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authorDamien Miller <djm@mindrot.org>2000-08-23 10:46:23 +1000
committerDamien Miller <djm@mindrot.org>2000-08-23 10:46:23 +1000
commitad833b3e65c1887674714d514eb818d862bb499a (patch)
tree16fa75fe42aede072c5d3edac562c2870d1bb0e5 /clientloop.c
parentb078567bf5de1dcf12d265d98acb4dc9eba8b325 (diff)
- (djm) Pick up LOGIN_PROGRAM from environment or PATH if not set by headers
- (djm) OpenBSD CVS updates: - deraadt@cvs.openbsd.org 2000/08/18 20:07:23 [ssh.c] accept remsh as a valid name as well; roman@buildpoint.com - deraadt@cvs.openbsd.org 2000/08/18 20:17:13 [deattack.c crc32.c packet.c] rename crc32() to ssh_crc32() to avoid zlib name clash. do not move to libz crc32 function yet, because it has ugly "long"'s in it; oneill@cs.sfu.ca - deraadt@cvs.openbsd.org 2000/08/18 20:26:08 [scp.1 scp.c] -S prog support; tv@debian.org - deraadt@cvs.openbsd.org 2000/08/18 20:50:07 [scp.c] knf - deraadt@cvs.openbsd.org 2000/08/18 20:57:33 [log-client.c] shorten - markus@cvs.openbsd.org 2000/08/19 12:48:11 [channels.c channels.h clientloop.c ssh.c ssh.h] support for ~. in ssh2 - deraadt@cvs.openbsd.org 2000/08/19 15:29:40 [crc32.h] proper prototype - markus@cvs.openbsd.org 2000/08/19 15:34:44 [authfd.c authfd.h key.c key.h ssh-add.1 ssh-add.c ssh-agent.1] [ssh-agent.c ssh-keygen.c sshconnect1.c sshconnect2.c Makefile] [fingerprint.c fingerprint.h] add SSH2/DSA support to the agent and some other DSA related cleanups. (note that we cannot talk to ssh.com's ssh2 agents) - markus@cvs.openbsd.org 2000/08/19 15:55:52 [channels.c channels.h clientloop.c] more ~ support for ssh2 - markus@cvs.openbsd.org 2000/08/19 16:21:19 [clientloop.c] oops - millert@cvs.openbsd.org 2000/08/20 12:25:53 [session.c] We have to stash the result of get_remote_name_or_ip() before we close our socket or getpeername() will get EBADF and the process will exit. Only a problem for "UseLogin yes". - millert@cvs.openbsd.org 2000/08/20 12:30:59 [session.c] Only check /etc/nologin if "UseLogin no" since login(1) may have its own policy on determining who is allowed to login when /etc/nologin is present. Also use the _PATH_NOLOGIN define. - millert@cvs.openbsd.org 2000/08/20 12:42:43 [auth1.c auth2.c session.c ssh.c] Add calls to setusercontext() and login_get*(). We basically call setusercontext() in most places where previously we did a setlogin(). Add default login.conf file and put root in the "daemon" login class. - millert@cvs.openbsd.org 2000/08/21 10:23:31 [session.c] Fix incorrect PATH setting; noted by Markus.
Diffstat (limited to 'clientloop.c')
-rw-r--r--clientloop.c340
1 files changed, 181 insertions, 159 deletions
diff --git a/clientloop.c b/clientloop.c
index 67fa36d9..d339e127 100644
--- a/clientloop.c
+++ b/clientloop.c
@@ -16,7 +16,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.29 2000/07/16 08:27:21 markus Exp $");
+RCSID("$OpenBSD: clientloop.c,v 1.32 2000/08/19 22:21:19 markus Exp $");
#include "xmalloc.h"
#include "ssh.h"
@@ -29,6 +29,9 @@ RCSID("$OpenBSD: clientloop.c,v 1.29 2000/07/16 08:27:21 markus Exp $");
#include "channels.h"
#include "dispatch.h"
+#include "buffer.h"
+#include "bufaux.h"
+
/* Flag indicating that stdin should be redirected from /dev/null. */
extern int stdin_null_flag;
@@ -60,6 +63,8 @@ static int in_raw_mode = 0;
static int in_non_blocking_mode = 0;
/* Common data for the client loop code. */
+static int quit_pending; /* Set to non-zero to quit the client loop. */
+static int escape_char; /* Escape character. */
static int escape_pending; /* Last character was the escape character */
static int last_was_cr; /* Last character was a newline. */
static int exit_status; /* Used to store the exit status of the command. */
@@ -67,13 +72,11 @@ static int stdin_eof; /* EOF has been encountered on standard error. */
static Buffer stdin_buffer; /* Buffer for stdin data. */
static Buffer stdout_buffer; /* Buffer for stdout data. */
static Buffer stderr_buffer; /* Buffer for stderr data. */
+static unsigned long stdin_bytes, stdout_bytes, stderr_bytes;
static unsigned int buffer_high;/* Soft max buffer size. */
static int max_fd; /* Maximum file descriptor number in select(). */
static int connection_in; /* Connection to server (input). */
static int connection_out; /* Connection to server (output). */
-static unsigned long stdin_bytes, stdout_bytes, stderr_bytes;
-static int quit_pending; /* Set to non-zero to quit the client loop. */
-static int escape_char; /* Escape character. */
void client_init_dispatch(void);
@@ -379,17 +382,15 @@ client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
}
void
-client_suspend_self()
+client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
{
struct winsize oldws, newws;
/* Flush stdout and stderr buffers. */
- if (buffer_len(&stdout_buffer) > 0)
- atomicio(write, fileno(stdout), buffer_ptr(&stdout_buffer),
- buffer_len(&stdout_buffer));
- if (buffer_len(&stderr_buffer) > 0)
- atomicio(write, fileno(stderr), buffer_ptr(&stderr_buffer),
- buffer_len(&stderr_buffer));
+ if (buffer_len(bout) > 0)
+ atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
+ if (buffer_len(berr) > 0)
+ atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
leave_raw_mode();
@@ -397,9 +398,9 @@ client_suspend_self()
* Free (and clear) the buffer to reduce the amount of data that gets
* written to swap.
*/
- buffer_free(&stdin_buffer);
- buffer_free(&stdout_buffer);
- buffer_free(&stderr_buffer);
+ buffer_free(bin);
+ buffer_free(bout);
+ buffer_free(berr);
/* Save old window size. */
ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
@@ -416,9 +417,9 @@ client_suspend_self()
received_window_change_signal = 1;
/* OK, we have been continued by the user. Reinitialize buffers. */
- buffer_init(&stdin_buffer);
- buffer_init(&stdout_buffer);
- buffer_init(&stderr_buffer);
+ buffer_init(bin);
+ buffer_init(bout);
+ buffer_init(berr);
enter_raw_mode();
}
@@ -466,12 +467,155 @@ client_process_net_input(fd_set * readset)
}
}
+/* process the characters one by one */
+int
+process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
+{
+ char string[1024];
+ pid_t pid;
+ int bytes = 0;
+ unsigned int i;
+ unsigned char ch;
+ char *s;
+
+ for (i = 0; i < len; i++) {
+ /* Get one character at a time. */
+ ch = buf[i];
+
+ if (escape_pending) {
+ /* We have previously seen an escape character. */
+ /* Clear the flag now. */
+ escape_pending = 0;
+
+ /* Process the escaped character. */
+ switch (ch) {
+ case '.':
+ /* Terminate the connection. */
+ snprintf(string, sizeof string, "%c.\r\n", escape_char);
+ buffer_append(berr, string, strlen(string));
+ /*stderr_bytes += strlen(string); XXX*/
+
+ quit_pending = 1;
+ return -1;
+
+ case 'Z' - 64:
+ /* Suspend the program. */
+ /* Print a message to that effect to the user. */
+ snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
+ buffer_append(berr, string, strlen(string));
+ /*stderr_bytes += strlen(string); XXX*/
+
+ /* Restore terminal modes and suspend. */
+ client_suspend_self(bin, bout, berr);
+
+ /* We have been continued. */
+ continue;
+
+ case '&':
+ /* XXX does not work yet with proto 2 */
+ if (compat20)
+ continue;
+ /*
+ * Detach the program (continue to serve connections,
+ * but put in background and no more new connections).
+ */
+ if (!stdin_eof) {
+ /*
+ * Sending SSH_CMSG_EOF alone does not always appear
+ * to be enough. So we try to send an EOF character
+ * first.
+ */
+ packet_start(SSH_CMSG_STDIN_DATA);
+ packet_put_string("\004", 1);
+ packet_send();
+ /* Close stdin. */
+ stdin_eof = 1;
+ if (buffer_len(bin) == 0) {
+ packet_start(SSH_CMSG_EOF);
+ packet_send();
+ }
+ }
+ /* Restore tty modes. */
+ leave_raw_mode();
+
+ /* Stop listening for new connections. */
+ channel_stop_listening();
+
+ printf("%c& [backgrounded]\n", escape_char);
+
+ /* Fork into background. */
+ pid = fork();
+ if (pid < 0) {
+ error("fork: %.100s", strerror(errno));
+ continue;
+ }
+ if (pid != 0) { /* This is the parent. */
+ /* The parent just exits. */
+ exit(0);
+ }
+ /* The child continues serving connections. */
+ continue; /*XXX ? */
+
+ case '?':
+ snprintf(string, sizeof string,
+"%c?\r\n\
+Supported escape sequences:\r\n\
+~. - terminate connection\r\n\
+~^Z - suspend ssh\r\n\
+~# - list forwarded connections\r\n\
+~& - background ssh (when waiting for connections to terminate)\r\n\
+~? - this message\r\n\
+~~ - send the escape character by typing it twice\r\n\
+(Note that escapes are only recognized immediately after newline.)\r\n",
+ escape_char);
+ buffer_append(berr, string, strlen(string));
+ continue;
+
+ case '#':
+ snprintf(string, sizeof string, "%c#\r\n", escape_char);
+ buffer_append(berr, string, strlen(string));
+ s = channel_open_message();
+ buffer_append(berr, s, strlen(s));
+ xfree(s);
+ continue;
+
+ default:
+ if (ch != escape_char) {
+ buffer_put_char(bin, escape_char);
+ bytes++;
+ }
+ /* Escaped characters fall through here */
+ break;
+ }
+ } else {
+ /*
+ * The previous character was not an escape char. Check if this
+ * is an escape.
+ */
+ if (last_was_cr && ch == escape_char) {
+ /* It is. Set the flag and continue to next character. */
+ escape_pending = 1;
+ continue;
+ }
+ }
+
+ /*
+ * Normal character. Record whether it was a newline,
+ * and append it to the buffer.
+ */
+ last_was_cr = (ch == '\r' || ch == '\n');
+ buffer_put_char(bin, ch);
+ bytes++;
+ }
+ return bytes;
+}
+
void
client_process_input(fd_set * readset)
{
+ int ret;
int len;
- pid_t pid;
- char buf[8192], *s;
+ char buf[8192];
/* Read input from stdin. */
if (FD_ISSET(fileno(stdin), readset)) {
@@ -513,145 +657,10 @@ client_process_input(fd_set * readset)
* Normal, successful read. But we have an escape character
* and have to process the characters one by one.
*/
- unsigned int i;
- for (i = 0; i < len; i++) {
- unsigned char ch;
- /* Get one character at a time. */
- ch = buf[i];
-
- if (escape_pending) {
- /* We have previously seen an escape character. */
- /* Clear the flag now. */
- escape_pending = 0;
- /* Process the escaped character. */
- switch (ch) {
- case '.':
- /* Terminate the connection. */
- snprintf(buf, sizeof buf, "%c.\r\n", escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- stderr_bytes += strlen(buf);
- quit_pending = 1;
- return;
-
- case 'Z' - 64:
- /* Suspend the program. */
- /* Print a message to that effect to the user. */
- snprintf(buf, sizeof buf, "%c^Z\r\n", escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- stderr_bytes += strlen(buf);
-
- /* Restore terminal modes and suspend. */
- client_suspend_self();
-
- /* We have been continued. */
- continue;
-
- case '&':
- /*
- * Detach the program (continue to serve connections,
- * but put in background and no more new connections).
- */
- if (!stdin_eof) {
- /*
- * Sending SSH_CMSG_EOF alone does not always appear
- * to be enough. So we try to send an EOF character
- * first.
- */
- packet_start(SSH_CMSG_STDIN_DATA);
- packet_put_string("\004", 1);
- packet_send();
- /* Close stdin. */
- stdin_eof = 1;
- if (buffer_len(&stdin_buffer) == 0) {
- packet_start(SSH_CMSG_EOF);
- packet_send();
- }
- }
- /* Restore tty modes. */
- leave_raw_mode();
-
- /* Stop listening for new connections. */
- channel_stop_listening();
-
- printf("%c& [backgrounded]\n", escape_char);
-
- /* Fork into background. */
- pid = fork();
- if (pid < 0) {
- error("fork: %.100s", strerror(errno));
- continue;
- }
- if (pid != 0) { /* This is the parent. */
- /* The parent just exits. */
- exit(0);
- }
- /* The child continues serving connections. */
- continue;
-
- case '?':
- snprintf(buf, sizeof buf,
-"%c?\r\n\
-Supported escape sequences:\r\n\
-~. - terminate connection\r\n\
-~^Z - suspend ssh\r\n\
-~# - list forwarded connections\r\n\
-~& - background ssh (when waiting for connections to terminate)\r\n\
-~? - this message\r\n\
-~~ - send the escape character by typing it twice\r\n\
-(Note that escapes are only recognized immediately after newline.)\r\n",
- escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- continue;
-
- case '#':
- snprintf(buf, sizeof buf, "%c#\r\n", escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- s = channel_open_message();
- buffer_append(&stderr_buffer, s, strlen(s));
- xfree(s);
- continue;
-
- default:
- if (ch != escape_char) {
- /*
- * Escape character followed by non-special character.
- * Append both to the input buffer.
- */
- buf[0] = escape_char;
- buf[1] = ch;
- buffer_append(&stdin_buffer, buf, 2);
- stdin_bytes += 2;
- continue;
- }
- /*
- * Note that escape character typed twice
- * falls through here; the latter gets processed
- * as a normal character below.
- */
- break;
- }
- } else {
- /*
- * The previous character was not an escape char. Check if this
- * is an escape.
- */
- if (last_was_cr && ch == escape_char) {
- /* It is. Set the flag and continue to next character. */
- escape_pending = 1;
- continue;
- }
- }
-
- /*
- * Normal character. Record whether it was a newline,
- * and append it to the buffer.
- */
- last_was_cr = (ch == '\r' || ch == '\n');
- buf[0] = ch;
- buffer_append(&stdin_buffer, buf, 1);
- stdin_bytes += 1;
- continue;
- }
+ ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
+ if (ret == -1)
+ return;
+ stdout_bytes += ret;
}
}
}
@@ -722,6 +731,15 @@ client_process_buffered_input_packets()
dispatch_run(DISPATCH_NONBLOCK, &quit_pending);
}
+/* scan buf[] for '~' before sending data to the peer */
+
+int
+simple_escape_filter(Channel *c, char *buf, int len)
+{
+ /* XXX we assume c->extended is writeable */
+ return process_escapes(&c->input, &c->output, &c->extended, buf, len);
+}
+
/*
* Implements the interactive session with the server. This is called after
* the user has been authenticated, and a command has been started on the
@@ -730,7 +748,7 @@ client_process_buffered_input_packets()
*/
int
-client_loop(int have_pty, int escape_char_arg)
+client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
{
extern Options options;
double start_time, total_time;
@@ -780,6 +798,9 @@ client_loop(int have_pty, int escape_char_arg)
if (!compat20)
client_check_initial_eof_on_stdin();
+ if (compat20 && escape_char != -1)
+ channel_register_filter(ssh2_chan_id, simple_escape_filter);
+
/* Main loop of the client for the interactive session mode. */
while (!quit_pending) {
fd_set readset, writeset;
@@ -989,6 +1010,7 @@ client_input_channel_open(int type, int plen)
/* XXX move to channels.c */
sock = x11_connect_display();
if (sock >= 0) {
+/*XXX MAXPACK */
id = channel_new("x11", SSH_CHANNEL_X11_OPEN,
sock, sock, -1, 4*1024, 32*1024, 0,
xstrdup("x11"));