sizeof( dbuf );
#define SNET_WF_X(x) \
do { \
char hexalpha[] = "0123456789abcdef";\
if ( --dbufoff < dbuf ) { \
abort(); \
} \
*dbufoff = hexalpha[ (x) & 0x0f ]; \
(x) = (x) >> 4; \
} while ( (x) );
if ( is_longlong ) {
u_ll = va_arg( vl, unsigned long long );
SNET_WF_X( u_ll );
} else if ( is_long ) {
u_l = va_arg( vl, unsigned long );
SNET_WF_X( u_l );
} else {
u_d = va_arg( vl, unsigned int );
SNET_WF_X( u_d );
}
len = (size_t)( p - dbufoff );
SNET_WBUFGROW( len );
memcpy( cur, dbufoff, len );
cur += len;
break;
case 'X' :
p = dbufoff = dbuf + sizeof( dbuf );
#define SNET_WF_XX(x) \
do { \
char hexalpha[] = "0123456789ABCDEF";\
if ( --dbufoff < dbuf ) { \
abort(); \
} \
*dbufoff = hexalpha[ (x) & 0x0f ]; \
(x) = (x) >> 4; \
} while ( (x) );
if ( is_longlong ) {
u_ll = va_arg( vl, unsigned long long );
SNET_WF_XX( u_ll );
} else if ( is_long ) {
u_l = va_arg( vl, unsigned long );
SNET_WF_XX( u_l );
} else {
u_d = va_arg( vl, unsigned int );
SNET_WF_XX( u_d );
}
len = (size_t)( p - dbufoff );
SNET_WBUFGROW( len );
memcpy( cur, dbufoff, len );
cur += len;
break;
default :
SNET_WBUFGROW( 2 );
*cur++ = '%';
*cur++ = 'E';
break;
}
}
}
va_end( vl );
return( snet_write( sn, sn->sn_wbuf, (size_t)( cur - sn->sn_wbuf ), tv ));
}
/*
* select that updates the timeout structure.
*
* We could define snet_select to just be select on platforms that update
* the timeout structure.
*/
int
snet_select( int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds,
struct timeval *tv )
{
#ifndef linux
#if _POSIX_TIMERS > 0
struct timespec tv_begin, tv_end;
#ifdef CLOCK_MONOTONIC_COARSE
clockid_t clock = CLOCK_MONOTONIC_COARSE;
#elif defined(CLOCK_MONOTONIC_FAST)
clockid_t clock = CLOCK_MONOTONIC_FAST;
#elif _POSIX_MONOTONIC_CLOCK > 0
clockid_t clock = CLOCK_MONOTONIC;
#else
clockid_t clock = CLOCK_REALTIME;
#endif /* CLOCK_MONOTONIC_COARSE */
#else /* _POSIX_TIMERS */
struct timeval tv_begin, tv_end;
#endif /* _POSIX_TIMERS */
#endif /* linux */
int rc;
#ifndef linux
#if _POSIX_TIMERS > 0
if ( clock_gettime( clock, &tv_begin ) < 0 ) {
#else
if ( gettimeofday( &tv_begin, NULL ) < 0 ) {
#endif /* _POSIX_TIMERS */
return( -1 );
}
#endif /* linux */
rc = select( nfds, rfds, wfds, efds, tv );
#ifndef linux
#if _POSIX_TIMERS > 0
if ( clock_gettime( clock, &tv_end ) < 0 ) {
#else
if ( gettimeofday( &tv_end, NULL ) < 0 ) {
#endif /* _POSIX_TIMERS */
return( -1 );
}
#if _POSIX_TIMERS > 0
if ( tv_begin.tv_nsec > tv_end.tv_nsec ) {
tv_end.tv_nsec += 1000000000;
tv_end.tv_sec -= 1;
}
if (( tv->tv_usec -= (( tv_end.tv_nsec - tv_begin.tv_nsec ) / 1000 )) < 0 ) {
#else
if ( tv_begin.tv_usec > tv_end.tv_usec ) {
tv_end.tv_usec += 1000000;
tv_end.tv_sec -= 1;
}
if (( tv->tv_usec -= ( tv_end.tv_usec - tv_begin.tv_usec )) < 0 ) {
#endif
tv->tv_usec += 1000000;
tv->tv_sec -= 1;
}
/*
* If we've gone negative, we don't generate an additional error. Instead,
* we just zero tv and return whatever select() returned. The caller
* must inspect the fd_sets to determine that nothing was set.
*/
if (( tv->tv_sec -= ( tv_end.tv_sec - tv_begin.tv_sec )) < 0 ) {
tv->tv_sec = 0;
tv->tv_usec = 0;
}
#endif /* linux */
return( rc );
}
static ssize_t
snet_write0( sn, buf, len, tv )
SNET *sn;
char *buf;
size_t len;
struct timeval *tv;
{
fd_set fds;
ssize_t rc;
int oflags;
ssize_t rlen = 0;
struct timeval default_tv;
#ifdef SNET_HAVE_LIBSASL
if (( sn->sn_flag & SNET_SASL ) && ( sn->sn_saslssf )) {
const char *ebuf;
unsigned elen;
/* Encode if SASL needs it */
if (( sasl_encode( sn->sn_saslconn, buf, len,
&ebuf, &elen )) != SASL_OK ) {
return( -1 );
}
buf = (char*)ebuf;
len = elen;
}
#endif /* SNET_HAVE_LIBSASL */
if (( tv == NULL ) && ( sn->sn_flag & SNET_WRITE_TIMEOUT )) {
default_tv = sn->sn_write_timeout;
tv = &default_tv;
}
if ( tv == NULL ) {
if ( sn->sn_flag & SNET_TLS ) {
#ifdef SNET_HAVE_LIBSSL
/*
* If SSL_MODE_ENABLE_PARTIAL_WRITE has been set, this routine
* can (abnormally) return less than a full write.
*/
return( SSL_write( sn->sn_ssl, buf, len ));
#else
return( -1 );
#endif /* SNET_HAVE_LIBSSL */
} else {
return( write( snet_fd( sn ), buf, len ));
}
}
if (( oflags = fcntl( snet_fd( sn ), F_GETFL )) < 0 ) {
return( -1 );
}
if (( oflags & O_NONBLOCK ) == 0 ) {
if ( fcntl( snet_fd( sn ), F_SETFL, oflags | O_NONBLOCK ) < 0 ) {
return( -1 );
}
}
while ( len > 0 ) {
FD_ZERO( &fds );
FD_SET( snet_fd( sn ), &fds );
if ( snet_select( snet_fd( sn ) + 1, NULL, &fds, NULL, tv ) < 0 ) {
goto restoreblocking;
}
if ( FD_ISSET( snet_fd( sn ), &fds ) == 0 ) {
errno = ETIMEDOUT;
goto restoreblocking;
}
if ( sn->sn_flag & SNET_TLS ) {
#ifdef SNET_HAVE_LIBSSL
/*
* Make sure we ARE allowing partial writes. This can't
* be turned off!!!
*/
SSL_set_mode( sn->sn_ssl, SSL_MODE_ENABLE_PARTIAL_WRITE );
if (( rc = SSL_write( sn->sn_ssl, buf, len )) <= 0 ) {
switch ( SSL_get_error( sn->sn_ssl, rc )) {
case SSL_ERROR_WANT_READ :
FD_ZERO( &fds );
FD_SET( snet_fd( sn ), &fds );
if ( snet_select( snet_fd( sn ) + 1,
&fds, NULL, NULL, tv ) < 0 ) {
goto restoreblocking;
}
if ( FD_ISSET( snet_fd( sn ), &fds ) == 0 ) {
errno = ETIMEDOUT;
goto restoreblocking;
}
case SSL_ERROR_WANT_WRITE :
continue;
default :
goto restoreblocking;
}
}
#else
goto restoreblocking;
#endif /* SNET_HAVE_LIBSSL */
} else {
if (( rc = write( snet_fd( sn ), buf, len )) < 0 ) {
if ( errno == EAGAIN ) {
continue;
}
goto restoreblocking;
}
}
buf += rc;
rlen += rc;
len -= rc;
}
if (( oflags & O_NONBLOCK ) == 0 ) {
if ( fcntl( snet_fd( sn ), F_SETFL, oflags ) < 0 ) {
return( -1 );
}
}
return( rlen );
restoreblocking:
if (( oflags & O_NONBLOCK ) == 0 ) {
if ( fcntl( snet_fd( sn ), F_SETFL, oflags ) < 0 ) {
return( -1 );
}
}
return( -1 );
}
/* Start compression on the link. "opt" allows option parameters to be set
* for the compression chosen by "type".
*
* Returns -1 for error, 0 in other cases
*/
int
snet_setcompression( sn, type, level )
SNET *sn;
int type;
int level;
{
#ifdef SNET_HAVE_ZLIB
int len = 0;
if ( sn->sn_flag & SNET_ZLIB ) {
return( -1 );
}
if ( type != SNET_ZLIB ) {
return( -1 );
}
memset( &sn->sn_zistream, 0, sizeof( sn->sn_zistream ));
if ( inflateInit( &sn->sn_zistream ) != Z_OK ) {
return( -1 );
}
memset( &sn->sn_zostream, 0, sizeof( sn->sn_zostream ));
if ( deflateInit( &sn->sn_zostream, level ) != Z_OK ) {
return( -1 );
}
if ( snet_hasdata( sn )) {
len = sn->sn_rend - sn->sn_rcur;
}
#ifndef max
#define max(a,b) (((a)<(b))?(b):(a))
#endif /* max */
sn->sn_zbuflen = max( SNET_BUFLEN, len );
if (( sn->sn_zbuf = malloc( sn->sn_zbuflen )) == NULL ) {
return( -1 );
}
sn->sn_zistream.next_in = (unsigned char *)sn->sn_zbuf;
if ( len ) {
memcpy( sn->sn_zbuf, sn->sn_rcur, len );
sn->sn_zistream.avail_in = len;
sn->sn_rcur = sn->sn_rend = sn->sn_rbuf;
} else {
sn->sn_zistream.avail_in = 0;
}
sn->sn_flag |= type;
return( 0 );
#else /* SNET_HAVE_ZLIB */
return( -1 );
#endif /* SNET_HAVE_ZLIB */
}
static ssize_t
snet_read0( sn, buf, len, tv )
SNET *sn;
char *buf;
size_t len;
struct timeval *tv;
{
#ifdef SNET_HAVE_ZLIB
ssize_t rr;
#endif /* SNET_HAVE_ZLIB */
if (( sn->sn_flag & SNET_ZLIB ) == 0 ) {
return snet_read1( sn, buf, len, tv );
}
#ifdef SNET_HAVE_ZLIB
sn->sn_zistream.avail_out = len;
sn->sn_zistream.next_out = (unsigned char *)buf;
do {
if ( sn->sn_zistream.avail_in == 0 ) {
if (( rr = snet_read1( sn, sn->sn_zbuf, sn->sn_zbuflen, tv )) < 0) {
return( -1 );
}
if ( rr == 0 ) {
break; /* EOF */
}
sn->sn_zistream.avail_in = rr;
sn->sn_zistream.next_in = (unsigned char *)sn->sn_zbuf;
}
if ( inflate( &sn->sn_zistream, Z_SYNC_FLUSH ) != Z_OK ) {
return( -1 );
}
} while ( sn->sn_zistream.avail_out == len );
return( len - sn->sn_zistream.avail_out );
#else /* SNET_HAVE_ZLIB */
return( -1 );
#endif /* SNET_HAVE_ZLIB */
}
ssize_t
snet_write( sn, buf, len, tv )
SNET *sn;
char *buf;
size_t len;
struct timeval *tv;
{
#ifdef SNET_HAVE_ZLIB
char cobuf[ 8192 ];
size_t zlen;
#endif /* SNET_HAVE_ZLIB */
if (( sn->sn_flag & SNET_ZLIB ) == 0 ) {
return snet_write0( sn, buf, len, tv );
}
#ifdef SNET_HAVE_ZLIB
/* XXX What if len == 0 ? */
sn->sn_zostream.avail_in = len;
sn->sn_zostream.next_in = (unsigned char *)buf;
/* Continue until buf is at end */
do {
sn->sn_zostream.avail_out = sizeof( cobuf );
sn->sn_zostream.next_out = (unsigned char *)cobuf;
if ( deflate( &sn->sn_zostream, Z_SYNC_FLUSH ) != Z_OK ) {
/* ZZZ */
return( -1 );
}
zlen = sizeof( cobuf ) - sn->sn_zostream.avail_out;
if ( zlen > 0 ) {
if ( snet_write0( sn, cobuf, zlen, tv ) != zlen ) {
/* ZZZ */
return( -1 );
}
}
} while ( sn->sn_zostream.avail_in > 0 || sn->sn_zostream.avail_out == 0 );
return( len );
#else /* SNET_HAVE_ZLIB */
return( -1 );
#endif /* SNET_HAVE_ZLIB */
}
static ssize_t
snet_read1( sn, buf, len, tv )
SNET *sn;
char *buf;
size_t len;
struct timeval *tv;
{
fd_set fds;
ssize_t rc;
struct timeval default_tv;
extern int errno;
int oflags = 0, dontblock = 0;
if (( tv == NULL ) && ( sn->sn_flag & SNET_READ_TIMEOUT )) {
default_tv = sn->sn_read_timeout;
tv = &default_tv;
}
if ( tv ) {
dontblock = 1;
#ifdef SNET_HAVE_LIBSSL
/* Check to see if there is already data in SSL buffer */
if ( sn->sn_flag & SNET_TLS ) {
dontblock = ! SSL_pending( sn->sn_ssl );
}
#endif /* SNET_HAVE_LIBSSL */
}
if ( dontblock ) {
if (( oflags = fcntl( snet_fd( sn ), F_GETFL )) < 0 ) {
return( -1 );
}
if (( oflags & O_NONBLOCK ) == 0 ) {
if (( fcntl( snet_fd( sn ), F_SETFL, oflags | O_NONBLOCK )) < 0 ) {
return( -1 );
}
}
retry:
FD_ZERO( &fds );
FD_SET( snet_fd( sn ), &fds );
/* time out case? */
if ( select( snet_fd( sn ) + 1, &fds, NULL, NULL, tv ) < 0 ) {
goto restoreblocking;
}
if ( FD_ISSET( snet_fd( sn ), &fds ) == 0 ) {
errno = ETIMEDOUT;
goto restoreblocking;
}
}
if ( sn->sn_flag & SNET_TLS ) {
#ifdef SNET_HAVE_LIBSSL
if (( rc = SSL_read( sn->sn_ssl, buf, len )) < 0 ) {
switch ( SSL_get_error( sn->sn_ssl, rc )) {
case SSL_ERROR_WANT_WRITE :
FD_ZERO( &fds );
FD_SET( snet_fd( sn ), &fds );
if ( snet_select( snet_fd( sn ) + 1,
NULL, &fds, NULL, tv ) < 0 ) {
goto restoreblocking;
}
if ( FD_ISSET( snet_fd( sn ), &fds ) == 0 ) {
errno = ETIMEDOUT;
goto restoreblocking;
}
case SSL_ERROR_WANT_READ :
goto retry;
default :
goto restoreblocking;
}
}
#else /* SNET_HAVE_LIBSSL */
rc = -1;
#endif /* SNET_HAVE_LIBSSL */
} else {
rc = read( snet_fd( sn ), buf, len );
}
if ( rc == 0 ) {
sn->sn_flag |= SNET_EOF;
}
if ( dontblock && (( oflags & O_NONBLOCK ) == 0 )) {
if (( fcntl( snet_fd( sn ), F_SETFL, oflags )) < 0 ) {
return( -1 );
}
}
#ifdef SNET_HAVE_LIBSASL
if (( sn->sn_flag & SNET_SASL ) && ( sn->sn_saslssf )) {
/* Decode via SASL */
const char *dbuf;
unsigned dbuf_len;
if ( sasl_decode( sn->sn_saslconn, buf, rc, &dbuf, &dbuf_len )
!= SASL_OK ) {
return( -1 );
}
if ( dbuf_len > len ) {
/* XXX - resize buf */
}
memcpy( buf, dbuf, dbuf_len );
rc = dbuf_len;
}
#endif /* SNET_HAVE_LIBSASL */