1 files changed, 239 insertions, 141 deletions

diff --git a/channels.c b/channels.c
index 0a37d1abd..61ba76dec 100644
--- a/channels.c
+++ b/channels.c
@@ -16,7 +16,7 @@
  */
 
 #include "includes.h"
-RCSID("$Id: channels.c,v 1.7 1999/11/24 13:26:22 damien Exp $");
+RCSID("$Id: channels.c,v 1.8 1999/11/25 00:54:58 damien Exp $");
 
 #include "ssh.h"
 #include "packet.h"
@@ -37,17 +37,23 @@ RCSID("$Id: channels.c,v 1.7 1999/11/24 13:26:22 damien Exp $");
 /* Max len of agent socket */
 #define MAX_SOCKET_NAME 100
 
-/* Pointer to an array containing all allocated channels.  The array is
-   dynamically extended as needed. */
+/*
+ * Pointer to an array containing all allocated channels.  The array is
+ * dynamically extended as needed.
+ */
 static Channel *channels = NULL;
 
-/* Size of the channel array.  All slots of the array must always be
-   initialized (at least the type field); unused slots are marked with
-   type SSH_CHANNEL_FREE. */
+/*
+ * Size of the channel array.  All slots of the array must always be
+ * initialized (at least the type field); unused slots are marked with type
+ * SSH_CHANNEL_FREE.
+ */
 static int channels_alloc = 0;
 
-/* Maximum file descriptor value used in any of the channels.  This is updated
-   in channel_allocate. */
+/*
+ * Maximum file descriptor value used in any of the channels.  This is
+ * updated in channel_allocate.
+ */
 static int channel_max_fd_value = 0;
 
 /* Name and directory of socket for authentication agent forwarding. */
@@ -61,15 +67,19 @@ char *x11_saved_proto = NULL;
 char *x11_saved_data = NULL;
 unsigned int x11_saved_data_len = 0;
 
-/* Fake X11 authentication data.  This is what the server will be sending
-   us; we should replace any occurrences of this by the real data. */
+/*
+ * Fake X11 authentication data.  This is what the server will be sending us;
+ * we should replace any occurrences of this by the real data.
+ */
 char *x11_fake_data = NULL;
 unsigned int x11_fake_data_len;
 
-/* Data structure for storing which hosts are permitted for forward requests.
-   The local sides of any remote forwards are stored in this array to prevent
-   a corrupt remote server from accessing arbitrary TCP/IP ports on our
-   local network (which might be behind a firewall). */
+/*
+ * Data structure for storing which hosts are permitted for forward requests.
+ * The local sides of any remote forwards are stored in this array to prevent
+ * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
+ * network (which might be behind a firewall).
+ */
 typedef struct {
         char *host;             /* Host name. */
         int port;               /* Port number. */
@@ -79,9 +89,11 @@ typedef struct {
 static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
 /* Number of permitted host/port pairs in the array. */
 static int num_permitted_opens = 0;
-/* If this is true, all opens are permitted.  This is the case on the
-   server on which we have to trust the client anyway, and the user could
-   do anything after logging in anyway. */
+/*
+ * If this is true, all opens are permitted.  This is the case on the server
+ * on which we have to trust the client anyway, and the user could do
+ * anything after logging in anyway.
+ */
 static int all_opens_permitted = 0;
 
 /* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */
@@ -95,9 +107,11 @@ channel_set_options(int hostname_in_open)
         have_hostname_in_open = hostname_in_open;
 }
 
-/* Permits opening to any host/port in SSH_MSG_PORT_OPEN.  This is usually
-   called by the server, because the user could connect to any port anyway,
-   and the server has no way to know but to trust the client anyway. */
+/*
+ * Permits opening to any host/port in SSH_MSG_PORT_OPEN.  This is usually
+ * called by the server, because the user could connect to any port anyway,
+ * and the server has no way to know but to trust the client anyway.
+ */
 
 void 
 channel_permit_all_opens()
@@ -105,8 +119,10 @@ channel_permit_all_opens()
         all_opens_permitted = 1;
 }
 
-/* Allocate a new channel object and set its type and socket.
-   This will cause remote_name to be freed. */
+/*
+ * Allocate a new channel object and set its type and socket. This will cause
+ * remote_name to be freed.
+ */
 
 int 
 channel_allocate(int type, int sock, char *remote_name)
@@ -117,6 +133,7 @@ channel_allocate(int type, int sock, char *remote_name)
         /* Update the maximum file descriptor value. */
         if (sock > channel_max_fd_value)
                 channel_max_fd_value = sock;
+        /* XXX set close-on-exec -markus */
 
         /* Do initial allocation if this is the first call. */
         if (channels_alloc == 0) {
@@ -124,9 +141,10 @@ channel_allocate(int type, int sock, char *remote_name)
                 channels = xmalloc(channels_alloc * sizeof(Channel));
                 for (i = 0; i < channels_alloc; i++)
                         channels[i].type = SSH_CHANNEL_FREE;
-
-                /* Kludge: arrange a call to channel_stop_listening if we
-                   terminate with fatal(). */
+                /*
+                 * Kludge: arrange a call to channel_stop_listening if we
+                 * terminate with fatal().
+                 */
                 fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
         }
         /* Try to find a free slot where to put the new channel. */
@@ -137,8 +155,7 @@ channel_allocate(int type, int sock, char *remote_name)
                         break;
                 }
         if (found == -1) {
-                /* There are no free slots.  Take last+1 slot and expand
-                   the array.  */
+                /* There are no free slots.  Take last+1 slot and expand the array.  */
                 found = channels_alloc;
                 channels_alloc += 10;
                 debug("channel: expanding %d", channels_alloc);
@@ -181,8 +198,10 @@ channel_free(int channel)
         }
 }
 
-/* This is called just before select() to add any bits relevant to
-   channels in the select bitmasks. */
+/*
+ * This is called just before select() to add any bits relevant to channels
+ * in the select bitmasks.
+ */
 
 void 
 channel_prepare_select(fd_set * readset, fd_set * writeset)
@@ -248,15 +267,16 @@ redo:
                         break;
 
                 case SSH_CHANNEL_X11_OPEN:
-                        /* This is a special state for X11 authentication
-                           spoofing.  An opened X11 connection (when
-                           authentication spoofing is being done) remains
-                           in this state until the first packet has been
-                           completely read.  The authentication data in
-                           that packet is then substituted by the real
-                           data if it matches the fake data, and the
-                           channel is put into normal mode. */
-
+                        /*
+                         * This is a special state for X11 authentication
+                         * spoofing.  An opened X11 connection (when
+                         * authentication spoofing is being done) remains in
+                         * this state until the first packet has been
+                         * completely read.  The authentication data in that
+                         * packet is then substituted by the real data if it
+                         * matches the fake data, and the channel is put into
+                         * normal mode.
+                         */
                         /* Check if the fixed size part of the packet is in buffer. */
                         if (buffer_len(&ch->output) < 12)
                                 break;
@@ -303,9 +323,11 @@ redo:
                                 ch->type = SSH_CHANNEL_OPEN;
                                 goto reject;
                         }
-                        /* Received authentication protocol and data match
-                           our fake data. Substitute the fake data with
-                           real data. */
+                        /*
+                         * Received authentication protocol and data match
+                         * our fake data. Substitute the fake data with real
+                         * data.
+                         */
                         memcpy(ucp + 12 + ((proto_len + 3) & ~3),
                                x11_saved_data, x11_saved_data_len);
 
@@ -314,8 +336,10 @@ redo:
                         goto redo;
 
         reject:
-                        /* We have received an X11 connection that has bad
-                           authentication information. */
+                        /*
+                         * We have received an X11 connection that has bad
+                         * authentication information.
+                         */
                         log("X11 connection rejected because of wrong authentication.\r\n");
                         buffer_clear(&ch->input);
                         buffer_clear(&ch->output);
@@ -341,8 +365,10 @@ redo:
         }
 }
 
-/* After select, perform any appropriate operations for channels which
-   have events pending. */
+/*
+ * After select, perform any appropriate operations for channels which have
+ * events pending.
+ */
 
 void 
 channel_after_select(fd_set * readset, fd_set * writeset)
@@ -381,8 +407,10 @@ channel_after_select(fd_set * readset, fd_set * writeset)
                         break;
 
                 case SSH_CHANNEL_PORT_LISTENER:
-                        /* This socket is listening for connections to a
-                           forwarded TCP/IP port. */
+                        /*
+                         * This socket is listening for connections to a
+                         * forwarded TCP/IP port.
+                         */
                         if (FD_ISSET(ch->sock, readset)) {
                                 debug("Connection to port %d forwarding to %.100s:%d requested.",
                                       ch->listening_port, ch->path, ch->host_port);
@@ -410,8 +438,10 @@ channel_after_select(fd_set * readset, fd_set * writeset)
                         break;
 
                 case SSH_CHANNEL_AUTH_SOCKET:
-                        /* This is the authentication agent socket
-                           listening for connections from clients. */
+                        /*
+                         * This is the authentication agent socket listening
+                         * for connections from clients.
+                         */
                         if (FD_ISSET(ch->sock, readset)) {
                                 int nchan;
                                 len = sizeof(addr);
@@ -429,13 +459,16 @@ channel_after_select(fd_set * readset, fd_set * writeset)
                         break;
 
                 case SSH_CHANNEL_OPEN:
-                        /* This is an open two-way communication channel.
-                           It is not of interest to us at this point what
-                           kind of data is being transmitted. */
-
-                        /* Read available incoming data and append it to
-                           buffer; shutdown socket, if read or write
-                           failes */
+                        /*
+                         * This is an open two-way communication channel. It
+                         * is not of interest to us at this point what kind
+                         * of data is being transmitted.
+                         */
+
+                        /*
+                         * Read available incoming data and append it to
+                         * buffer; shutdown socket, if read or write failes
+                         */
                         if (FD_ISSET(ch->sock, readset)) {
                                 len = read(ch->sock, buf, sizeof(buf));
                                 if (len <= 0) {
@@ -500,8 +533,7 @@ channel_output_poll()
 
         for (i = 0; i < channels_alloc; i++) {
                 ch = &channels[i];
-                /* We are only interested in channels that can have
-                   buffered incoming data. */
+                /* We are only interested in channels that can have buffered incoming data. */
                 if (ch->type != SSH_CHANNEL_OPEN &&
                     ch->type != SSH_CHANNEL_INPUT_DRAINING)
                         continue;
@@ -509,8 +541,7 @@ channel_output_poll()
                 /* Get the amount of buffered data for this channel. */
                 len = buffer_len(&ch->input);
                 if (len > 0) {
-                        /* Send some data for the other side over the
-                           secure connection. */
+                        /* Send some data for the other side over the secure connection. */
                         if (packet_is_interactive()) {
                                 if (len > 1024)
                                         len = 512;
@@ -527,17 +558,20 @@ channel_output_poll()
                 } else if (ch->istate == CHAN_INPUT_WAIT_DRAIN) {
                         if (compat13)
                                 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
-                        /* input-buffer is empty and read-socket shutdown:
-                           tell peer, that we will not send more data:
-                           send IEOF */
+                        /*
+                         * input-buffer is empty and read-socket shutdown:
+                         * tell peer, that we will not send more data: send IEOF
+                         */
                         chan_ibuf_empty(ch);
                 }
         }
 }
 
-/* This is called when a packet of type CHANNEL_DATA has just been received.
-   The message type has already been consumed, but channel number and data
-   is still there. */
+/*
+ * This is called when a packet of type CHANNEL_DATA has just been received.
+ * The message type has already been consumed, but channel number and data is
+ * still there.
+ */
 
 void 
 channel_input_data(int payload_len)
@@ -564,8 +598,10 @@ channel_input_data(int payload_len)
         xfree(data);
 }
 
-/* Returns true if no channel has too much buffered data, and false if
-   one or more channel is overfull. */
+/*
+ * Returns true if no channel has too much buffered data, and false if one or
+ * more channel is overfull.
+ */
 
 int 
 channel_not_very_much_buffered_data()
@@ -615,20 +651,27 @@ channel_input_close()
                 chan_rcvd_ieof(&channels[channel]);
                 return;
         }
-        /* Send a confirmation that we have closed the channel and no more
-           data is coming for it. */
+
+        /*
+         * Send a confirmation that we have closed the channel and no more
+         * data is coming for it.
+         */
         packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
         packet_put_int(channels[channel].remote_id);
         packet_send();
 
-        /* If the channel is in closed state, we have sent a close
-           request, and the other side will eventually respond with a
-           confirmation.  Thus, we cannot free the channel here, because
-           then there would be no-one to receive the confirmation.  The
-           channel gets freed when the confirmation arrives. */
+        /*
+         * If the channel is in closed state, we have sent a close request,
+         * and the other side will eventually respond with a confirmation.
+         * Thus, we cannot free the channel here, because then there would be
+         * no-one to receive the confirmation.  The channel gets freed when
+         * the confirmation arrives.
+         */
         if (channels[channel].type != SSH_CHANNEL_CLOSED) {
-                /* Not a closed channel - mark it as draining, which will
-                   cause it to be freed later. */
+                /*
+                 * Not a closed channel - mark it as draining, which will
+                 * cause it to be freed later.
+                 */
                 buffer_consume(&channels[channel].input,
                                buffer_len(&channels[channel].input));
                 channels[channel].type = SSH_CHANNEL_OUTPUT_DRAINING;
@@ -678,8 +721,7 @@ channel_input_open_confirmation()
         /* Get remote side's id for this channel. */
         remote_channel = packet_get_int();
 
-        /* Record the remote channel number and mark that the channel is
-           now open. */
+        /* Record the remote channel number and mark that the channel is now open. */
         channels[channel].remote_id = remote_channel;
         channels[channel].type = SSH_CHANNEL_OPEN;
 }
@@ -702,8 +744,10 @@ channel_input_open_failure()
         channel_free(channel);
 }
 
-/* Stops listening for channels, and removes any unix domain sockets that
-   we might have. */
+/*
+ * Stops listening for channels, and removes any unix domain sockets that we
+ * might have.
+ */
 
 void 
 channel_stop_listening()
@@ -727,8 +771,10 @@ channel_stop_listening()
         }
 }
 
-/* Closes the sockets of all channels.  This is used to close extra file
-   descriptors after a fork. */
+/*
+ * Closes the sockets of all channels.  This is used to close extra file
+ * descriptors after a fork.
+ */
 
 void 
 channel_close_all()
@@ -778,9 +824,11 @@ channel_still_open()
         return 0;
 }
 
-/* Returns a message describing the currently open forwarded
-   connections, suitable for sending to the client.  The message
-   contains crlf pairs for newlines. */
+/*
+ * Returns a message describing the currently open forwarded connections,
+ * suitable for sending to the client.  The message contains crlf pairs for
+ * newlines.
+ */
 
 char *
 channel_open_message()
@@ -822,16 +870,19 @@ channel_open_message()
         return cp;
 }
 
-/* Initiate forwarding of connections to local port "port" through the secure
-   channel to host:port from remote side. */
+/*
+ * Initiate forwarding of connections to local port "port" through the secure
+ * channel to host:port from remote side.
+ */
 
 void 
 channel_request_local_forwarding(int port, const char *host,
                                  int host_port)
 {
-        int ch, sock;
+        int ch, sock, on = 1;
         struct sockaddr_in sin;
         extern Options options;
+        struct linger linger;
 
         if (strlen(host) > sizeof(channels[0].path) - 1)
                 packet_disconnect("Forward host name too long.");
@@ -850,6 +901,15 @@ channel_request_local_forwarding(int port, const char *host,
                 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
         sin.sin_port = htons(port);
 
+        /*
+         * Set socket options.  We would like the socket to disappear as soon
+         * as it has been closed for whatever reason.
+         */
+        setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
+        linger.l_onoff = 1;
+        linger.l_linger = 5;
+        setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &linger, sizeof(linger));
+
         /* Bind the socket to the address. */
         if (bind(sock, (struct sockaddr *) & sin, sizeof(sin)) < 0)
                 packet_disconnect("bind: %.100s", strerror(errno));
@@ -866,8 +926,10 @@ channel_request_local_forwarding(int port, const char *host,
         channels[ch].listening_port = port;
 }
 
-/* Initiate forwarding of connections to port "port" on remote host through
-   the secure channel to host:port from local side. */
+/*
+ * Initiate forwarding of connections to port "port" on remote host through
+ * the secure channel to host:port from local side.
+ */
 
 void 
 channel_request_remote_forwarding(int port, const char *host,
@@ -890,15 +952,18 @@ channel_request_remote_forwarding(int port, const char *host,
         packet_send();
         packet_write_wait();
 
-        /* Wait for response from the remote side.  It will send a
-           disconnect message on failure, and we will never see it here. */
+        /*
+         * Wait for response from the remote side.  It will send a disconnect
+         * message on failure, and we will never see it here.
+         */
         packet_read_expect(&payload_len, SSH_SMSG_SUCCESS);
 }
 
-/* This is called after receiving CHANNEL_FORWARDING_REQUEST.  This initates
-   listening for the port, and sends back a success reply (or disconnect
-   message if there was an error).  This never returns if there was an
-   error. */
+/*
+ * This is called after receiving CHANNEL_FORWARDING_REQUEST.  This initates
+ * listening for the port, and sends back a success reply (or disconnect
+ * message if there was an error).  This never returns if there was an error.
+ */
 
 void 
 channel_input_port_forward_request(int is_root)
@@ -915,8 +980,10 @@ channel_input_port_forward_request(int is_root)
         if ((port & 0xffff) != port)
                 packet_disconnect("Requested forwarding of nonexistent port %d.", port);
 
-        /* Check that an unprivileged user is not trying to forward a
-           privileged port. */
+        /*
+         * Check that an unprivileged user is not trying to forward a
+         * privileged port.
+         */
         if (port < IPPORT_RESERVED && !is_root)
                 packet_disconnect("Requested forwarding of port %d but user is not root.",
                                   port);
@@ -928,9 +995,11 @@ channel_input_port_forward_request(int is_root)
         xfree(hostname);
 }
 
-/* This is called after receiving PORT_OPEN message.  This attempts to connect
-   to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or
-   CHANNEL_OPEN_FAILURE. */
+/*
+ * This is called after receiving PORT_OPEN message.  This attempts to
+ * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
+ * or CHANNEL_OPEN_FAILURE.
+ */
 
 void 
 channel_input_port_open(int payload_len)
@@ -951,13 +1020,16 @@ channel_input_port_open(int payload_len)
         host_port = packet_get_int();
 
         /* Get remote originator name. */
-        if (have_hostname_in_open)
+        if (have_hostname_in_open) {
                 originator_string = packet_get_string(&originator_len);
-        else
+                originator_len += 4;    /* size of packet_int */
+        } else {
                 originator_string = xstrdup("unknown (remote did not supply name)");
+                originator_len = 0;     /* no originator supplied */
+        }
 
         packet_integrity_check(payload_len,
-                               4 + 4 + host_len + 4 + 4 + originator_len,
+                               4 + 4 + host_len + 4 + originator_len,
                                SSH_MSG_PORT_OPEN);
 
         /* Check if opening that port is permitted. */
@@ -1040,9 +1112,11 @@ fail:
         packet_send();
 }
 
-/* Creates an internet domain socket for listening for X11 connections.
-   Returns a suitable value for the DISPLAY variable, or NULL if an error
-   occurs. */
+/*
+ * Creates an internet domain socket for listening for X11 connections.
+ * Returns a suitable value for the DISPLAY variable, or NULL if an error
+ * occurs.
+ */
 
 char *
 x11_create_display_inet(int screen_number)
@@ -1134,9 +1208,11 @@ connect_local_xsocket(unsigned dnr)
 }
 
 
-/* This is called when SSH_SMSG_X11_OPEN is received.  The packet contains
-   the remote channel number.  We should do whatever we want, and respond
-   with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
+/*
+ * This is called when SSH_SMSG_X11_OPEN is received.  The packet contains
+ * the remote channel number.  We should do whatever we want, and respond
+ * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
+ */
 
 void 
 x11_input_open(int payload_len)
@@ -1152,13 +1228,16 @@ x11_input_open(int payload_len)
         remote_channel = packet_get_int();
 
         /* Get remote originator name. */
-        if (have_hostname_in_open)
+        if (have_hostname_in_open) {
                 remote_host = packet_get_string(&remote_len);
-        else
+                remote_len += 4;
+        } else {
                 remote_host = xstrdup("unknown (remote did not supply name)");
+                remote_len = 0;
+        }
 
         debug("Received X11 open request.");
-        packet_integrity_check(payload_len, 4 + 4 + remote_len, SSH_SMSG_X11_OPEN);
+        packet_integrity_check(payload_len, 4 + remote_len, SSH_SMSG_X11_OPEN);
 
         /* Try to open a socket for the local X server. */
         display = getenv("DISPLAY");
@@ -1166,11 +1245,15 @@ x11_input_open(int payload_len)
                 error("DISPLAY not set.");
                 goto fail;
         }
-        /* Now we decode the value of the DISPLAY variable and make a
-           connection to the real X server. */
-
-        /* Check if it is a unix domain socket.  Unix domain displays are
-           in one of the following formats: unix:d[.s], :d[.s], ::d[.s] */
+        /*
+         * Now we decode the value of the DISPLAY variable and make a
+         * connection to the real X server.
+         */
+
+        /*
+         * Check if it is a unix domain socket.  Unix domain displays are in
+         * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
+         */
         if (strncmp(display, "unix:", 5) == 0 ||
             display[0] == ':') {
                 /* Connect to the unix domain socket. */
@@ -1187,8 +1270,10 @@ x11_input_open(int payload_len)
                 /* OK, we now have a connection to the display. */
                 goto success;
         }
-        /* Connect to an inet socket.  The DISPLAY value is supposedly
-           hostname:d[.s], where hostname may also be numeric IP address. */
+        /*
+         * Connect to an inet socket.  The DISPLAY value is supposedly
+         * hostname:d[.s], where hostname may also be numeric IP address.
+         */
         strncpy(buf, display, sizeof(buf));
         buf[sizeof(buf) - 1] = 0;
         cp = strchr(buf, ':');
@@ -1197,8 +1282,7 @@ x11_input_open(int payload_len)
                 goto fail;
         }
         *cp = 0;
-        /* buf now contains the host name.  But first we parse the display
-           number. */
+        /* buf now contains the host name.  But first we parse the display number. */
         if (sscanf(cp + 1, "%d", &display_number) != 1) {
                 error("Could not parse display number from DISPLAY: %.100s",
                       display);
@@ -1267,8 +1351,10 @@ fail:
         packet_send();
 }
 
-/* Requests forwarding of X11 connections, generates fake authentication
-   data, and enables authentication spoofing. */
+/*
+ * Requests forwarding of X11 connections, generates fake authentication
+ * data, and enables authentication spoofing.
+ */
 
 void 
 x11_request_forwarding_with_spoofing(const char *proto, const char *data)
@@ -1293,8 +1379,10 @@ x11_request_forwarding_with_spoofing(const char *proto, const char *data)
         /* Save protocol name. */
         x11_saved_proto = xstrdup(proto);
 
-        /* Extract real authentication data and generate fake data of the
-           same length. */
+        /*
+         * Extract real authentication data and generate fake data of the
+         * same length.
+         */
         x11_saved_data = xmalloc(data_len);
         x11_fake_data = xmalloc(data_len);
         for (i = 0; i < data_len; i++) {
@@ -1334,9 +1422,11 @@ auth_request_forwarding()
         packet_write_wait();
 }
 
-/* Returns the name of the forwarded authentication socket.  Returns NULL
-   if there is no forwarded authentication socket.  The returned value
-   points to a static buffer. */
+/*
+ * Returns the name of the forwarded authentication socket.  Returns NULL if
+ * there is no forwarded authentication socket.  The returned value points to
+ * a static buffer.
+ */
 
 char *
 auth_get_socket_name()
@@ -1353,8 +1443,10 @@ cleanup_socket(void)
         rmdir(channel_forwarded_auth_socket_dir);
 }
 
-/* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
-   This starts forwarding authentication requests. */
+/*
+ * This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
+ * This starts forwarding authentication requests.
+ */
 
 void 
 auth_input_request_forwarding(struct passwd * pw)
@@ -1422,14 +1514,18 @@ auth_input_open_request()
         /* Read the remote channel number from the message. */
         remch = packet_get_int();
 
-        /* Get a connection to the local authentication agent (this may
-           again get forwarded). */
+        /*
+         * Get a connection to the local authentication agent (this may again
+         * get forwarded).
+         */
         sock = ssh_get_authentication_socket();
 
-        /* If we could not connect the agent, send an error message back
-           to the server. This should never happen unless the agent dies,
-           because authentication forwarding is only enabled if we have an
-           agent. */
+        /*
+         * If we could not connect the agent, send an error message back to
+         * the server. This should never happen unless the agent dies,
+         * because authentication forwarding is only enabled if we have an
+         * agent.
+         */
         if (sock < 0) {
                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
                 packet_put_int(remch);
@@ -1438,9 +1534,11 @@ auth_input_open_request()
         }
         debug("Forwarding authentication connection.");
 
-        /* Dummy host name.  This will be freed when the channel is freed;
-           it will still be valid in the packet_put_string below since the
-           channel cannot yet be freed at that point. */
+        /*
+         * Dummy host name.  This will be freed when the channel is freed; it
+         * will still be valid in the packet_put_string below since the
+         * channel cannot yet be freed at that point.
+         */
         dummyname = xstrdup("authentication agent connection");
 
         newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname);