- djm@cvs.openbsd.org 2002/02/13 00:59:23

     [sftp-client.c sftp-client.h sftp-glob.c sftp-glob.h sftp.h]
     [sftp-int.c sftp-int.h]
     API cleanup and backwards compat for filexfer v.0 servers; ok markus@

8 files changed, 280 insertions, 223 deletions

diff --git a/ChangeLog b/ChangeLog
index e9e0c785a..b630bd541 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -30,6 +30,10 @@
    - markus@cvs.openbsd.org 2002/02/13 00:39:15
      [readpass.c]
      readpass.c is not longer from UCB, since we now use readpassphrase(3)
+   - djm@cvs.openbsd.org 2002/02/13 00:59:23
+     [sftp-client.c sftp-client.h sftp-glob.c sftp-glob.h sftp.h]
+     [sftp-int.c sftp-int.h]
+     API cleanup and backwards compat for filexfer v.0 servers; ok markus@
 
 20020210
  - (djm) OpenBSD CVS Sync
@@ -7577,4 +7581,4 @@
  - Wrote replacements for strlcpy and mkdtemp
  - Released 1.0pre1
 
-$Id: ChangeLog,v 1.1847 2002/02/13 03:05:23 djm Exp $
+$Id: ChangeLog,v 1.1848 2002/02/13 03:10:32 djm Exp $
diff --git a/sftp-client.c b/sftp-client.c
index cb11fd581..481341c66 100644
--- a/sftp-client.c
+++ b/sftp-client.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001-2002 Damien Miller.  All rights reserved.
+ * Copyright (c) 2001,2002 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -24,11 +24,11 @@
 
 /* XXX: memleaks */
 /* XXX: signed vs unsigned */
-/* XXX: we use fatal too much, error may be more appropriate in places */
+/* XXX: remove all logging, only return status codes */
 /* XXX: copy between two remote sites */
 
 #include "includes.h"
-RCSID("$OpenBSD: sftp-client.c,v 1.22 2002/02/12 12:44:46 djm Exp $");
+RCSID("$OpenBSD: sftp-client.c,v 1.23 2002/02/13 00:59:23 djm Exp $");
 
 #if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
 #include <sys/queue.h>
@@ -50,8 +50,14 @@ RCSID("$OpenBSD: sftp-client.c,v 1.22 2002/02/12 12:44:46 djm Exp $");
 /* Minimum amount of data to read at at time */
 #define MIN_READ_SIZE   512
 
-/* Message ID */
-static u_int msg_id = 1;
+struct sftp_conn {
+        int fd_in;
+        int fd_out;
+        u_int transfer_buflen;
+        u_int num_requests;
+        u_int version;
+        u_int msg_id;
+};
 
 static void
 send_msg(int fd, Buffer *m)
@@ -219,11 +225,12 @@ get_decode_stat(int fd, u_int expected_id, int quiet)
         return(a);
 }
 
-int
-do_init(int fd_in, int fd_out)
+struct sftp_conn *
+do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests)
 {
         int type, version;
         Buffer msg;
+        struct sftp_conn *ret;
 
         buffer_init(&msg);
         buffer_put_char(&msg, SSH2_FXP_INIT);
@@ -239,7 +246,7 @@ do_init(int fd_in, int fd_out)
                 error("Invalid packet back from SSH2_FXP_INIT (type %d)",
                     type);
                 buffer_free(&msg);
-                return(-1);
+                return(NULL);
         }
         version = buffer_get_int(&msg);
 
@@ -257,25 +264,43 @@ do_init(int fd_in, int fd_out)
 
         buffer_free(&msg);
 
-        return(version);
+        ret = xmalloc(sizeof(*ret));
+        ret->fd_in = fd_in;
+        ret->fd_out = fd_out;
+        ret->transfer_buflen = transfer_buflen;
+        ret->num_requests = num_requests;
+        ret->version = version;
+        ret->msg_id = 1;
+
+        /* Some filexfer v.0 servers don't support large packets */
+        if (version == 0)
+                ret->transfer_buflen = MAX(ret->transfer_buflen, 20480);
+
+        return(ret);
+}
+
+u_int
+sftp_proto_version(struct sftp_conn *conn)
+{
+        return(conn->version);
 }
 
 int
-do_close(int fd_in, int fd_out, char *handle, u_int handle_len)
+do_close(struct sftp_conn *conn, char *handle, u_int handle_len)
 {
         u_int id, status;
         Buffer msg;
 
         buffer_init(&msg);
 
-        id = msg_id++;
+        id = conn->msg_id++;
         buffer_put_char(&msg, SSH2_FXP_CLOSE);
         buffer_put_int(&msg, id);
         buffer_put_string(&msg, handle, handle_len);
-        send_msg(fd_out, &msg);
+        send_msg(conn->fd_out, &msg);
         debug3("Sent message SSH2_FXP_CLOSE I:%d", id);
 
-        status = get_status(fd_in, id);
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
                 error("Couldn't close file: %s", fx2txt(status));
 
@@ -286,24 +311,24 @@ do_close(int fd_in, int fd_out, char *handle, u_int handle_len)
 
 
 static int
-do_lsreaddir(int fd_in, int fd_out, char *path, int printflag,
+do_lsreaddir(struct sftp_conn *conn, char *path, int printflag,
     SFTP_DIRENT ***dir)
 {
         Buffer msg;
         u_int type, id, handle_len, i, expected_id, ents = 0;
         char *handle;
 
-        id = msg_id++;
+        id = conn->msg_id++;
 
         buffer_init(&msg);
         buffer_put_char(&msg, SSH2_FXP_OPENDIR);
         buffer_put_int(&msg, id);
         buffer_put_cstring(&msg, path);
-        send_msg(fd_out, &msg);
+        send_msg(conn->fd_out, &msg);
 
         buffer_clear(&msg);
 
-        handle = get_handle(fd_in, id, &handle_len);
+        handle = get_handle(conn->fd_in, id, &handle_len);
         if (handle == NULL)
                 return(-1);
 
@@ -316,7 +341,7 @@ do_lsreaddir(int fd_in, int fd_out, char *path, int printflag,
         for (;;) {
                 int count;
 
-                id = expected_id = msg_id++;
+                id = expected_id = conn->msg_id++;
 
                 debug3("Sending SSH2_FXP_READDIR I:%d", id);
 
@@ -324,11 +349,11 @@ do_lsreaddir(int fd_in, int fd_out, char *path, int printflag,
                 buffer_put_char(&msg, SSH2_FXP_READDIR);
                 buffer_put_int(&msg, id);
                 buffer_put_string(&msg, handle, handle_len);
-                send_msg(fd_out, &msg);
+                send_msg(conn->fd_out, &msg);
 
                 buffer_clear(&msg);
 
-                get_msg(fd_in, &msg);
+                get_msg(conn->fd_in, &msg);
 
                 type = buffer_get_char(&msg);
                 id = buffer_get_int(&msg);
@@ -348,7 +373,7 @@ do_lsreaddir(int fd_in, int fd_out, char *path, int printflag,
                         } else {
                                 error("Couldn't read directory: %s",
                                     fx2txt(status));
-                                do_close(fd_in, fd_out, handle, handle_len);
+                                do_close(conn, handle, handle_len);
                                 return(status);
                         }
                 } else if (type != SSH2_FXP_NAME)
@@ -386,22 +411,22 @@ do_lsreaddir(int fd_in, int fd_out, char *path, int printflag,
         }
 
         buffer_free(&msg);
-        do_close(fd_in, fd_out, handle, handle_len);
+        do_close(conn, handle, handle_len);
         xfree(handle);
 
         return(0);
 }
 
 int
-do_ls(int fd_in, int fd_out, char *path)
+do_ls(struct sftp_conn *conn, char *path)
 {
-        return(do_lsreaddir(fd_in, fd_out, path, 1, NULL));
+        return(do_lsreaddir(conn, path, 1, NULL));
 }
 
 int
-do_readdir(int fd_in, int fd_out, char *path, SFTP_DIRENT ***dir)
+do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir)
 {
-        return(do_lsreaddir(fd_in, fd_out, path, 0, dir));
+        return(do_lsreaddir(conn, path, 0, dir));
 }
 
 void free_sftp_dirents(SFTP_DIRENT **s)
@@ -417,30 +442,31 @@ void free_sftp_dirents(SFTP_DIRENT **s)
 }
 
 int
-do_rm(int fd_in, int fd_out, char *path)
+do_rm(struct sftp_conn *conn, char *path)
 {
         u_int status, id;
 
         debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
 
-        id = msg_id++;
-        send_string_request(fd_out, id, SSH2_FXP_REMOVE, path, strlen(path));
-        status = get_status(fd_in, id);
+        id = conn->msg_id++;
+        send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, 
+            strlen(path));
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
                 error("Couldn't delete file: %s", fx2txt(status));
         return(status);
 }
 
 int
-do_mkdir(int fd_in, int fd_out, char *path, Attrib *a)
+do_mkdir(struct sftp_conn *conn, char *path, Attrib *a)
 {
         u_int status, id;
 
-        id = msg_id++;
-        send_string_attrs_request(fd_out, id, SSH2_FXP_MKDIR, path,
+        id = conn->msg_id++;
+        send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path,
             strlen(path), a);
 
-        status = get_status(fd_in, id);
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
                 error("Couldn't create directory: %s", fx2txt(status));
 
@@ -448,14 +474,15 @@ do_mkdir(int fd_in, int fd_out, char *path, Attrib *a)
 }
 
 int
-do_rmdir(int fd_in, int fd_out, char *path)
+do_rmdir(struct sftp_conn *conn, char *path)
 {
         u_int status, id;
 
-        id = msg_id++;
-        send_string_request(fd_out, id, SSH2_FXP_RMDIR, path, strlen(path));
+        id = conn->msg_id++;
+        send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path,
+            strlen(path));
 
-        status = get_status(fd_in, id);
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
                 error("Couldn't remove directory: %s", fx2txt(status));
 
@@ -463,45 +490,61 @@ do_rmdir(int fd_in, int fd_out, char *path)
 }
 
 Attrib *
-do_stat(int fd_in, int fd_out, char *path, int quiet)
+do_stat(struct sftp_conn *conn, char *path, int quiet)
 {
         u_int id;
 
-        id = msg_id++;
-        send_string_request(fd_out, id, SSH2_FXP_STAT, path, strlen(path));
-        return(get_decode_stat(fd_in, id, quiet));
+        id = conn->msg_id++;
+
+        send_string_request(conn->fd_out, id, 
+            conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, 
+            path, strlen(path));
+
+        return(get_decode_stat(conn->fd_in, id, quiet));
 }
 
 Attrib *
-do_lstat(int fd_in, int fd_out, char *path, int quiet)
+do_lstat(struct sftp_conn *conn, char *path, int quiet)
 {
         u_int id;
 
-        id = msg_id++;
-        send_string_request(fd_out, id, SSH2_FXP_LSTAT, path, strlen(path));
-        return(get_decode_stat(fd_in, id, quiet));
+        if (conn->version == 0) {
+                if (quiet)
+                        debug("Server version does not support lstat operation");
+                else
+                        error("Server version does not support lstat operation");
+                return(NULL);
+        }
+
+        id = conn->msg_id++;
+        send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path,
+            strlen(path));
+
+        return(get_decode_stat(conn->fd_in, id, quiet));
 }
 
 Attrib *
-do_fstat(int fd_in, int fd_out, char *handle, u_int handle_len, int quiet)
+do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet)
 {
         u_int id;
 
-        id = msg_id++;
-        send_string_request(fd_out, id, SSH2_FXP_FSTAT, handle, handle_len);
-        return(get_decode_stat(fd_in, id, quiet));
+        id = conn->msg_id++;
+        send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle,
+            handle_len);
+
+        return(get_decode_stat(conn->fd_in, id, quiet));
 }
 
 int
-do_setstat(int fd_in, int fd_out, char *path, Attrib *a)
+do_setstat(struct sftp_conn *conn, char *path, Attrib *a)
 {
         u_int status, id;
 
-        id = msg_id++;
-        send_string_attrs_request(fd_out, id, SSH2_FXP_SETSTAT, path,
+        id = conn->msg_id++;
+        send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path,
             strlen(path), a);
 
-        status = get_status(fd_in, id);
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
                 error("Couldn't setstat on \"%s\": %s", path,
                     fx2txt(status));
@@ -510,16 +553,16 @@ do_setstat(int fd_in, int fd_out, char *path, Attrib *a)
 }
 
 int
-do_fsetstat(int fd_in, int fd_out, char *handle, u_int handle_len,
+do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len,
     Attrib *a)
 {
         u_int status, id;
 
-        id = msg_id++;
-        send_string_attrs_request(fd_out, id, SSH2_FXP_FSETSTAT, handle,
+        id = conn->msg_id++;
+        send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle,
             handle_len, a);
 
-        status = get_status(fd_in, id);
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
                 error("Couldn't fsetstat: %s", fx2txt(status));
 
@@ -527,19 +570,20 @@ do_fsetstat(int fd_in, int fd_out, char *handle, u_int handle_len,
 }
 
 char *
-do_realpath(int fd_in, int fd_out, char *path)
+do_realpath(struct sftp_conn *conn, char *path)
 {
         Buffer msg;
         u_int type, expected_id, count, id;
         char *filename, *longname;
         Attrib *a;
 
-        expected_id = id = msg_id++;
-        send_string_request(fd_out, id, SSH2_FXP_REALPATH, path, strlen(path));
+        expected_id = id = conn->msg_id++;
+        send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path,
+            strlen(path));
 
         buffer_init(&msg);
 
-        get_msg(fd_in, &msg);
+        get_msg(conn->fd_in, &msg);
         type = buffer_get_char(&msg);
         id = buffer_get_int(&msg);
 
@@ -573,7 +617,7 @@ do_realpath(int fd_in, int fd_out, char *path)
 }
 
 int
-do_rename(int fd_in, int fd_out, char *oldpath, char *newpath)
+do_rename(struct sftp_conn *conn, char *oldpath, char *newpath)
 {
         Buffer msg;
         u_int status, id;
@@ -581,65 +625,71 @@ do_rename(int fd_in, int fd_out, char *oldpath, char *newpath)
         buffer_init(&msg);
 
         /* Send rename request */
-        id = msg_id++;
+        id = conn->msg_id++;
         buffer_put_char(&msg, SSH2_FXP_RENAME);
         buffer_put_int(&msg, id);
         buffer_put_cstring(&msg, oldpath);
         buffer_put_cstring(&msg, newpath);
-        send_msg(fd_out, &msg);
+        send_msg(conn->fd_out, &msg);
         debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath,
             newpath);
         buffer_free(&msg);
 
-        status = get_status(fd_in, id);
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
-                error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, newpath,
-                    fx2txt(status));
+                error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
+                    newpath, fx2txt(status));
 
         return(status);
 }
 
 int
-do_symlink(int fd_in, int fd_out, char *oldpath, char *newpath)
+do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath)
 {
         Buffer msg;
         u_int status, id;
 
+        if (conn->version < 3) {
+                error("This server does not support the symlink operation");
+                return(SSH2_FX_OP_UNSUPPORTED);
+        }
+
         buffer_init(&msg);
 
         /* Send rename request */
-        id = msg_id++;
+        id = conn->msg_id++;
         buffer_put_char(&msg, SSH2_FXP_SYMLINK);
         buffer_put_int(&msg, id);
         buffer_put_cstring(&msg, oldpath);
         buffer_put_cstring(&msg, newpath);
-        send_msg(fd_out, &msg);
+        send_msg(conn->fd_out, &msg);
         debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
             newpath);
         buffer_free(&msg);
 
-        status = get_status(fd_in, id);
+        status = get_status(conn->fd_in, id);
         if (status != SSH2_FX_OK)
-                error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, newpath,
-                    fx2txt(status));
+                error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
+                    newpath, fx2txt(status));
 
         return(status);
 }
 
 char *
-do_readlink(int fd_in, int fd_out, char *path)
+do_readlink(struct sftp_conn *conn, char *path)
 {
         Buffer msg;
         u_int type, expected_id, count, id;
         char *filename, *longname;
         Attrib *a;
 
-        expected_id = id = msg_id++;
-        send_string_request(fd_out, id, SSH2_FXP_READLINK, path, strlen(path));
+        expected_id = id = conn->msg_id++;
+        send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path,
+            strlen(path));
 
         buffer_init(&msg);
 
-        get_msg(fd_in, &msg);
+        get_msg(conn->fd_in, &msg);
         type = buffer_get_char(&msg);
         id = buffer_get_int(&msg);
 
@@ -690,8 +740,8 @@ send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len,
 }       
 
 int
-do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
-    int pflag, size_t buflen, int num_requests)
+do_download(struct sftp_conn *conn, char *remote_path, char *local_path,
+    int pflag)
 {
         Attrib junk, *a;
         Buffer msg;
@@ -699,7 +749,7 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
         int local_fd, status, num_req, max_req, write_error;
         int read_error, write_errno;
         u_int64_t offset, size;
-        u_int handle_len, mode, type, id;
+        u_int handle_len, mode, type, id, buflen;
         struct request {
                 u_int id;
                 u_int len;
@@ -711,7 +761,7 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
 
         TAILQ_INIT(&requests);
 
-        a = do_stat(fd_in, fd_out, remote_path, 0);
+        a = do_stat(conn, remote_path, 0);
         if (a == NULL)
                 return(-1);
 
@@ -732,33 +782,34 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
         else
                 size = 0;
 
-        local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, mode);
-        if (local_fd == -1) {
-                error("Couldn't open local file \"%s\" for writing: %s",
-                    local_path, strerror(errno));
-                return(-1);
-        }
-
+        buflen = conn->transfer_buflen;
         buffer_init(&msg);
 
         /* Send open request */
-        id = msg_id++;
+        id = conn->msg_id++;
         buffer_put_char(&msg, SSH2_FXP_OPEN);
         buffer_put_int(&msg, id);
         buffer_put_cstring(&msg, remote_path);
         buffer_put_int(&msg, SSH2_FXF_READ);
         attrib_clear(&junk); /* Send empty attributes */
         encode_attrib(&msg, &junk);
-        send_msg(fd_out, &msg);
+        send_msg(conn->fd_out, &msg);
         debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path);
 
-        handle = get_handle(fd_in, id, &handle_len);
+        handle = get_handle(conn->fd_in, id, &handle_len);
         if (handle == NULL) {
                 buffer_free(&msg);
                 close(local_fd);
                 return(-1);
         }
 
+        local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, mode);
+        if (local_fd == -1) {
+                error("Couldn't open local file \"%s\" for writing: %s",
+                    local_path, strerror(errno));
+                return(-1);
+        }
+
         /* Read from remote and write to local */
         write_error = read_error = write_errno = num_req = offset = 0;
         max_req = 1;
@@ -771,18 +822,18 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
                         debug3("Request range %llu -> %llu (%d/%d)", 
                             offset, offset + buflen - 1, num_req, max_req);
                         req = xmalloc(sizeof(*req));
-                        req->id = msg_id++;
+                        req->id = conn->msg_id++;
                         req->len = buflen;
                         req->offset = offset;
                         offset += buflen;
                         num_req++;
                         TAILQ_INSERT_TAIL(&requests, req, tq);
-                        send_read_request(fd_out, req->id, req->offset, 
+                        send_read_request(conn->fd_out, req->id, req->offset, 
                             req->len, handle, handle_len);
                 }
 
                 buffer_clear(&msg);
-                get_msg(fd_in, &msg);
+                get_msg(conn->fd_in, &msg);
                 type = buffer_get_char(&msg);
                 id = buffer_get_int(&msg);
                 debug3("Received reply T:%d I:%d R:%d", type, id, max_req);
@@ -830,12 +881,11 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
                                 debug3("Short data block, re-requesting "
                                     "%llu -> %llu (%2d)", req->offset + len, 
                                         req->offset + req->len - 1, num_req);
-                                req->id = msg_id++;
+                                req->id = conn->msg_id++;
                                 req->len -= len;
                                 req->offset += len;
-                                send_read_request(fd_out, req->id, 
-                                    req->offset, req->len, handle, 
-                                    handle_len);
+                                send_read_request(conn->fd_out, req->id, 
+                                    req->offset, req->len, handle, handle_len);
                                 /* Reduce the request size */
                                 if (len < buflen)
                                         buflen = MAX(MIN_READ_SIZE, len);
@@ -848,7 +898,7 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
                                             offset, num_req);
                                         max_req = 1;
                                 }
-                                else if (max_req < num_requests + 1) {
+                                else if (max_req < conn->num_requests + 1) {
                                         ++max_req;
                                 }
                         }
@@ -864,17 +914,16 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
                 fatal("Transfer complete, but requests still in queue");
 
         if (read_error) {
-            error("Couldn't read from remote "
-                  "file \"%s\" : %s", remote_path,
-                  fx2txt(status));
-            do_close(fd_in, fd_out, handle, handle_len);
+                error("Couldn't read from remote file \"%s\" : %s", 
+                    remote_path, fx2txt(status));
+                do_close(conn, handle, handle_len);
         } else if (write_error) {
-            error("Couldn't write to \"%s\": %s", local_path,
-                  strerror(write_errno));
-            status = -1;
-            do_close(fd_in, fd_out, handle, handle_len);
+                error("Couldn't write to \"%s\": %s", local_path,
+                    strerror(write_errno));
+                status = -1;
+                do_close(conn, handle, handle_len);
         } else {
-                status = do_close(fd_in, fd_out, handle, handle_len);
+                status = do_close(conn, handle, handle_len);
 
                 /* Override umask and utimes if asked */
 #ifdef HAVE_FCHMOD
@@ -897,12 +946,13 @@ do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
         close(local_fd);
         buffer_free(&msg);
         xfree(handle);
-        return status;
+
+        return(status);
 }
 
 int
-do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
-    int pflag, size_t buflen, int num_requests)
+do_upload(struct sftp_conn *conn, char *local_path, char *remote_path,
+    int pflag)
 {
         int local_fd, status;
         u_int handle_len, id, type;
@@ -946,18 +996,18 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
         buffer_init(&msg);
 
         /* Send open request */
-        id = msg_id++;
+        id = conn->msg_id++;
         buffer_put_char(&msg, SSH2_FXP_OPEN);
         buffer_put_int(&msg, id);
         buffer_put_cstring(&msg, remote_path);
         buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
         encode_attrib(&msg, &a);
-        send_msg(fd_out, &msg);
+        send_msg(conn->fd_out, &msg);
         debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path);
 
         buffer_clear(&msg);
 
-        handle = get_handle(fd_in, id, &handle_len);
+        handle = get_handle(conn->fd_in, id, &handle_len);
         if (handle == NULL) {
                 close(local_fd);
                 buffer_free(&msg);
@@ -965,7 +1015,7 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
         }
 
         startid = ackid = id + 1;
-        data = xmalloc(buflen);
+        data = xmalloc(conn->transfer_buflen);
 
         /* Read from local and write to remote */
         offset = 0;
@@ -977,7 +1027,7 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
                  * the last block of the file
                  */
                 do
-                        len = read(local_fd, data, buflen);
+                        len = read(local_fd, data, conn->transfer_buflen);
                 while ((len == -1) && (errno == EINTR || errno == EAGAIN));
 
                 if (len == -1)
@@ -997,7 +1047,7 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
                         buffer_put_string(&msg, handle, handle_len);
                         buffer_put_int64(&msg, offset);
                         buffer_put_string(&msg, data, len);
-                        send_msg(fd_out, &msg);
+                        send_msg(conn->fd_out, &msg);
                         debug3("Sent message SSH2_FXP_WRITE I:%d O:%llu S:%u",
                                id, (u_int64_t)offset, len);
                 } else if (TAILQ_FIRST(&acks) == NULL)
@@ -1006,9 +1056,10 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
                 if (ack == NULL)
                         fatal("Unexpected ACK %u", id);
 
-                if (id == startid || len == 0 || id - ackid >= num_requests) {
+                if (id == startid || len == 0 || 
+                    id - ackid >= conn->num_requests) {
                         buffer_clear(&msg);
-                        get_msg(fd_in, &msg);
+                        get_msg(conn->fd_in, &msg);
                         type = buffer_get_char(&msg);
                         id = buffer_get_int(&msg);
 
@@ -1031,7 +1082,7 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
                         if (status != SSH2_FX_OK) {
                                 error("Couldn't write to remote file \"%s\": %s",
                                       remote_path, fx2txt(status));
-                                do_close(fd_in, fd_out, handle, handle_len);
+                                do_close(conn, handle, handle_len);
                                 close(local_fd);
                                 goto done;
                         }
@@ -1040,7 +1091,6 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
                         ++ackid;
                         free(ack);
                 }
-
                 offset += len;
         }
         xfree(data);
@@ -1048,19 +1098,19 @@ do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
         if (close(local_fd) == -1) {
                 error("Couldn't close local file \"%s\": %s", local_path,
                     strerror(errno));
-                do_close(fd_in, fd_out, handle, handle_len);
+                do_close(conn, handle, handle_len);
                 status = -1;
                 goto done;
         }
 
         /* Override umask and utimes if asked */
         if (pflag)
-                do_fsetstat(fd_in, fd_out, handle, handle_len, &a);
+                do_fsetstat(conn, handle, handle_len, &a);
 
-        status = do_close(fd_in, fd_out, handle, handle_len);
+        status = do_close(conn, handle, handle_len);
 
 done:
         xfree(handle);
         buffer_free(&msg);
-        return status;
+        return(status);
 }
diff --git a/sftp-client.h b/sftp-client.h
index 477c8ed3b..ceda879b9 100644
--- a/sftp-client.h
+++ b/sftp-client.h
@@ -1,7 +1,7 @@
-/* $OpenBSD: sftp-client.h,v 1.8 2002/02/12 12:32:27 djm Exp $ */
+/* $OpenBSD: sftp-client.h,v 1.9 2002/02/13 00:59:23 djm Exp $ */
 
 /*
- * Copyright (c) 2001-2002 Damien Miller.  All rights reserved.
+ * Copyright (c) 2001,2002 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,6 +26,9 @@
 
 /* Client side of SSH2 filexfer protocol */
 
+#ifndef _SFTP_CLIENT_H
+#define _SFTP_CLIENT_H
+
 typedef struct SFTP_DIRENT SFTP_DIRENT;
 
 struct SFTP_DIRENT {
@@ -38,55 +41,59 @@ struct SFTP_DIRENT {
  * Initialiase a SSH filexfer connection. Returns -1 on error or
  * protocol version on success.
  */
-int do_init(int, int);
+struct sftp_conn *
+do_init(int, int, u_int, u_int);
+
+u_int
+sftp_proto_version(struct sftp_conn *);
 
 /* Close file referred to by 'handle' */
-int do_close(int, int, char *, u_int);
+int do_close(struct sftp_conn *, char *, u_int);
 
 /* List contents of directory 'path' to stdout */
-int do_ls(int, int, char *);
+int do_ls(struct sftp_conn *, char *);
 
 /* Read contents of 'path' to NULL-terminated array 'dir' */
-int do_readdir(int, int, char *, SFTP_DIRENT ***);
+int do_readdir(struct sftp_conn *, char *, SFTP_DIRENT ***);
 
 /* Frees a NULL-terminated array of SFTP_DIRENTs (eg. from do_readdir) */
 void free_sftp_dirents(SFTP_DIRENT **);
 
 /* Delete file 'path' */
-int do_rm(int, int, char *);
+int do_rm(struct sftp_conn *, char *);
 
 /* Create directory 'path' */
-int do_mkdir(int, int, char *, Attrib *);
+int do_mkdir(struct sftp_conn *, char *, Attrib *);
 
 /* Remove directory 'path' */
-int do_rmdir(int, int, char *);
+int do_rmdir(struct sftp_conn *, char *);
 
 /* Get file attributes of 'path' (follows symlinks) */
-Attrib *do_stat(int, int, char *, int);
+Attrib *do_stat(struct sftp_conn *, char *, int);
 
 /* Get file attributes of 'path' (does not follow symlinks) */
-Attrib *do_lstat(int, int, char *, int);
+Attrib *do_lstat(struct sftp_conn *, char *, int);
 
 /* Get file attributes of open file 'handle' */
-Attrib *do_fstat(int, int, char *, u_int, int);
+Attrib *do_fstat(struct sftp_conn *, char *, u_int, int);
 
 /* Set file attributes of 'path' */
-int do_setstat(int, int, char *, Attrib *);
+int do_setstat(struct sftp_conn *, char *, Attrib *);
 
 /* Set file attributes of open file 'handle' */
-int do_fsetstat(int, int, char *, u_int, Attrib *);
+int do_fsetstat(struct sftp_conn *, char *, u_int, Attrib *);
 
 /* Canonicalise 'path' - caller must free result */
-char *do_realpath(int, int, char *);
+char *do_realpath(struct sftp_conn *, char *);
 
 /* Rename 'oldpath' to 'newpath' */
-int do_rename(int, int, char *, char *);
+int do_rename(struct sftp_conn *, char *, char *);
 
 /* Rename 'oldpath' to 'newpath' */
-int do_symlink(int, int, char *, char *);
+int do_symlink(struct sftp_conn *, char *, char *);
 
 /* Return target of symlink 'path' - caller must free result */
-char *do_readlink(int, int, char *);
+char *do_readlink(struct sftp_conn *, char *);
 
 /* XXX: add callbacks to do_download/do_upload so we can do progress meter */
 
@@ -94,10 +101,12 @@ char *do_readlink(int, int, char *);
  * Download 'remote_path' to 'local_path'. Preserve permissions and times
  * if 'pflag' is set
  */
-int do_download(int, int, char *, char *, int, size_t, int);
+int do_download(struct sftp_conn *, char *, char *, int);
 
 /*
  * Upload 'local_path' to 'remote_path'. Preserve permissions and times
  * if 'pflag' is set
  */
-int do_upload(int, int, char *, char *, int , size_t, int);
+int do_upload(struct sftp_conn *, char *, char *, int);
+
+#endif
diff --git a/sftp-glob.c b/sftp-glob.c
index 849ac65ed..1234074c4 100644
--- a/sftp-glob.c
+++ b/sftp-glob.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001 Damien Miller.  All rights reserved.
+ * Copyright (c) 2001,2002 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -23,7 +23,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: sftp-glob.c,v 1.9 2001/12/19 07:18:56 deraadt Exp $");
+RCSID("$OpenBSD: sftp-glob.c,v 1.10 2002/02/13 00:59:23 djm Exp $");
 
 #include "buffer.h"
 #include "bufaux.h"
@@ -41,8 +41,7 @@ struct SFTP_OPENDIR {
 };
 
 static struct {
-        int fd_in;
-        int fd_out;
+        struct sftp_conn *conn;
 } cur;
 
 static void *
@@ -52,7 +51,7 @@ fudge_opendir(const char *path)
 
         r = xmalloc(sizeof(*r));
 
-        if (do_readdir(cur.fd_in, cur.fd_out, (char*)path, &r->dir))
+        if (do_readdir(cur.conn, (char*)path, &r->dir))
                 return(NULL);
 
         r->offset = 0;
@@ -130,7 +129,7 @@ fudge_lstat(const char *path, struct stat *st)
 {
         Attrib *a;
 
-        if (!(a = do_lstat(cur.fd_in, cur.fd_out, (char*)path, 0)))
+        if (!(a = do_lstat(cur.conn, (char*)path, 0)))
                 return(-1);
 
         attrib_to_stat(a, st);
@@ -143,7 +142,7 @@ fudge_stat(const char *path, struct stat *st)
 {
         Attrib *a;
 
-        if (!(a = do_stat(cur.fd_in, cur.fd_out, (char*)path, 0)))
+        if (!(a = do_stat(cur.conn, (char*)path, 0)))
                 return(-1);
 
         attrib_to_stat(a, st);
@@ -152,7 +151,7 @@ fudge_stat(const char *path, struct stat *st)
 }
 
 int
-remote_glob(int fd_in, int fd_out, const char *pattern, int flags,
+remote_glob(struct sftp_conn *conn, const char *pattern, int flags,
     int (*errfunc)(const char *, int), glob_t *pglob)
 {
         pglob->gl_opendir = fudge_opendir;
@@ -162,9 +161,7 @@ remote_glob(int fd_in, int fd_out, const char *pattern, int flags,
         pglob->gl_stat = fudge_stat;
 
         memset(&cur, 0, sizeof(cur));
-        cur.fd_in = fd_in;
-        cur.fd_out = fd_out;
+        cur.conn = conn;
 
-        return(glob(pattern, flags | GLOB_ALTDIRFUNC, errfunc,
-            pglob));
+        return(glob(pattern, flags | GLOB_ALTDIRFUNC, errfunc, pglob));
 }
diff --git a/sftp-glob.h b/sftp-glob.h
index 2885044ae..488b0a80b 100644
--- a/sftp-glob.h
+++ b/sftp-glob.h
@@ -1,7 +1,7 @@
-/* $OpenBSD: sftp-glob.h,v 1.5 2001/06/26 17:27:24 markus Exp $ */
+/* $OpenBSD: sftp-glob.h,v 1.6 2002/02/13 00:59:23 djm Exp $ */
 
 /*
- * Copyright (c) 2001 Damien Miller.  All rights reserved.
+ * Copyright (c) 2001,2002 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,5 +26,13 @@
 
 /* Remote sftp filename globbing */
 
+#ifndef _SFTP_GLOB_H
+#define _SFTP_GLOB_H
+
+#include "sftp-client.h"
+
 int
-remote_glob(int, int, const char *, int, int (*)(const char *, int), glob_t *);
+remote_glob(struct sftp_conn *, const char *, int, 
+    int (*)(const char *, int), glob_t *);
+
+#endif
diff --git a/sftp-int.c b/sftp-int.c
index babc0ed60..5de93891a 100644
--- a/sftp-int.c
+++ b/sftp-int.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001 Damien Miller.  All rights reserved.
+ * Copyright (c) 2001,2002 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,7 +26,7 @@
 /* XXX: recursive operations */
 
 #include "includes.h"
-RCSID("$OpenBSD: sftp-int.c,v 1.43 2002/02/12 12:32:27 djm Exp $");
+RCSID("$OpenBSD: sftp-int.c,v 1.44 2002/02/13 00:59:23 djm Exp $");
 
 #include "buffer.h"
 #include "xmalloc.h"
@@ -48,9 +48,6 @@ extern size_t copy_buffer_len;
 /* Number of concurrent outstanding requests */
 extern int num_requests;
 
-/* Version of server we are speaking to */
-int version;
-
 /* Seperators for interactive commands */
 #define WHITESPACE " \t\r\n"
 
@@ -336,12 +333,12 @@ is_dir(char *path)
 }
 
 static int
-remote_is_dir(int in, int out, char *path)
+remote_is_dir(struct sftp_conn *conn, char *path)
 {
         Attrib *a;
 
         /* XXX: report errors? */
-        if ((a = do_stat(in, out, path, 1)) == NULL)
+        if ((a = do_stat(conn, path, 1)) == NULL)
                 return(0);
         if (!(a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS))
                 return(0);
@@ -349,7 +346,7 @@ remote_is_dir(int in, int out, char *path)
 }
 
 static int
-process_get(int in, int out, char *src, char *dst, char *pwd, int pflag)
+process_get(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
 {
         char *abs_src = NULL;
         char *abs_dst = NULL;
@@ -363,7 +360,7 @@ process_get(int in, int out, char *src, char *dst, char *pwd, int pflag)
 
         memset(&g, 0, sizeof(g));
         debug3("Looking up %s", abs_src);
-        if (remote_glob(in, out, abs_src, 0, NULL, &g)) {
+        if (remote_glob(conn, abs_src, 0, NULL, &g)) {
                 error("File \"%s\" not found.", abs_src);
                 err = -1;
                 goto out;
@@ -387,8 +384,7 @@ process_get(int in, int out, char *src, char *dst, char *pwd, int pflag)
                         goto out;
                 }
                 printf("Fetching %s to %s\n", g.gl_pathv[0], abs_dst);
-                err = do_download(in, out, g.gl_pathv[0], abs_dst, pflag,
-                    copy_buffer_len, num_requests);
+                err = do_download(conn, g.gl_pathv[0], abs_dst, pflag);
                 goto out;
         }
 
@@ -412,8 +408,7 @@ process_get(int in, int out, char *src, char *dst, char *pwd, int pflag)
                         abs_dst = tmp;
 
                 printf("Fetching %s to %s\n", g.gl_pathv[i], abs_dst);
-                if (do_download(in, out, g.gl_pathv[i], abs_dst, pflag,
-                    copy_buffer_len, num_requests) == -1)
+                if (do_download(conn, g.gl_pathv[i], abs_dst, pflag) == -1)
                         err = -1;
                 xfree(abs_dst);
                 abs_dst = NULL;
@@ -428,7 +423,7 @@ out:
 }
 
 static int
-process_put(int in, int out, char *src, char *dst, char *pwd, int pflag)
+process_put(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
 {
         char *tmp_dst = NULL;
         char *abs_dst = NULL;
@@ -454,7 +449,7 @@ process_put(int in, int out, char *src, char *dst, char *pwd, int pflag)
         if (g.gl_pathv[0] && g.gl_matchc == 1) {
                 if (tmp_dst) {
                         /* If directory specified, append filename */
-                        if (remote_is_dir(in, out, tmp_dst)) {
+                        if (remote_is_dir(conn, tmp_dst)) {
                                 if (infer_path(g.gl_pathv[0], &tmp)) {
                                         err = 1;
                                         goto out;
@@ -471,13 +466,12 @@ process_put(int in, int out, char *src, char *dst, char *pwd, int pflag)
                         abs_dst = make_absolute(abs_dst, pwd);
                 }
                 printf("Uploading %s to %s\n", g.gl_pathv[0], abs_dst);
-                err = do_upload(in, out, g.gl_pathv[0], abs_dst, pflag,
-                    copy_buffer_len, num_requests);
+                err = do_upload(conn, g.gl_pathv[0], abs_dst, pflag);
                 goto out;
         }
 
         /* Multiple matches, dst may be directory or unspecified */
-        if (tmp_dst && !remote_is_dir(in, out, tmp_dst)) {
+        if (tmp_dst && !remote_is_dir(conn, tmp_dst)) {
                 error("Multiple files match, but \"%s\" is not a directory",
                     tmp_dst);
                 err = -1;
@@ -496,8 +490,7 @@ process_put(int in, int out, char *src, char *dst, char *pwd, int pflag)
                         abs_dst = make_absolute(tmp, pwd);
 
                 printf("Uploading %s to %s\n", g.gl_pathv[i], abs_dst);
-                if (do_upload(in, out, g.gl_pathv[i], abs_dst, pflag, 
-                    copy_buffer_len, num_requests) == -1)
+                if (do_upload(conn, g.gl_pathv[i], abs_dst, pflag) == -1)
                         err = -1;
         }
 
@@ -655,7 +648,7 @@ parse_args(const char **cpp, int *pflag, unsigned long *n_arg,
 }
 
 static int
-parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
+parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd)
 {
         char *path1, *path2, *tmp;
         int pflag, cmdnum, i;
@@ -675,32 +668,26 @@ parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
         case -1:
                 break;
         case I_GET:
-                err = process_get(in, out, path1, path2, *pwd, pflag);
+                err = process_get(conn, path1, path2, *pwd, pflag);
                 break;
         case I_PUT:
-                err = process_put(in, out, path1, path2, *pwd, pflag);
+                err = process_put(conn, path1, path2, *pwd, pflag);
                 break;
         case I_RENAME:
                 path1 = make_absolute(path1, *pwd);
                 path2 = make_absolute(path2, *pwd);
-                err = do_rename(in, out, path1, path2);
+                err = do_rename(conn, path1, path2);
                 break;
         case I_SYMLINK:
-                if (version < 3) {
-                        error("The server (version %d) does not support "
-                            "this operation", version);
-                        err = -1;
-                } else {
-                        path2 = make_absolute(path2, *pwd);
-                        err = do_symlink(in, out, path1, path2);
-                }
+                path2 = make_absolute(path2, *pwd);
+                err = do_symlink(conn, path1, path2);
                 break;
         case I_RM:
                 path1 = make_absolute(path1, *pwd);
-                remote_glob(in, out, path1, GLOB_NOCHECK, NULL, &g);
+                remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
                 for (i = 0; g.gl_pathv[i]; i++) {
                         printf("Removing %s\n", g.gl_pathv[i]);
-                        if (do_rm(in, out, g.gl_pathv[i]) == -1)
+                        if (do_rm(conn, g.gl_pathv[i]) == -1)
                                 err = -1;
                 }
                 break;
@@ -709,19 +696,19 @@ parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
                 attrib_clear(&a);
                 a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
                 a.perm = 0777;
-                err = do_mkdir(in, out, path1, &a);
+                err = do_mkdir(conn, path1, &a);
                 break;
         case I_RMDIR:
                 path1 = make_absolute(path1, *pwd);
-                err = do_rmdir(in, out, path1);
+                err = do_rmdir(conn, path1);
                 break;
         case I_CHDIR:
                 path1 = make_absolute(path1, *pwd);
-                if ((tmp = do_realpath(in, out, path1)) == NULL) {
+                if ((tmp = do_realpath(conn, path1)) == NULL) {
                         err = 1;
                         break;
                 }
-                if ((aa = do_stat(in, out, tmp, 0)) == NULL) {
+                if ((aa = do_stat(conn, tmp, 0)) == NULL) {
                         xfree(tmp);
                         err = 1;
                         break;
@@ -744,22 +731,22 @@ parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
                 break;
         case I_LS:
                 if (!path1) {
-                        do_ls(in, out, *pwd);
+                        do_ls(conn, *pwd);
                         break;
                 }
                 path1 = make_absolute(path1, *pwd);
-                if ((tmp = do_realpath(in, out, path1)) == NULL)
+                if ((tmp = do_realpath(conn, path1)) == NULL)
                         break;
                 xfree(path1);
                 path1 = tmp;
-                if ((aa = do_stat(in, out, path1, 0)) == NULL)
+                if ((aa = do_stat(conn, path1, 0)) == NULL)
                         break;
                 if ((aa->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
                     !S_ISDIR(aa->perm)) {
                         error("Can't ls: \"%s\" is not a directory", path1);
                         break;
                 }
-                do_ls(in, out, path1);
+                do_ls(conn, path1);
                 break;
         case I_LCHDIR:
                 if (chdir(path1) == -1) {
@@ -790,17 +777,17 @@ parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
                 attrib_clear(&a);
                 a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
                 a.perm = n_arg;
-                remote_glob(in, out, path1, GLOB_NOCHECK, NULL, &g);
+                remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
                 for (i = 0; g.gl_pathv[i]; i++) {
                         printf("Changing mode on %s\n", g.gl_pathv[i]);
-                        do_setstat(in, out, g.gl_pathv[i], &a);
+                        do_setstat(conn, g.gl_pathv[i], &a);
                 }
                 break;
         case I_CHOWN:
                 path1 = make_absolute(path1, *pwd);
-                remote_glob(in, out, path1, GLOB_NOCHECK, NULL, &g);
+                remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
                 for (i = 0; g.gl_pathv[i]; i++) {
-                        if (!(aa = do_stat(in, out, g.gl_pathv[i], 0)))
+                        if (!(aa = do_stat(conn, g.gl_pathv[i], 0)))
                                 continue;
                         if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
                                 error("Can't get current ownership of "
@@ -810,14 +797,14 @@ parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
                         printf("Changing owner on %s\n", g.gl_pathv[i]);
                         aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
                         aa->uid = n_arg;
-                        do_setstat(in, out, g.gl_pathv[i], aa);
+                        do_setstat(conn, g.gl_pathv[i], aa);
                 }
                 break;
         case I_CHGRP:
                 path1 = make_absolute(path1, *pwd);
-                remote_glob(in, out, path1, GLOB_NOCHECK, NULL, &g);
+                remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
                 for (i = 0; g.gl_pathv[i]; i++) {
-                        if (!(aa = do_stat(in, out, g.gl_pathv[i], 0)))
+                        if (!(aa = do_stat(conn, g.gl_pathv[i], 0)))
                                 continue;
                         if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
                                 error("Can't get current ownership of "
@@ -827,7 +814,7 @@ parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
                         printf("Changing group on %s\n", g.gl_pathv[i]);
                         aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
                         aa->gid = n_arg;
-                        do_setstat(in, out, g.gl_pathv[i], aa);
+                        do_setstat(conn, g.gl_pathv[i], aa);
                 }
                 break;
         case I_PWD:
@@ -847,7 +834,7 @@ parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
                 help();
                 break;
         case I_VERSION:
-                printf("SFTP protocol version %d\n", version);
+                printf("SFTP protocol version %d\n", sftp_proto_version(conn));
                 break;
         default:
                 fatal("%d is not implemented", cmdnum);
@@ -873,12 +860,13 @@ interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
         char *pwd;
         char *dir = NULL;
         char cmd[2048];
+        struct sftp_conn *conn;
 
-        version = do_init(fd_in, fd_out);
-        if (version == -1)
+        conn = do_init(fd_in, fd_out, copy_buffer_len, num_requests);
+        if (conn == NULL)
                 fatal("Couldn't initialise connection to server");
 
-        pwd = do_realpath(fd_in, fd_out, ".");
+        pwd = do_realpath(conn, ".");
         if (pwd == NULL)
                 fatal("Need cwd");
 
@@ -886,10 +874,10 @@ interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
                 dir = xstrdup(file1);
                 dir = make_absolute(dir, pwd);
 
-                if (remote_is_dir(fd_in, fd_out, dir) && file2 == NULL) {
+                if (remote_is_dir(conn, dir) && file2 == NULL) {
                         printf("Changing to: %s\n", dir);
                         snprintf(cmd, sizeof cmd, "cd \"%s\"", dir);
-                        parse_dispatch_command(fd_in, fd_out, cmd, &pwd);
+                        parse_dispatch_command(conn, cmd, &pwd);
                 } else {
                         if (file2 == NULL)
                                 snprintf(cmd, sizeof cmd, "get %s", dir);
@@ -897,7 +885,7 @@ interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
                                 snprintf(cmd, sizeof cmd, "get %s %s", dir,
                                     file2);
 
-                        parse_dispatch_command(fd_in, fd_out, cmd, &pwd);
+                        parse_dispatch_command(conn, cmd, &pwd);
                         return;
                 }
         }
@@ -925,7 +913,7 @@ interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
                 if (cp)
                         *cp = '\0';
 
-                if (parse_dispatch_command(fd_in, fd_out, cmd, &pwd))
+                if (parse_dispatch_command(conn, cmd, &pwd))
                         break;
         }
         xfree(pwd);
diff --git a/sftp-int.h b/sftp-int.h
index 699e758b1..976875812 100644
--- a/sftp-int.h
+++ b/sftp-int.h
@@ -1,7 +1,7 @@
-/* $OpenBSD: sftp-int.h,v 1.4 2001/06/26 17:27:25 markus Exp $ */
+/* $OpenBSD: sftp-int.h,v 1.5 2002/02/13 00:59:23 djm Exp $ */
 
 /*
- * Copyright (c) 2001 Damien Miller.  All rights reserved.
+ * Copyright (c) 2001,2002 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/sftp.h b/sftp.h
index 2ad95864b..675c6086e 100644
--- a/sftp.h
+++ b/sftp.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: sftp.h,v 1.3 2001/03/07 10:11:23 djm Exp $    */
+/*      $OpenBSD: sftp.h,v 1.4 2002/02/13 00:59:23 djm Exp $    */
 
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
@@ -38,6 +38,7 @@
 #define SSH2_FXP_READ                   5
 #define SSH2_FXP_WRITE                  6
 #define SSH2_FXP_LSTAT                  7
+#define SSH2_FXP_STAT_VERSION_0         7
 #define SSH2_FXP_FSTAT                  8
 #define SSH2_FXP_SETSTAT                9
 #define SSH2_FXP_FSETSTAT               10