upstream: Add "-h" flag to sftp chown/chgrp/chmod commands to

request they do not follow symlinks. Requires recently-committed
lsetstat@openssh.com extension on the server side.

ok markus@ dtucker@

OpenBSD-Commit-ID: f93bb3f6f7eb2fb7ef1e59126e72714f1626d604

1 files changed, 35 insertions, 8 deletions

diff --git a/sftp.c b/sftp.c
index f886b330b..0f3f89d33 100644
--- a/sftp.c
+++ b/sftp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp.c,v 1.188 2018/11/16 03:26:01 djm Exp $ */
+/* $OpenBSD: sftp.c,v 1.189 2019/01/16 23:23:45 djm Exp $ */
 /*
  * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
  *
@@ -278,9 +278,9 @@ help(void)
         printf("Available commands:\n"
             "bye                                Quit sftp\n"
             "cd path                            Change remote directory to 'path'\n"
-            "chgrp grp path                     Change group of file 'path' to 'grp'\n"
-            "chmod mode path                    Change permissions of file 'path' to 'mode'\n"
-            "chown own path                     Change owner of file 'path' to 'own'\n"
+            "chgrp [-h] grp path                Change group of file 'path' to 'grp'\n"
+            "chmod [-h] mode path               Change permissions of file 'path' to 'mode'\n"
+            "chown [-h] own path                Change owner of file 'path' to 'own'\n"
             "df [-hi] [path]                    Display statistics for current directory or\n"
             "                                   filesystem containing 'path'\n"
             "exit                               Quit sftp\n"
@@ -562,6 +562,30 @@ parse_df_flags(const char *cmd, char **argv, int argc, int *hflag, int *iflag)
 }
 
 static int
+parse_ch_flags(const char *cmd, char **argv, int argc, int *hflag)
+{
+        extern int opterr, optind, optopt, optreset;
+        int ch;
+
+        optind = optreset = 1;
+        opterr = 0;
+
+        *hflag = 0;
+        while ((ch = getopt(argc, argv, "h")) != -1) {
+                switch (ch) {
+                case 'h':
+                        *hflag = 1;
+                        break;
+                default:
+                        error("%s: Invalid flag -%c", cmd, optopt);
+                        return -1;
+                }
+        }
+
+        return optind;
+}
+
+static int
 parse_no_flags(const char *cmd, char **argv, int argc)
 {
         extern int opterr, optind, optopt, optreset;
@@ -1456,7 +1480,7 @@ parse_args(const char **cpp, int *ignore_errors, int *disable_echo, int *aflag,
                 /* FALLTHROUGH */
         case I_CHOWN:
         case I_CHGRP:
-                if ((optidx = parse_no_flags(cmd, argv, argc)) == -1)
+                if ((optidx = parse_ch_flags(cmd, argv, argc, hflag)) == -1)
                         return -1;
                 /* Get numeric arg (mandatory) */
                 if (argc - optidx < 1)
@@ -1675,7 +1699,8 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
                         if (!quiet)
                                 mprintf("Changing mode on %s\n",
                                     g.gl_pathv[i]);
-                        err = do_setstat(conn, g.gl_pathv[i], &a);
+                        err = (hflag ? do_lsetstat : do_setstat)(conn,
+                            g.gl_pathv[i], &a);
                         if (err != 0 && err_abort)
                                 break;
                 }
@@ -1685,7 +1710,8 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
                 path1 = make_absolute(path1, *pwd);
                 remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
                 for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
-                        if (!(aa = do_stat(conn, g.gl_pathv[i], 0))) {
+                        if (!(aa = (hflag ? do_lstat : do_stat)(conn,
+                            g.gl_pathv[i], 0))) {
                                 if (err_abort) {
                                         err = -1;
                                         break;
@@ -1713,7 +1739,8 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
                                             g.gl_pathv[i]);
                                 aa->gid = n_arg;
                         }
-                        err = do_setstat(conn, g.gl_pathv[i], aa);
+                        err = (hflag ? do_lsetstat : do_setstat)(conn,
+                            g.gl_pathv[i], aa);
                         if (err != 0 && err_abort)
                                 break;
                 }