| /* Copyright (c) 2004-2007, Sara Golemon <sarag@libssh2.org> |
| * Copyright (c) 2009 by Daniel Stenberg |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, |
| * with or without modification, are permitted provided |
| * that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the |
| * following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * Neither the name of the copyright holder nor the names |
| * of any other contributors may be used to endorse or |
| * promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE |
| * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| */ |
| |
| #include "libssh2_priv.h" |
| #include <errno.h> |
| #include <fcntl.h> |
| |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| |
| #ifdef HAVE_SYS_TIME_H |
| #include <sys/time.h> |
| #endif |
| |
| #ifdef HAVE_INTTYPES_H |
| #include <inttypes.h> |
| #endif |
| |
| /* Needed for struct iovec on some platforms */ |
| #ifdef HAVE_SYS_UIO_H |
| #include <sys/uio.h> |
| #endif |
| |
| #include <sys/types.h> |
| |
| #include "transport.h" |
| #include "channel.h" |
| |
| /* |
| * libssh2_packet_queue_listener |
| * |
| * Queue a connection request for a listener |
| */ |
| static inline int |
| packet_queue_listener(LIBSSH2_SESSION * session, unsigned char *data, |
| unsigned long datalen, |
| packet_queue_listener_state_t *listen_state) |
| { |
| /* |
| * Look for a matching listener |
| */ |
| unsigned char *s = data + (sizeof("forwarded-tcpip") - 1) + 5; |
| /* 17 = packet_type(1) + channel(4) + reason(4) + descr(4) + lang(4) */ |
| unsigned long packet_len = 17 + (sizeof(FwdNotReq) - 1); |
| unsigned char *p; |
| LIBSSH2_LISTENER *listen = _libssh2_list_first(&session->listeners); |
| char failure_code = 1; /* SSH_OPEN_ADMINISTRATIVELY_PROHIBITED */ |
| int rc; |
| |
| (void) datalen; |
| |
| if (listen_state->state == libssh2_NB_state_idle) { |
| listen_state->sender_channel = _libssh2_ntohu32(s); |
| s += 4; |
| |
| listen_state->initial_window_size = _libssh2_ntohu32(s); |
| s += 4; |
| listen_state->packet_size = _libssh2_ntohu32(s); |
| s += 4; |
| |
| listen_state->host_len = _libssh2_ntohu32(s); |
| s += 4; |
| listen_state->host = s; |
| s += listen_state->host_len; |
| listen_state->port = _libssh2_ntohu32(s); |
| s += 4; |
| |
| listen_state->shost_len = _libssh2_ntohu32(s); |
| s += 4; |
| listen_state->shost = s; |
| s += listen_state->shost_len; |
| listen_state->sport = _libssh2_ntohu32(s); |
| s += 4; |
| |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "Remote received connection from %s:%ld to %s:%ld", |
| listen_state->shost, listen_state->sport, |
| listen_state->host, listen_state->port); |
| |
| listen_state->state = libssh2_NB_state_allocated; |
| } |
| |
| if (listen_state->state != libssh2_NB_state_sent) { |
| while (listen) { |
| if ((listen->port == (int) listen_state->port) && |
| (strlen(listen->host) == listen_state->host_len) && |
| (memcmp (listen->host, listen_state->host, |
| listen_state->host_len) == 0)) { |
| /* This is our listener */ |
| LIBSSH2_CHANNEL *channel = NULL; |
| listen_state->channel = NULL; |
| |
| if (listen_state->state == libssh2_NB_state_allocated) { |
| if (listen->queue_maxsize && |
| (listen->queue_maxsize <= listen->queue_size)) { |
| /* Queue is full */ |
| failure_code = 4; /* SSH_OPEN_RESOURCE_SHORTAGE */ |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "Listener queue full, ignoring"); |
| listen_state->state = libssh2_NB_state_sent; |
| break; |
| } |
| |
| channel = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_CHANNEL)); |
| if (!channel) { |
| libssh2_error(session, LIBSSH2_ERROR_ALLOC, |
| "Unable to allocate a channel for new connection", |
| 0); |
| failure_code = 4; /* SSH_OPEN_RESOURCE_SHORTAGE */ |
| listen_state->state = libssh2_NB_state_sent; |
| break; |
| } |
| memset(channel, 0, sizeof(LIBSSH2_CHANNEL)); |
| |
| channel->session = session; |
| channel->channel_type_len = sizeof("forwarded-tcpip") - 1; |
| channel->channel_type = LIBSSH2_ALLOC(session, |
| channel-> |
| channel_type_len + |
| 1); |
| if (!channel->channel_type) { |
| libssh2_error(session, LIBSSH2_ERROR_ALLOC, |
| "Unable to allocate a channel for new connection", |
| 0); |
| LIBSSH2_FREE(session, channel); |
| failure_code = 4; /* SSH_OPEN_RESOURCE_SHORTAGE */ |
| listen_state->state = libssh2_NB_state_sent; |
| break; |
| } |
| memcpy(channel->channel_type, "forwarded-tcpip", |
| channel->channel_type_len + 1); |
| |
| channel->remote.id = listen_state->sender_channel; |
| channel->remote.window_size_initial = |
| LIBSSH2_CHANNEL_WINDOW_DEFAULT; |
| channel->remote.window_size = |
| LIBSSH2_CHANNEL_WINDOW_DEFAULT; |
| channel->remote.packet_size = |
| LIBSSH2_CHANNEL_PACKET_DEFAULT; |
| |
| channel->local.id = _libssh2_channel_nextid(session); |
| channel->local.window_size_initial = |
| listen_state->initial_window_size; |
| channel->local.window_size = |
| listen_state->initial_window_size; |
| channel->local.packet_size = listen_state->packet_size; |
| |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "Connection queued: channel %lu/%lu win %lu/%lu packet %lu/%lu", |
| channel->local.id, channel->remote.id, |
| channel->local.window_size, |
| channel->remote.window_size, |
| channel->local.packet_size, |
| channel->remote.packet_size); |
| |
| p = listen_state->packet; |
| *(p++) = SSH_MSG_CHANNEL_OPEN_CONFIRMATION; |
| _libssh2_htonu32(p, channel->remote.id); |
| p += 4; |
| _libssh2_htonu32(p, channel->local.id); |
| p += 4; |
| _libssh2_htonu32(p, channel->remote.window_size_initial); |
| p += 4; |
| _libssh2_htonu32(p, channel->remote.packet_size); |
| p += 4; |
| |
| listen_state->state = libssh2_NB_state_created; |
| } |
| |
| if (listen_state->state == libssh2_NB_state_created) { |
| rc = _libssh2_transport_write(session, listen_state->packet, |
| 17); |
| if (rc == PACKET_EAGAIN) |
| return rc; |
| else if (rc) { |
| libssh2_error(session, rc, |
| "Unable to send channel " |
| "open confirmation", 0); |
| listen_state->state = libssh2_NB_state_idle; |
| return rc; |
| } |
| |
| /* Link the channel into the end of the queue list */ |
| _libssh2_list_add(&listen->queue, |
| &listen_state->channel->node); |
| listen->queue_size++; |
| |
| listen_state->state = libssh2_NB_state_idle; |
| return 0; |
| } |
| } |
| |
| listen = _libssh2_list_next(&listen->node); |
| } |
| |
| listen_state->state = libssh2_NB_state_sent; |
| } |
| |
| /* We're not listening to you */ |
| p = listen_state->packet; |
| *(p++) = SSH_MSG_CHANNEL_OPEN_FAILURE; |
| _libssh2_htonu32(p, listen_state->sender_channel); |
| p += 4; |
| _libssh2_htonu32(p, failure_code); |
| p += 4; |
| _libssh2_htonu32(p, sizeof(FwdNotReq) - 1); |
| p += 4; |
| memcpy(s, FwdNotReq, sizeof(FwdNotReq) - 1); |
| p += sizeof(FwdNotReq) - 1; |
| _libssh2_htonu32(p, 0); |
| |
| rc = _libssh2_transport_write(session, listen_state->packet, |
| packet_len); |
| if (rc == PACKET_EAGAIN) { |
| return rc; |
| } else if (rc) { |
| libssh2_error(session, rc, "Unable to send open failure", 0); |
| listen_state->state = libssh2_NB_state_idle; |
| return rc; |
| } |
| listen_state->state = libssh2_NB_state_idle; |
| return 0; |
| } |
| |
| /* |
| * packet_x11_open |
| * |
| * Accept a forwarded X11 connection |
| */ |
| static inline int |
| packet_x11_open(LIBSSH2_SESSION * session, unsigned char *data, |
| unsigned long datalen, |
| packet_x11_open_state_t *x11open_state) |
| { |
| int failure_code = 2; /* SSH_OPEN_CONNECT_FAILED */ |
| unsigned char *s = data + (sizeof("x11") - 1) + 5; |
| /* 17 = packet_type(1) + channel(4) + reason(4) + descr(4) + lang(4) */ |
| unsigned long packet_len = 17 + (sizeof(X11FwdUnAvil) - 1); |
| unsigned char *p; |
| LIBSSH2_CHANNEL *channel = x11open_state->channel; |
| int rc; |
| |
| (void) datalen; |
| |
| if (x11open_state->state == libssh2_NB_state_idle) { |
| x11open_state->sender_channel = _libssh2_ntohu32(s); |
| s += 4; |
| x11open_state->initial_window_size = _libssh2_ntohu32(s); |
| s += 4; |
| x11open_state->packet_size = _libssh2_ntohu32(s); |
| s += 4; |
| x11open_state->shost_len = _libssh2_ntohu32(s); |
| s += 4; |
| x11open_state->shost = s; |
| s += x11open_state->shost_len; |
| x11open_state->sport = _libssh2_ntohu32(s); |
| s += 4; |
| |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "X11 Connection Received from %s:%ld on channel %lu", |
| x11open_state->shost, x11open_state->sport, |
| x11open_state->sender_channel); |
| |
| x11open_state->state = libssh2_NB_state_allocated; |
| } |
| |
| if (session->x11) { |
| if (x11open_state->state == libssh2_NB_state_allocated) { |
| channel = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_CHANNEL)); |
| if (!channel) { |
| libssh2_error(session, LIBSSH2_ERROR_ALLOC, |
| "Unable to allocate a channel for new connection", |
| 0); |
| failure_code = 4; /* SSH_OPEN_RESOURCE_SHORTAGE */ |
| goto x11_exit; |
| } |
| memset(channel, 0, sizeof(LIBSSH2_CHANNEL)); |
| |
| channel->session = session; |
| channel->channel_type_len = sizeof("x11") - 1; |
| channel->channel_type = LIBSSH2_ALLOC(session, |
| channel->channel_type_len + |
| 1); |
| if (!channel->channel_type) { |
| libssh2_error(session, LIBSSH2_ERROR_ALLOC, |
| "Unable to allocate a channel for new connection", |
| 0); |
| LIBSSH2_FREE(session, channel); |
| failure_code = 4; /* SSH_OPEN_RESOURCE_SHORTAGE */ |
| goto x11_exit; |
| } |
| memcpy(channel->channel_type, "x11", |
| channel->channel_type_len + 1); |
| |
| channel->remote.id = x11open_state->sender_channel; |
| channel->remote.window_size_initial = |
| LIBSSH2_CHANNEL_WINDOW_DEFAULT; |
| channel->remote.window_size = LIBSSH2_CHANNEL_WINDOW_DEFAULT; |
| channel->remote.packet_size = LIBSSH2_CHANNEL_PACKET_DEFAULT; |
| |
| channel->local.id = _libssh2_channel_nextid(session); |
| channel->local.window_size_initial = |
| x11open_state->initial_window_size; |
| channel->local.window_size = x11open_state->initial_window_size; |
| channel->local.packet_size = x11open_state->packet_size; |
| |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "X11 Connection established: channel %lu/%lu win %lu/%lu packet %lu/%lu", |
| channel->local.id, channel->remote.id, |
| channel->local.window_size, |
| channel->remote.window_size, |
| channel->local.packet_size, |
| channel->remote.packet_size); |
| p = x11open_state->packet; |
| *(p++) = SSH_MSG_CHANNEL_OPEN_CONFIRMATION; |
| _libssh2_htonu32(p, channel->remote.id); |
| p += 4; |
| _libssh2_htonu32(p, channel->local.id); |
| p += 4; |
| _libssh2_htonu32(p, channel->remote.window_size_initial); |
| p += 4; |
| _libssh2_htonu32(p, channel->remote.packet_size); |
| p += 4; |
| |
| x11open_state->state = libssh2_NB_state_created; |
| } |
| |
| if (x11open_state->state == libssh2_NB_state_created) { |
| rc = _libssh2_transport_write(session, x11open_state->packet, 17); |
| if (rc == PACKET_EAGAIN) { |
| return rc; |
| } else if (rc) { |
| libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, |
| "Unable to send channel open confirmation", 0); |
| x11open_state->state = libssh2_NB_state_idle; |
| return -1; |
| } |
| |
| /* Link the channel into the session */ |
| _libssh2_list_add(&session->channels, &channel->node); |
| |
| /* |
| * Pass control to the callback, they may turn right around and |
| * free the channel, or actually use it |
| */ |
| LIBSSH2_X11_OPEN(channel, (char *)x11open_state->shost, |
| x11open_state->sport); |
| |
| x11open_state->state = libssh2_NB_state_idle; |
| return 0; |
| } |
| } else { |
| failure_code = 4; /* SSH_OPEN_RESOURCE_SHORTAGE */ |
| } |
| |
| x11_exit: |
| p = x11open_state->packet; |
| *(p++) = SSH_MSG_CHANNEL_OPEN_FAILURE; |
| _libssh2_htonu32(p, x11open_state->sender_channel); |
| p += 4; |
| _libssh2_htonu32(p, failure_code); |
| p += 4; |
| _libssh2_htonu32(p, sizeof(X11FwdUnAvil) - 1); |
| p += 4; |
| memcpy(s, X11FwdUnAvil, sizeof(X11FwdUnAvil) - 1); |
| p += sizeof(X11FwdUnAvil) - 1; |
| _libssh2_htonu32(p, 0); |
| |
| rc = _libssh2_transport_write(session, x11open_state->packet, packet_len); |
| if (rc == PACKET_EAGAIN) { |
| return rc; |
| } else if (rc) { |
| libssh2_error(session, rc, "Unable to send open failure", 0); |
| x11open_state->state = libssh2_NB_state_idle; |
| return rc; |
| } |
| x11open_state->state = libssh2_NB_state_idle; |
| return 0; |
| } |
| |
| /* |
| * _libssh2_packet_add |
| * |
| * Create a new packet and attach it to the brigade. Called from the transport |
| * layer when it as received a packet. |
| * |
| * The input pointer 'data' is pointing to allocated data that this function |
| * is asked to deal with so on failure OR success, it must be freed fine. |
| */ |
| int |
| _libssh2_packet_add(LIBSSH2_SESSION * session, unsigned char *data, |
| size_t datalen, int macstate) |
| { |
| int rc; |
| |
| if (session->packAdd_state == libssh2_NB_state_idle) { |
| session->packAdd_data_head = 0; |
| |
| /* Zero the whole thing out */ |
| memset(&session->packAdd_key_state, 0, |
| sizeof(session->packAdd_key_state)); |
| |
| /* Zero the whole thing out */ |
| memset(&session->packAdd_Qlstn_state, 0, |
| sizeof(session->packAdd_Qlstn_state)); |
| |
| /* Zero the whole thing out */ |
| memset(&session->packAdd_x11open_state, 0, |
| sizeof(session->packAdd_x11open_state)); |
| |
| _libssh2_debug(session, LIBSSH2_DBG_TRANS, |
| "Packet type %d received, length=%d", |
| (int) data[0], (int) datalen); |
| if (macstate == LIBSSH2_MAC_INVALID) { |
| if (session->macerror && |
| LIBSSH2_MACERROR(session, (char *) data, datalen) == 0) { |
| /* Calling app has given the OK, Process it anyway */ |
| macstate = LIBSSH2_MAC_CONFIRMED; |
| } else { |
| libssh2_error(session, LIBSSH2_ERROR_INVALID_MAC, |
| "Invalid Message Authentication Code received", |
| 0); |
| if (session->ssh_msg_disconnect) { |
| LIBSSH2_DISCONNECT(session, SSH_DISCONNECT_MAC_ERROR, |
| "Invalid MAC received", |
| sizeof("Invalid MAC received") - 1, |
| "", 0); |
| } |
| LIBSSH2_FREE(session, data); |
| return LIBSSH2_ERROR_INVALID_MAC; |
| } |
| } |
| |
| session->packAdd_state = libssh2_NB_state_allocated; |
| } |
| |
| /* |
| * =============================== NOTE =============================== |
| * I know this is very ugly and not a really good use of "goto", but |
| * this case statement would be even uglier to do it any other way |
| */ |
| if (session->packAdd_state == libssh2_NB_state_jump1) { |
| goto libssh2_packet_add_jump_point1; |
| } else if (session->packAdd_state == libssh2_NB_state_jump2) { |
| goto libssh2_packet_add_jump_point2; |
| } else if (session->packAdd_state == libssh2_NB_state_jump3) { |
| goto libssh2_packet_add_jump_point3; |
| } |
| |
| if (session->packAdd_state == libssh2_NB_state_allocated) { |
| /* A couple exceptions to the packet adding rule: */ |
| switch (data[0]) { |
| case SSH_MSG_DISCONNECT: |
| { |
| char *message, *language; |
| int reason, message_len, language_len; |
| |
| reason = _libssh2_ntohu32(data + 1); |
| message_len = _libssh2_ntohu32(data + 5); |
| /* 9 = packet_type(1) + reason(4) + message_len(4) */ |
| message = (char *) data + 9; |
| language_len = _libssh2_ntohu32(data + 9 + message_len); |
| /* |
| * This is where we hack on the data a little, |
| * Use the MSB of language_len to to a terminating NULL |
| * (In all liklihood it is already) |
| * Shift the language tag back a byte (In all likelihood |
| * it's zero length anyway) |
| * Store a NULL in the last byte of the packet to terminate |
| * the language string |
| * With the lengths passed this isn't *REALLY* necessary, |
| * but it's "kind" |
| */ |
| message[message_len] = '\0'; |
| language = (char *) data + 9 + message_len + 3; |
| if (language_len) { |
| memcpy(language, language + 1, language_len); |
| } |
| language[language_len] = '\0'; |
| |
| if (session->ssh_msg_disconnect) { |
| LIBSSH2_DISCONNECT(session, reason, message, |
| message_len, language, language_len); |
| } |
| _libssh2_debug(session, LIBSSH2_DBG_TRANS, |
| "Disconnect(%d): %s(%s)", reason, |
| message, language); |
| LIBSSH2_FREE(session, data); |
| session->socket_state = LIBSSH2_SOCKET_DISCONNECTED; |
| session->packAdd_state = libssh2_NB_state_idle; |
| libssh2_error(session, LIBSSH2_ERROR_SOCKET_DISCONNECT, |
| "socket disconnect", 0); |
| return LIBSSH2_ERROR_SOCKET_DISCONNECT; |
| } |
| break; |
| |
| case SSH_MSG_IGNORE: |
| /* As with disconnect, back it up one and add a trailing NULL */ |
| memcpy(data + 4, data + 5, datalen - 5); |
| data[datalen] = '\0'; |
| if (session->ssh_msg_ignore) { |
| LIBSSH2_IGNORE(session, (char *) data + 4, datalen - 5); |
| } |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| |
| case SSH_MSG_DEBUG: |
| { |
| int always_display = data[0]; |
| char *message, *language; |
| int message_len, language_len; |
| |
| message_len = _libssh2_ntohu32(data + 2); |
| /* 6 = packet_type(1) + display(1) + message_len(4) */ |
| message = (char *) data + 6; |
| language_len = _libssh2_ntohu32(data + 6 + message_len); |
| /* |
| * This is where we hack on the data a little, |
| * Use the MSB of language_len to to a terminating NULL |
| * (In all liklihood it is already) |
| * Shift the language tag back a byte (In all likelihood |
| * it's zero length anyway) |
| * Store a NULL in the last byte of the packet to terminate |
| * the language string |
| * With the lengths passed this isn't *REALLY* necessary, |
| * but it's "kind" |
| */ |
| message[message_len] = '\0'; |
| language = (char *) data + 6 + message_len + 3; |
| if (language_len) { |
| memcpy(language, language + 1, language_len); |
| } |
| language[language_len] = '\0'; |
| |
| if (session->ssh_msg_debug) { |
| LIBSSH2_DEBUG(session, always_display, message, |
| message_len, language, language_len); |
| } |
| /* |
| * _libssh2_debug will actually truncate this for us so |
| * that it's not an inordinate about of data |
| */ |
| _libssh2_debug(session, LIBSSH2_DBG_TRANS, |
| "Debug Packet: %s", message); |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| break; |
| |
| case SSH_MSG_CHANNEL_EXTENDED_DATA: |
| /* streamid(4) */ |
| session->packAdd_data_head += 4; |
| case SSH_MSG_CHANNEL_DATA: |
| /* packet_type(1) + channelno(4) + datalen(4) */ |
| session->packAdd_data_head += 9; |
| |
| session->packAdd_channel = |
| _libssh2_channel_locate(session, _libssh2_ntohu32(data + 1)); |
| |
| if (!session->packAdd_channel) { |
| libssh2_error(session, LIBSSH2_ERROR_CHANNEL_UNKNOWN, |
| "Packet received for unknown channel, ignoring", |
| 0); |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| #ifdef LIBSSH2DEBUG |
| { |
| unsigned long stream_id = 0; |
| if (data[0] == SSH_MSG_CHANNEL_EXTENDED_DATA) { |
| stream_id = _libssh2_ntohu32(data + 5); |
| } |
| |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "%d bytes packet_add() for %lu/%lu/%lu", |
| (int) (datalen - session->packAdd_data_head), |
| session->packAdd_channel->local.id, |
| session->packAdd_channel->remote.id, |
| stream_id); |
| } |
| #endif |
| if ((session->packAdd_channel->remote.extended_data_ignore_mode == |
| LIBSSH2_CHANNEL_EXTENDED_DATA_IGNORE) && |
| (data[0] == SSH_MSG_CHANNEL_EXTENDED_DATA)) { |
| /* Pretend we didn't receive this */ |
| LIBSSH2_FREE(session, data); |
| |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "Ignoring extended data and refunding %d bytes", |
| (int) (datalen - 13)); |
| /* Adjust the window based on the block we just freed */ |
| libssh2_packet_add_jump_point1: |
| session->packAdd_state = libssh2_NB_state_jump1; |
| rc = _libssh2_channel_receive_window_adjust(session-> |
| packAdd_channel, |
| datalen - 13, |
| 0, NULL); |
| if (rc == PACKET_EAGAIN) |
| return rc; |
| |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| |
| /* |
| * REMEMBER! remote means remote as source of data, |
| * NOT remote window! |
| */ |
| if (session->packAdd_channel->remote.packet_size < |
| (datalen - session->packAdd_data_head)) { |
| /* |
| * Spec says we MAY ignore bytes sent beyond |
| * packet_size |
| */ |
| libssh2_error(session, |
| LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, |
| "Packet contains more data than we offered" |
| " to receive, truncating", 0); |
| datalen = |
| session->packAdd_channel->remote.packet_size + |
| session->packAdd_data_head; |
| } |
| if (session->packAdd_channel->remote.window_size <= 0) { |
| /* |
| * Spec says we MAY ignore bytes sent beyond |
| * window_size |
| */ |
| libssh2_error(session, |
| LIBSSH2_ERROR_CHANNEL_WINDOW_EXCEEDED, |
| "The current receive window is full," |
| " data ignored", |
| 0); |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| /* Reset EOF status */ |
| session->packAdd_channel->remote.eof = 0; |
| |
| if ((datalen - session->packAdd_data_head) > |
| session->packAdd_channel->remote.window_size) { |
| libssh2_error(session, |
| LIBSSH2_ERROR_CHANNEL_WINDOW_EXCEEDED, |
| "Remote sent more data than current " |
| "window allows, truncating", |
| 0); |
| datalen = |
| session->packAdd_channel->remote.window_size + |
| session->packAdd_data_head; |
| } |
| else { |
| /* Now that we've received it, shrink our window */ |
| session->packAdd_channel->remote.window_size -= |
| datalen - session->packAdd_data_head; |
| } |
| |
| break; |
| |
| case SSH_MSG_CHANNEL_EOF: |
| session->packAdd_channel = |
| _libssh2_channel_locate(session, _libssh2_ntohu32(data + 1)); |
| |
| if (!session->packAdd_channel) { |
| /* We may have freed already, just quietly ignore this... */ |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| |
| _libssh2_debug(session, |
| LIBSSH2_DBG_CONN, |
| "EOF received for channel %lu/%lu", |
| session->packAdd_channel->local.id, |
| session->packAdd_channel->remote.id); |
| session->packAdd_channel->remote.eof = 1; |
| |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| |
| case SSH_MSG_CHANNEL_REQUEST: |
| if (_libssh2_ntohu32(data + 5) == sizeof("exit-status") - 1 |
| && !memcmp("exit-status", data + 9, |
| sizeof("exit-status") - 1)) { |
| |
| /* we've got "exit-status" packet. Set the session value */ |
| session->packAdd_channel = |
| _libssh2_channel_locate(session, |
| _libssh2_ntohu32(data + 1)); |
| |
| if (session->packAdd_channel) { |
| session->packAdd_channel->exit_status = |
| _libssh2_ntohu32(data + 9 + sizeof("exit-status")); |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "Exit status %lu received for channel %lu/%lu", |
| session->packAdd_channel->exit_status, |
| session->packAdd_channel->local.id, |
| session->packAdd_channel->remote.id); |
| } |
| |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| break; |
| |
| case SSH_MSG_CHANNEL_CLOSE: |
| session->packAdd_channel = |
| _libssh2_channel_locate(session, _libssh2_ntohu32(data + 1)); |
| |
| if (!session->packAdd_channel) { |
| /* We may have freed already, just quietly ignore this... */ |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "Close received for channel %lu/%lu", |
| session->packAdd_channel->local.id, |
| session->packAdd_channel->remote.id); |
| |
| session->packAdd_channel->remote.close = 1; |
| session->packAdd_channel->remote.eof = 1; |
| |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| |
| case SSH_MSG_CHANNEL_OPEN: |
| if ((datalen >= (sizeof("forwarded-tcpip") + 4)) && |
| ((sizeof("forwarded-tcpip") - 1) == _libssh2_ntohu32(data + 1)) |
| && |
| (memcmp(data + 5, "forwarded-tcpip", |
| sizeof("forwarded-tcpip") - 1) == 0)) { |
| |
| libssh2_packet_add_jump_point2: |
| session->packAdd_state = libssh2_NB_state_jump2; |
| rc = packet_queue_listener(session, data, datalen, |
| &session->packAdd_Qlstn_state); |
| if (rc == PACKET_EAGAIN) |
| return rc; |
| |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return rc; |
| } |
| if ((datalen >= (sizeof("x11") + 4)) && |
| ((sizeof("x11") - 1) == _libssh2_ntohu32(data + 1)) && |
| (memcmp(data + 5, "x11", sizeof("x11") - 1) == 0)) { |
| |
| libssh2_packet_add_jump_point3: |
| session->packAdd_state = libssh2_NB_state_jump3; |
| rc = packet_x11_open(session, data, datalen, |
| &session->packAdd_x11open_state); |
| if (rc == PACKET_EAGAIN) |
| return rc; |
| |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return rc; |
| } |
| break; |
| |
| case SSH_MSG_CHANNEL_WINDOW_ADJUST: |
| { |
| unsigned long bytestoadd = _libssh2_ntohu32(data + 5); |
| session->packAdd_channel = |
| _libssh2_channel_locate(session, |
| _libssh2_ntohu32(data + 1)); |
| |
| if (session->packAdd_channel && bytestoadd) { |
| session->packAdd_channel->local.window_size += bytestoadd; |
| } |
| _libssh2_debug(session, LIBSSH2_DBG_CONN, |
| "Window adjust received for channel %lu/%lu, adding %lu bytes, new window_size=%lu", |
| session->packAdd_channel->local.id, |
| session->packAdd_channel->remote.id, |
| bytestoadd, |
| session->packAdd_channel->local.window_size); |
| |
| LIBSSH2_FREE(session, data); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| break; |
| } |
| |
| session->packAdd_state = libssh2_NB_state_sent; |
| } |
| |
| if (session->packAdd_state == libssh2_NB_state_sent) { |
| LIBSSH2_PACKET *packAdd_packet; |
| packAdd_packet = |
| LIBSSH2_ALLOC(session, sizeof(LIBSSH2_PACKET)); |
| if (!packAdd_packet) { |
| _libssh2_debug(session, LIBSSH2_ERROR_ALLOC, |
| "Unable to allocate memory for LIBSSH2_PACKET"); |
| session->packAdd_state = libssh2_NB_state_idle; |
| return -1; |
| } |
| memset(packAdd_packet, 0, sizeof(LIBSSH2_PACKET)); |
| |
| packAdd_packet->data = data; |
| packAdd_packet->data_len = datalen; |
| packAdd_packet->data_head = session->packAdd_data_head; |
| packAdd_packet->mac = macstate; |
| |
| _libssh2_list_add(&session->packets, &packAdd_packet->node); |
| |
| session->packAdd_state = libssh2_NB_state_sent1; |
| } |
| |
| if ((data[0] == SSH_MSG_KEXINIT && |
| !(session->state & LIBSSH2_STATE_EXCHANGING_KEYS)) || |
| (session->packAdd_state == libssh2_NB_state_sent2)) { |
| if (session->packAdd_state == libssh2_NB_state_sent1) { |
| /* |
| * Remote wants new keys |
| * Well, it's already in the brigade, |
| * let's just call back into ourselves |
| */ |
| _libssh2_debug(session, LIBSSH2_DBG_TRANS, "Renegotiating Keys"); |
| |
| session->packAdd_state = libssh2_NB_state_sent2; |
| } |
| |
| /* |
| * The KEXINIT message has been added to the queue. The packAdd and |
| * readPack states need to be reset because libssh2_kex_exchange |
| * (eventually) calls upon _libssh2_transport_read to read the rest of |
| * the key exchange conversation. |
| */ |
| session->readPack_state = libssh2_NB_state_idle; |
| session->packet.total_num = 0; |
| session->packAdd_state = libssh2_NB_state_idle; |
| session->fullpacket_state = libssh2_NB_state_idle; |
| |
| /* |
| * Also, don't use packAdd_key_state for key re-exchange, |
| * as it will be wiped out in the middle of the exchange. |
| * How about re-using the startup_key_state? |
| */ |
| memset(&session->startup_key_state, 0, sizeof(key_exchange_state_t)); |
| |
| /* |
| * If there was a key reexchange failure, let's just hope we didn't |
| * send NEWKEYS yet, otherwise remote will drop us like a rock |
| */ |
| rc = libssh2_kex_exchange(session, 1, &session->startup_key_state); |
| if (rc == PACKET_EAGAIN) { |
| return rc; |
| } |
| } |
| |
| session->packAdd_state = libssh2_NB_state_idle; |
| return 0; |
| } |
| |
| /* |
| * _libssh2_packet_ask |
| * |
| * Scan the brigade for a matching packet type, optionally poll the socket for |
| * a packet first |
| */ |
| int |
| _libssh2_packet_ask(LIBSSH2_SESSION * session, unsigned char packet_type, |
| unsigned char **data, unsigned long *data_len, |
| unsigned long match_ofs, const unsigned char *match_buf, |
| unsigned long match_len) |
| { |
| LIBSSH2_PACKET *packet = _libssh2_list_first(&session->packets); |
| |
| _libssh2_debug(session, LIBSSH2_DBG_TRANS, |
| "Looking for packet of type: %d", (int) packet_type); |
| |
| while (packet) { |
| if (packet->data[0] == packet_type |
| && (packet->data_len >= (match_ofs + match_len)) |
| && (!match_buf || |
| (memcmp(packet->data + match_ofs, match_buf, |
| match_len) == 0))) { |
| *data = packet->data; |
| *data_len = packet->data_len; |
| |
| /* unlink struct from session->packets */ |
| _libssh2_list_remove(&packet->node); |
| |
| LIBSSH2_FREE(session, packet); |
| |
| return 0; |
| } |
| packet = _libssh2_list_next(&packet->node); |
| } |
| return -1; |
| } |
| |
| /* |
| * libssh2_packet_askv |
| * |
| * Scan for any of a list of packet types in the brigade, optionally poll the |
| * socket for a packet first |
| */ |
| int |
| _libssh2_packet_askv(LIBSSH2_SESSION * session, |
| const unsigned char *packet_types, |
| unsigned char **data, unsigned long *data_len, |
| unsigned long match_ofs, |
| const unsigned char *match_buf, |
| unsigned long match_len) |
| { |
| int i, packet_types_len = strlen((char *) packet_types); |
| |
| for(i = 0; i < packet_types_len; i++) { |
| if (0 == _libssh2_packet_ask(session, packet_types[i], data, |
| data_len, match_ofs, |
| match_buf, match_len)) { |
| return 0; |
| } |
| } |
| |
| return -1; |
| } |
| |
| /* |
| * _libssh2_packet_require |
| * |
| * Loops _libssh2_transport_read() until the packet requested is available |
| * SSH_DISCONNECT or a SOCKET_DISCONNECTED will cause a bailout |
| * |
| * Returns negative on error |
| * Returns 0 when it has taken care of the requested packet. |
| */ |
| int |
| _libssh2_packet_require(LIBSSH2_SESSION * session, unsigned char packet_type, |
| unsigned char **data, unsigned long *data_len, |
| unsigned long match_ofs, |
| const unsigned char *match_buf, |
| unsigned long match_len, |
| packet_require_state_t *state) |
| { |
| if (state->start == 0) { |
| if (_libssh2_packet_ask(session, packet_type, data, data_len, |
| match_ofs, match_buf, |
| match_len) == 0) { |
| /* A packet was available in the packet brigade */ |
| return 0; |
| } |
| |
| state->start = time(NULL); |
| } |
| |
| while (session->socket_state == LIBSSH2_SOCKET_CONNECTED) { |
| int ret = _libssh2_transport_read(session); |
| if (ret == PACKET_EAGAIN) |
| return ret; |
| else if (ret < 0) { |
| state->start = 0; |
| /* an error which is not just because of blocking */ |
| return ret; |
| } else if (ret == packet_type) { |
| /* Be lazy, let packet_ask pull it out of the brigade */ |
| ret = _libssh2_packet_ask(session, packet_type, data, data_len, |
| match_ofs, match_buf, match_len); |
| state->start = 0; |
| return ret; |
| } else if (ret == 0) { |
| /* nothing available, wait until data arrives or we time out */ |
| long left = LIBSSH2_READ_TIMEOUT - (long)(time(NULL) - state->start); |
| |
| if (left <= 0) { |
| state->start = 0; |
| return PACKET_TIMEOUT; |
| } |
| return -1; /* no packet available yet */ |
| } |
| } |
| |
| /* Only reached if the socket died */ |
| return LIBSSH2_ERROR_SOCKET_DISCONNECT; |
| } |
| |
| /* |
| * _libssh2_packet_burn |
| * |
| * Loops _libssh2_transport_read() until any packet is available and promptly |
| * discards it. |
| * Used during KEX exchange to discard badly guessed KEX_INIT packets |
| */ |
| int |
| _libssh2_packet_burn(LIBSSH2_SESSION * session, |
| libssh2_nonblocking_states * state) |
| { |
| unsigned char *data; |
| unsigned long data_len; |
| unsigned char all_packets[255]; |
| int i; |
| int ret; |
| |
| if (*state == libssh2_NB_state_idle) { |
| for(i = 1; i < 256; i++) { |
| all_packets[i - 1] = i; |
| } |
| |
| if (_libssh2_packet_askv(session, all_packets, &data, &data_len, 0, |
| NULL, 0) == 0) { |
| i = data[0]; |
| /* A packet was available in the packet brigade, burn it */ |
| LIBSSH2_FREE(session, data); |
| return i; |
| } |
| |
| _libssh2_debug(session, LIBSSH2_DBG_TRANS, |
| "Blocking until packet becomes available to burn"); |
| *state = libssh2_NB_state_created; |
| } |
| |
| while (session->socket_state == LIBSSH2_SOCKET_CONNECTED) { |
| ret = _libssh2_transport_read(session); |
| if (ret == PACKET_EAGAIN) { |
| return ret; |
| } else if (ret < 0) { |
| *state = libssh2_NB_state_idle; |
| return ret; |
| } else if (ret == 0) { |
| /* FIXME: this might busyloop */ |
| continue; |
| } |
| |
| /* Be lazy, let packet_ask pull it out of the brigade */ |
| if (0 == |
| _libssh2_packet_ask(session, ret, &data, &data_len, 0, NULL, 0)) { |
| /* Smoke 'em if you got 'em */ |
| LIBSSH2_FREE(session, data); |
| *state = libssh2_NB_state_idle; |
| return ret; |
| } |
| } |
| |
| /* Only reached if the socket died */ |
| return LIBSSH2_ERROR_SOCKET_DISCONNECT; |
| } |
| |
| /* |
| * _libssh2_packet_requirev |
| * |
| * Loops _libssh2_transport_read() until one of a list of packet types requested is |
| * available |
| * SSH_DISCONNECT or a SOCKET_DISCONNECTED will cause a bailout |
| * packet_types is a null terminated list of packet_type numbers |
| */ |
| |
| int |
| _libssh2_packet_requirev(LIBSSH2_SESSION * session, |
| const unsigned char *packet_types, |
| unsigned char **data, unsigned long *data_len, |
| unsigned long match_ofs, |
| const unsigned char *match_buf, |
| unsigned long match_len, |
| packet_requirev_state_t * state) |
| { |
| if (_libssh2_packet_askv(session, packet_types, data, data_len, match_ofs, |
| match_buf, match_len) == 0) { |
| /* One of the packets listed was available in the packet brigade */ |
| state->start = 0; |
| return 0; |
| } |
| |
| if (state->start == 0) { |
| state->start = time(NULL); |
| } |
| |
| while (session->socket_state != LIBSSH2_SOCKET_DISCONNECTED) { |
| int ret = _libssh2_transport_read(session); |
| if ((ret < 0) && (ret != PACKET_EAGAIN)) { |
| state->start = 0; |
| return ret; |
| } |
| if (ret <= 0) { |
| long left = LIBSSH2_READ_TIMEOUT - (long)(time(NULL) - state->start); |
| |
| if (left <= 0) { |
| state->start = 0; |
| return PACKET_TIMEOUT; |
| } |
| else if (ret == PACKET_EAGAIN) { |
| return ret; |
| } |
| } |
| |
| if (strchr((char *) packet_types, ret)) { |
| /* Be lazy, let packet_ask pull it out of the brigade */ |
| return _libssh2_packet_askv(session, packet_types, data, |
| data_len, match_ofs, match_buf, |
| match_len); |
| } |
| } |
| |
| /* Only reached if the socket died */ |
| state->start = 0; |
| return LIBSSH2_ERROR_SOCKET_DISCONNECT; |
| } |
| |
