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upstream: add a -X option to both scp(1) and sftp(1) to allow 

control over some SFTP protocol knobs: the copy buffer length and
the number of inflight requests, both of which are used during
upload/download.

Previously these could be controlled in sftp(1) using the -b/-R options.
This makes them available in both SFTP protocol clients using the same
option character sequence.

ok dtucker@

OpenBSD-Commit-ID: 27502bffc589776f5da1f31df8cb51abe9a15f1c
This commit is contained in:
djm@openbsd.org 2022-12-16 03:40:03 +00:00 committed by Darren Tucker
parent 5a7a7acab2
commit e555d5cad5
No known key found for this signature in database
5 changed files with 101 additions and 14 deletions
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18
scp.1
View File

@ -8,9 +8,9 @@
.\"
.\" Created: Sun May 7 00:14:37 1995 ylo
.\"
.\" $OpenBSD: scp.1,v 1.110 2022/09/19 21:39:16 djm Exp $
.\" $OpenBSD: scp.1,v 1.111 2022/12/16 03:40:03 djm Exp $
.\"
.Dd $Mdocdate: September 19 2022 $
.Dd $Mdocdate: December 16 2022 $
.Dt SCP 1
.Os
.Sh NAME
@ -28,6 +28,7 @@
.Op Fl o Ar ssh_option
.Op Fl P Ar port
.Op Fl S Ar program
.Op Fl X Ar sftp_option
.Ar source ... target
.Sh DESCRIPTION
.Nm
@ -278,6 +279,19 @@ and
to print debugging messages about their progress.
This is helpful in
debugging connection, authentication, and configuration problems.
.It Fl X Ar sftp_option
Specify an option that controls aspects of SFTP protocol behaviour.
The valid options are:
.Bl -tag -width Ds
.It Cm nrequests Ns = Ns Ar value
Controls how many concurrent SFTP read or write requests may be in progress
at any point in time during a download or upload.
By default 64 requests may be active concurrently.
.It Cm buffer Ns = Ns Ar value
Controls the maximum buffer size for a single SFTP read/write operation used
during download or upload.
By default a 32KB buffer is used.
.El
.El
.Sh EXIT STATUS
.Ex -std scp

42
scp.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: scp.c,v 1.249 2022/10/24 21:51:55 djm Exp $ */
/* $OpenBSD: scp.c,v 1.250 2022/12/16 03:40:03 djm Exp $ */
/*
* scp - secure remote copy. This is basically patched BSD rcp which
* uses ssh to do the data transfer (instead of using rcmd).
@ -106,6 +106,9 @@
#include <libgen.h>
#endif
#include <limits.h>
#ifdef HAVE_UTIL_H
# include <util.h>
#endif
#include <locale.h>
#include <pwd.h>
#include <signal.h>
@ -176,6 +179,10 @@ char *ssh_program = _PATH_SSH_PROGRAM;
pid_t do_cmd_pid = -1;
pid_t do_cmd_pid2 = -1;
/* SFTP copy parameters */
size_t sftp_copy_buflen;
size_t sftp_nrequests;
/* Needed for sftp */
volatile sig_atomic_t interrupted = 0;
@ -444,13 +451,14 @@ void throughlocal_sftp(struct sftp_conn *, struct sftp_conn *,
int
main(int argc, char **argv)
{
int ch, fflag, tflag, status, n;
int ch, fflag, tflag, status, r, n;
char **newargv, *argv0;
const char *errstr;
extern char *optarg;
extern int optind;
enum scp_mode_e mode = MODE_SFTP;
char *sftp_direct = NULL;
long long llv;
/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
sanitise_stdfd();
@ -480,7 +488,7 @@ main(int argc, char **argv)
fflag = Tflag = tflag = 0;
while ((ch = getopt(argc, argv,
"12346ABCTdfOpqRrstvD:F:J:M:P:S:c:i:l:o:")) != -1) {
"12346ABCTdfOpqRrstvD:F:J:M:P:S:c:i:l:o:X:")) != -1) {
switch (ch) {
/* User-visible flags. */
case '1':
@ -561,6 +569,31 @@ main(int argc, char **argv)
addargs(&remote_remote_args, "-q");
showprogress = 0;
break;
case 'X':
/* Please keep in sync with sftp.c -X */
if (strncmp(optarg, "buffer=", 7) == 0) {
r = scan_scaled(optarg + 7, &llv);
if (r == 0 && (llv <= 0 || llv > 256 * 1024)) {
r = -1;
errno = EINVAL;
}
if (r == -1) {
fatal("Invalid buffer size \"%s\": %s",
optarg + 7, strerror(errno));
}
sftp_copy_buflen = (size_t)llv;
} else if (strncmp(optarg, "nrequests=", 10) == 0) {
llv = strtonum(optarg + 10, 1, 256 * 1024,
&errstr);
if (errstr != NULL) {
fatal("Invalid number of requests "
"\"%s\": %s", optarg + 10, errstr);
}
sftp_nrequests = (size_t)llv;
} else {
fatal("Invalid -X option");
}
break;
/* Server options. */
case 'd':
@ -972,7 +1005,8 @@ do_sftp_connect(char *host, char *user, int port, char *sftp_direct,
reminp, remoutp, pidp) < 0)
return NULL;
}
return do_init(*reminp, *remoutp, 32768, 64, limit_kbps);
return do_init(*reminp, *remoutp,
sftp_copy_buflen, sftp_nrequests, limit_kbps);
}
void

6
sftp-client.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sftp-client.c,v 1.165 2022/09/19 10:43:12 djm Exp $ */
/* $OpenBSD: sftp-client.c,v 1.166 2022/12/16 03:40:03 djm Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
*
@ -68,10 +68,10 @@
extern volatile sig_atomic_t interrupted;
extern int showprogress;
/* Default size of buffer for up/download */
/* Default size of buffer for up/download (fix sftp.1 scp.1 if changed) */
#define DEFAULT_COPY_BUFLEN 32768
/* Default number of concurrent outstanding requests */
/* Default number of concurrent xfer requests (fix sftp.1 scp.1 if changed) */
#define DEFAULT_NUM_REQUESTS 64
/* Minimum amount of data to read at a time */

18
sftp.1
View File

@ -1,4 +1,4 @@
.\" $OpenBSD: sftp.1,v 1.142 2022/09/19 21:39:16 djm Exp $
.\" $OpenBSD: sftp.1,v 1.143 2022/12/16 03:40:03 djm Exp $
.\"
.\" Copyright (c) 2001 Damien Miller. All rights reserved.
.\"
@ -22,7 +22,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: September 19 2022 $
.Dd $Mdocdate: December 16 2022 $
.Dt SFTP 1
.Os
.Sh NAME
@ -44,6 +44,7 @@
.Op Fl R Ar num_requests
.Op Fl S Ar program
.Op Fl s Ar subsystem | sftp_server
.Op Fl X Ar sftp_option
.Ar destination
.Sh DESCRIPTION
.Nm
@ -320,6 +321,19 @@ does not have an sftp subsystem configured.
.It Fl v
Raise logging level.
This option is also passed to ssh.
.It Fl X Ar sftp_option
Specify an option that controls aspects of SFTP protocol behaviour.
The valid options are:
.Bl -tag -width Ds
.It Cm nrequests Ns = Ns Ar value
Controls how many concurrent SFTP read or write requests may be in progress
at any point in time during a download or upload.
By default 64 requests may be active concurrently.
.It Cm buffer Ns = Ns Ar value
Controls the maximum buffer size for a single SFTP read/write operation used
during download or upload.
By default a 32KB buffer is used.
.El
.El
.Sh INTERACTIVE COMMANDS
Once in interactive mode,

31
sftp.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sftp.c,v 1.222 2022/09/19 10:46:00 djm Exp $ */
/* $OpenBSD: sftp.c,v 1.223 2022/12/16 03:40:03 djm Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
*
@ -2431,7 +2431,7 @@ main(int argc, char **argv)
struct sftp_conn *conn;
size_t copy_buffer_len = 0;
size_t num_requests = 0;
long long limit_kbps = 0;
long long llv, limit_kbps = 0;
/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
sanitise_stdfd();
@ -2449,7 +2449,7 @@ main(int argc, char **argv)
infile = stdin;
while ((ch = getopt(argc, argv,
"1246AafhNpqrvCc:D:i:l:o:s:S:b:B:F:J:P:R:")) != -1) {
"1246AafhNpqrvCc:D:i:l:o:s:S:b:B:F:J:P:R:X:")) != -1) {
switch (ch) {
/* Passed through to ssh(1) */
case 'A':
@ -2546,6 +2546,31 @@ main(int argc, char **argv)
ssh_program = optarg;
replacearg(&args, 0, "%s", ssh_program);
break;
case 'X':
/* Please keep in sync with ssh.c -X */
if (strncmp(optarg, "buffer=", 7) == 0) {
r = scan_scaled(optarg + 7, &llv);
if (r == 0 && (llv <= 0 || llv > 256 * 1024)) {
r = -1;
errno = EINVAL;
}
if (r == -1) {
fatal("Invalid buffer size \"%s\": %s",
optarg + 7, strerror(errno));
}
copy_buffer_len = (size_t)llv;
} else if (strncmp(optarg, "nrequests=", 10) == 0) {
llv = strtonum(optarg + 10, 1, 256 * 1024,
&errstr);
if (errstr != NULL) {
fatal("Invalid number of requests "
"\"%s\": %s", optarg + 10, errstr);
}
num_requests = (size_t)llv;
} else {
fatal("Invalid -X option");
}
break;
case 'h':
default:
usage();