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authorDamien Miller <djm@cvs.openbsd.org>2004-05-19 12:17:34 +0000
committerDamien Miller <djm@cvs.openbsd.org>2004-05-19 12:17:34 +0000
commitd3dd12ac3cf2eb1a8016764837f8b0ea12fdcae1 (patch)
tree7d1a1b35487e98a0b03606f451829afcbdfc140e /usr.bin/ssh/sftp.c
parent6139f3618c4d02f89c6bed396c66964f873848f2 (diff)
gracefully abort transfers on receipt of SIGINT, also ignore SIGINT while
waiting for a command; ok markus@
Diffstat (limited to 'usr.bin/ssh/sftp.c')
-rw-r--r--usr.bin/ssh/sftp.c64
1 files changed, 47 insertions, 17 deletions
diff --git a/usr.bin/ssh/sftp.c b/usr.bin/ssh/sftp.c
index a2cf19314b1..443d3ffc79a 100644
--- a/usr.bin/ssh/sftp.c
+++ b/usr.bin/ssh/sftp.c
@@ -16,7 +16,7 @@
#include "includes.h"
-RCSID("$OpenBSD: sftp.c,v 1.45 2004/03/03 09:31:20 djm Exp $");
+RCSID("$OpenBSD: sftp.c,v 1.46 2004/05/19 12:17:33 djm Exp $");
#include <glob.h>
@@ -48,6 +48,9 @@ static pid_t sshpid = -1;
/* This is set to 0 if the progressmeter is not desired. */
int showprogress = 1;
+/* SIGINT received during command processing */
+volatile sig_atomic_t interrupted = 0;
+
int remote_glob(struct sftp_conn *, const char *, int,
int (*)(const char *, int), glob_t *); /* proto for sftp-glob.c */
@@ -127,6 +130,24 @@ static const struct CMD cmds[] = {
int interactive_loop(int fd_in, int fd_out, char *file1, char *file2);
static void
+killchild(int signo)
+{
+ if (sshpid > 1)
+ kill(sshpid, SIGTERM);
+
+ _exit(1);
+}
+
+static void
+cmd_interrupt(int signo)
+{
+ const char msg[] = "\rInterrupt \n";
+
+ write(STDERR_FILENO, msg, sizeof(msg) - 1);
+ interrupted = 1;
+}
+
+static void
help(void)
{
printf("Available commands:\n");
@@ -461,7 +482,7 @@ process_get(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
goto out;
}
- for (i = 0; g.gl_pathv[i]; i++) {
+ for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
if (infer_path(g.gl_pathv[i], &tmp)) {
err = -1;
goto out;
@@ -530,7 +551,7 @@ process_put(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
goto out;
}
- for (i = 0; g.gl_pathv[i]; i++) {
+ for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
if (!is_reg(g.gl_pathv[i])) {
error("skipping non-regular file %s",
g.gl_pathv[i]);
@@ -617,7 +638,7 @@ do_ls_dir(struct sftp_conn *conn, char *path, char *strip_path, int lflag)
qsort(d, n, sizeof(*d), sdirent_comp);
- for (n = 0; d[n] != NULL; n++) {
+ for (n = 0; d[n] != NULL && !interrupted; n++) {
char *tmp, *fname;
tmp = path_append(path, d[n]->filename);
@@ -669,6 +690,9 @@ do_globbed_ls(struct sftp_conn *conn, char *path, char *strip_path,
return (-1);
}
+ if (interrupted)
+ goto out;
+
/*
* If the glob returns a single match, which is the same as the
* input glob, and it is a directory, then just list its contents
@@ -702,7 +726,7 @@ do_globbed_ls(struct sftp_conn *conn, char *path, char *strip_path,
colspace = width / columns;
}
- for (i = 0; g.gl_pathv[i]; i++) {
+ for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
char *fname;
fname = path_strip(g.gl_pathv[i], strip_path);
@@ -739,6 +763,7 @@ do_globbed_ls(struct sftp_conn *conn, char *path, char *strip_path,
if (!(lflag & LONG_VIEW) && (c != 1))
printf("\n");
+ out:
if (g.gl_pathc)
globfree(&g);
@@ -948,7 +973,7 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
case I_RM:
path1 = make_absolute(path1, *pwd);
remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
- for (i = 0; g.gl_pathv[i]; i++) {
+ for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
printf("Removing %s\n", g.gl_pathv[i]);
err = do_rm(conn, g.gl_pathv[i]);
if (err != 0 && err_abort)
@@ -1037,7 +1062,7 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
a.perm = n_arg;
remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
- for (i = 0; g.gl_pathv[i]; i++) {
+ for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
printf("Changing mode on %s\n", g.gl_pathv[i]);
err = do_setstat(conn, g.gl_pathv[i], &a);
if (err != 0 && err_abort)
@@ -1048,7 +1073,7 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
case I_CHGRP:
path1 = make_absolute(path1, *pwd);
remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
- for (i = 0; g.gl_pathv[i]; i++) {
+ for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
if (!(aa = do_stat(conn, g.gl_pathv[i], 0))) {
if (err != 0 && err_abort)
break;
@@ -1171,6 +1196,8 @@ interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
for (;;) {
char *cp;
+ signal(SIGINT, SIG_IGN);
+
printf("sftp> ");
/* XXX: use libedit */
@@ -1186,6 +1213,10 @@ interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
if (cp)
*cp = '\0';
+ /* Handle user interrupts gracefully during commands */
+ interrupted = 0;
+ signal(SIGINT, cmd_interrupt);
+
err = parse_dispatch_command(conn, cmd, &pwd, batchmode);
if (err != 0)
break;
@@ -1197,15 +1228,6 @@ interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
}
static void
-killchild(int signo)
-{
- if (sshpid > 1)
- kill(sshpid, signo);
-
- _exit(1);
-}
-
-static void
connect_to_server(char *path, char **args, int *in, int *out)
{
int c_in, c_out;
@@ -1240,6 +1262,14 @@ connect_to_server(char *path, char **args, int *in, int *out)
close(*out);
close(c_in);
close(c_out);
+
+ /*
+ * The underlying ssh is in the same process group, so we must
+ * ignore SIGINT if we want to gracefully abort commands,
+ * otherwise the signal will make it to the ssh process and
+ * kill it too
+ */
+ signal(SIGINT, SIG_IGN);
execv(path, args);
fprintf(stderr, "exec: %s: %s\n", path, strerror(errno));
exit(1);