upstream commit
avoid fatal() calls in packet code makes ssh-keyscan more
reliable against server failures ok dtucker@ markus@
diff --git a/opacket.c b/opacket.c
index 63b419d..a137b5a 100644
--- a/opacket.c
+++ b/opacket.c
@@ -255,8 +255,20 @@
u_char type;
int r;
- if ((r = ssh_packet_read_seqnr(active_state, &type, seqnr)))
- fatal("%s: %s", __func__, ssh_err(r));
+ if ((r = ssh_packet_read_seqnr(active_state, &type, seqnr)) != 0) {
+ switch (r) {
+ case SSH_ERR_CONN_CLOSED:
+ logit("Connection closed by %.200s",
+ ssh_remote_ipaddr(active_state));
+ cleanup_exit(255);
+ case SSH_ERR_CONN_TIMEOUT:
+ logit("Connection to %.200s timed out while "
+ "waiting to read", ssh_remote_ipaddr(active_state));
+ cleanup_exit(255);
+ default:
+ fatal("%s: %s", __func__, ssh_err(r));
+ }
+ }
return type;
}
@@ -277,3 +289,12 @@
ssh_packet_close(active_state);
active_state = NULL;
}
+
+void
+packet_process_incoming(const char *buf, u_int len)
+{
+ int r;
+
+ if ((r = ssh_packet_process_incoming(active_state, buf, len)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
+}
diff --git a/opacket.h b/opacket.h
index 1e15626..261ed1f 100644
--- a/opacket.h
+++ b/opacket.h
@@ -44,6 +44,7 @@
void packet_set_connection(int, int);
int packet_read_seqnr(u_int32_t *);
int packet_read_poll_seqnr(u_int32_t *);
+void packet_process_incoming(const char *buf, u_int len);
#define packet_set_timeout(timeout, count) \
ssh_packet_set_timeout(active_state, (timeout), (count))
#define packet_connection_is_on_socket() \
@@ -86,8 +87,6 @@
ssh_packet_read(active_state)
#define packet_read_expect(expected_type) \
ssh_packet_read_expect(active_state, (expected_type))
-#define packet_process_incoming(buf, len) \
- ssh_packet_process_incoming(active_state, (buf), (len))
#define packet_get_int64() \
ssh_packet_get_int64(active_state)
#define packet_get_bignum(value) \
diff --git a/packet.c b/packet.c
index 2c8d8aa..eb178f1 100644
--- a/packet.c
+++ b/packet.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.c,v 1.203 2015/01/20 23:14:00 deraadt Exp $ */
+/* $OpenBSD: packet.c,v 1.204 2015/01/28 21:15:47 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -1314,26 +1314,22 @@
break;
}
}
- if (r == 0) {
- logit("Connection to %.200s timed out while "
- "waiting to read", ssh_remote_ipaddr(ssh));
- cleanup_exit(255);
- }
+ if (r == 0)
+ return SSH_ERR_CONN_TIMEOUT;
/* Read data from the socket. */
do {
cont = 0;
len = roaming_read(state->connection_in, buf,
sizeof(buf), &cont);
} while (len == 0 && cont);
- if (len == 0) {
- logit("Connection closed by %.200s",
- ssh_remote_ipaddr(ssh));
- cleanup_exit(255);
- }
+ if (len == 0)
+ return SSH_ERR_CONN_CLOSED;
if (len < 0)
- fatal("Read from socket failed: %.100s", strerror(errno));
+ return SSH_ERR_SYSTEM_ERROR;
+
/* Append it to the buffer. */
- ssh_packet_process_incoming(ssh, buf, len);
+ if ((r = ssh_packet_process_incoming(ssh, buf, len)) != 0)
+ return r;
}
free(setp);
return r;
@@ -1787,7 +1783,7 @@
* together with packet_read_poll.
*/
-void
+int
ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len)
{
struct session_state *state = ssh->state;
@@ -1797,14 +1793,15 @@
state->keep_alive_timeouts = 0; /* ?? */
if (len >= state->packet_discard) {
if ((r = ssh_packet_stop_discard(ssh)) != 0)
- fatal("%s: %s", __func__, ssh_err(r));
- cleanup_exit(255);
+ return r;
}
state->packet_discard -= len;
- return;
+ return 0;
}
if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0)
- fatal("%s: %s", __func__, ssh_err(r));
+ return r;
+
+ return 0;
}
int
diff --git a/packet.h b/packet.h
index 069af2e..8a9d0f6 100644
--- a/packet.h
+++ b/packet.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.h,v 1.64 2015/01/19 20:30:23 markus Exp $ */
+/* $OpenBSD: packet.h,v 1.65 2015/01/28 21:15:47 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -94,7 +94,7 @@
int ssh_packet_read_poll(struct ssh *);
int ssh_packet_read_poll1(struct ssh *, u_char *);
int ssh_packet_read_poll2(struct ssh *, u_char *, u_int32_t *seqnr_p);
-void ssh_packet_process_incoming(struct ssh *, const char *buf, u_int len);
+int ssh_packet_process_incoming(struct ssh *, const char *buf, u_int len);
int ssh_packet_read_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);
int ssh_packet_read_poll_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);
diff --git a/ssh-keyscan.c b/ssh-keyscan.c
index 25a257c..e59eaca 100644
--- a/ssh-keyscan.c
+++ b/ssh-keyscan.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh-keyscan.c,v 1.96 2015/01/20 23:14:00 deraadt Exp $ */
+/* $OpenBSD: ssh-keyscan.c,v 1.97 2015/01/28 21:15:47 djm Exp $ */
/*
* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
*
@@ -319,8 +319,10 @@
memset(&hints, 0, sizeof(hints));
hints.ai_family = IPv4or6;
hints.ai_socktype = SOCK_STREAM;
- if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
- fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
+ if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
+ error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
+ return -1;
+ }
for (ai = aitop; ai; ai = ai->ai_next) {
s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (s < 0) {
diff --git a/ssherr.c b/ssherr.c
index 49fbb71..0b79fbb 100644
--- a/ssherr.c
+++ b/ssherr.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssherr.c,v 1.1 2014/04/30 05:29:56 djm Exp $ */
+/* $OpenBSD: ssherr.c,v 1.2 2015/01/28 21:15:47 djm Exp $ */
/*
* Copyright (c) 2011 Damien Miller
*
@@ -125,6 +125,10 @@
return "KRL file has invalid magic number";
case SSH_ERR_KEY_REVOKED:
return "Key is revoked";
+ case SSH_ERR_CONN_CLOSED:
+ return "Connection closed";
+ case SSH_ERR_CONN_TIMEOUT:
+ return "Connection timed out";
default:
return "unknown error";
}
diff --git a/ssherr.h b/ssherr.h
index 106f786..ac5cd15 100644
--- a/ssherr.h
+++ b/ssherr.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssherr.h,v 1.1 2014/04/30 05:29:56 djm Exp $ */
+/* $OpenBSD: ssherr.h,v 1.2 2015/01/28 21:15:47 djm Exp $ */
/*
* Copyright (c) 2011 Damien Miller
*
@@ -73,6 +73,8 @@
#define SSH_ERR_BUFFER_READ_ONLY -49
#define SSH_ERR_KRL_BAD_MAGIC -50
#define SSH_ERR_KEY_REVOKED -51
+#define SSH_ERR_CONN_CLOSED -52
+#define SSH_ERR_CONN_TIMEOUT -53
/* Translate a numeric error code to a human-readable error string */
const char *ssh_err(int n);