#
# This patch is to provide a SFTP DTrace provider which offers an administrator
# some observability of SFTP data transfer. This was developed in-house. 
# Because this is Solaris-specific and not suitable for upstream, we will not
# contribute the changes to the upstream community.
#
diff -pur old/Makefile.in new/Makefile.in
--- old/Makefile.in
+++ new/Makefile.in
@@ -85,6 +85,7 @@ LIBSSH_OBJS=${LIBOPENSSH_OBJS} \
 	atomicio.o key.o dispatch.o mac.o uidswap.o uuencode.o misc.o utf8.o \
 	monitor_fdpass.o rijndael.o ssh-dss.o ssh-ecdsa.o ssh-rsa.o dh.o \
 	msg.o progressmeter.o dns.o entropy.o gss-genr.o umac.o umac128.o \
+	sftp_provider.o \
 	ssh-pkcs11.o smult_curve25519_ref.o \
 	poly1305.o chacha.o cipher-chachapoly.o \
 	ssh-ed25519.o digest-openssl.o digest-libc.o hmac.o \
@@ -107,7 +108,7 @@ SSHDOBJS=sshd.o auth-rhosts.o auth-passw
 	monitor_mm.o monitor.o monitor_wrap.o auth-krb5.o \
 	auth2-gss.o gss-serv.o gss-serv-krb5.o \
 	loginrec.o auth-pam.o auth-shadow.o auth-sia.o md5crypt.o \
-	sftp-server.o sftp-common.o \
+	sftp-server.o sftp-common.o sftp_provider.o \
 	sandbox-null.o sandbox-rlimit.o sandbox-systrace.o sandbox-darwin.o \
 	sandbox-seccomp-filter.o sandbox-capsicum.o sandbox-pledge.o \
 	sandbox-solaris.o
@@ -187,8 +188,8 @@ ssh-pkcs11-helper$(EXEEXT): $(LIBCOMPAT)
 ssh-keyscan$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-keyscan.o
 	$(LD) -o $@ ssh-keyscan.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh $(LIBS)
 
-sftp-server$(EXEEXT): $(LIBCOMPAT) libssh.a sftp.o sftp-common.o sftp-server.o sftp-server-main.o
-	$(LD) -o $@ sftp-server.o sftp-common.o sftp-server-main.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
+sftp-server$(EXEEXT): $(LIBCOMPAT) libssh.a sftp.o sftp-common.o sftp-server.o sftp-server-main.o sftp_provider.o
+	$(LD) -o $@ sftp-server.o sftp-common.o sftp-server-main.o sftp_provider.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
 
 sftp$(EXEEXT): $(LIBCOMPAT) libssh.a sftp.o sftp-client.o sftp-common.o sftp-glob.o progressmeter.o
 	$(LD) -o $@ progressmeter.o sftp.o sftp-client.o sftp-common.o sftp-glob.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) $(LIBEDIT)
@@ -225,9 +226,18 @@ umac128.o:	umac.c
 	    -Dumac_update=umac128_update -Dumac_final=umac128_final \
 	    -Dumac_delete=umac128_delete -Dumac_ctx=umac128_ctx
 
+# dtrace sftp
+sftp_provider.h: $(srcdir)/sftp_provider.d
+	/usr/sbin/dtrace -xnolibs -h -s $(srcdir)/sftp_provider.d \
+	    -o $(srcdir)/sftp_provider.h
+
+sftp_provider.o: sftp_provider.d sftp_provider.h sftp-server.o
+	/usr/sbin/dtrace -G -32 -xnolibs -s $(srcdir)/sftp_provider.d \
+	    sftp-server.o -o sftp_provider.o
+
 clean:	regressclean
 	rm -f *.o *.a $(TARGETS) logintest config.cache config.log
-	rm -f *.out core survey
+	rm -f *.out core survey sftp_provider.h
 	rm -f regress/unittests/test_helper/*.a
 	rm -f regress/unittests/test_helper/*.o
 	rm -f regress/unittests/sshbuf/*.o
diff -pur old/sftp-server.c new/sftp-server.c
--- old/sftp-server.c
+++ new/sftp-server.c
@@ -51,6 +51,9 @@
 
 #include "sftp.h"
 #include "sftp-common.h"
+#ifdef DTRACE_SFTP
+#include "sftp_provider_impl.h"
+#endif
 
 /* Our verbosity */
 static LogLevel log_level = SYSLOG_LEVEL_ERROR;
@@ -737,14 +740,17 @@ process_read(u_int32_t id)
 	u_int32_t len;
 	int r, handle, fd, ret, status = SSH2_FX_FAILURE;
 	u_int64_t off;
+	char *fpath;
 
 	if ((r = get_handle(iqueue, &handle)) != 0 ||
 	    (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
 	    (r = sshbuf_get_u32(iqueue, &len)) != 0)
 		fatal("%s: buffer error: %s", __func__, ssh_err(r));
 
-	debug("request %u: read \"%s\" (handle %d) off %llu len %d",
-	    id, handle_to_name(handle), handle, (unsigned long long)off, len);
+	fpath = handle_to_name(handle);
+ 
+ 	debug("request %u: read \"%s\" (handle %d) off %llu len %d",
+	    id, fpath, handle, (unsigned long long)off, len);
 	if (len > sizeof buf) {
 		len = sizeof buf;
 		debug2("read change len %d", len);
@@ -755,7 +761,13 @@ process_read(u_int32_t id)
 			error("process_read: seek failed");
 			status = errno_to_portable(errno);
 		} else {
+#ifdef DTRACE_SFTP
+		        SFTP_TRANSFER_START_OP("read", fd, fpath, len);
+#endif
 			ret = read(fd, buf, len);
+#ifdef DTRACE_SFTP
+                        SFTP_TRANSFER_DONE_OP("read", fd, fpath, ret);
+#endif
 			if (ret < 0) {
 				status = errno_to_portable(errno);
 			} else if (ret == 0) {
@@ -778,14 +790,16 @@ process_write(u_int32_t id)
 	size_t len;
 	int r, handle, fd, ret, status;
 	u_char *data;
+	char *fpath;
 
 	if ((r = get_handle(iqueue, &handle)) != 0 ||
 	    (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
 	    (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
 		fatal("%s: buffer error: %s", __func__, ssh_err(r));
 
+	fpath = handle_to_name(handle);
 	debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
-	    id, handle_to_name(handle), handle, (unsigned long long)off, len);
+	    id, fpath, handle, (unsigned long long)off, len);
 	fd = handle_to_fd(handle);
 
 	if (fd < 0)
@@ -797,7 +811,14 @@ process_write(u_int32_t id)
 			error("process_write: seek failed");
 		} else {
 /* XXX ATOMICIO ? */
+#ifdef DTRACE_SFTP
+		        SFTP_TRANSFER_START_OP("write", fd, fpath, len);
+#endif
 			ret = write(fd, data, len);
+#ifdef DTRACE_SFTP
+			SFTP_TRANSFER_DONE_OP("write", fd, fpath, ret);
+#endif
+
 			if (ret < 0) {
 				error("process_write: write failed");
 				status = errno_to_portable(errno);