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Improve channel_open().

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git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@673 7dcaeef0-15fb-0310-b436-a5af3365683c
This commit is contained in:
Andreas Schneider
2009-05-02 20:41:21 +00:00
parent f0b14c7b7a
commit c31893d246
1 changed files with 111 additions and 92 deletions
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113
libssh/channels.c
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@@ -108,44 +108,43 @@ static int channel_open(CHANNEL *channel, const char *type_c, int window,
int maxpacket, BUFFER *payload) {
SSH_SESSION *session = channel->session;
STRING *type = NULL;
u32 foo;
int err;
u32 tmp = 0;
enter_function();
channel->local_channel = ssh_channel_new_id(session);
channel->local_maxpacket = maxpacket;
channel->local_window = window;
ssh_log(session, SSH_LOG_RARE,
"creating a channel %d with %d window and %d max packet",
"Creating a channel %d with %d window and %d max packet",
channel->local_channel, window, maxpacket);
type = string_from_char(type_c);
if (type == NULL) {
goto error;
leave_function();
return -1;
}
if (buffer_add_u8(session->out_buffer, SSH2_MSG_CHANNEL_OPEN) < 0) {
goto error;
}
if (buffer_add_ssh_string(session->out_buffer,type) < 0) {
goto error;
}
if (buffer_add_u32(session->out_buffer, htonl(channel->local_channel)) < 0) {
goto error;
}
if (buffer_add_u32(session->out_buffer, htonl(channel->local_window)) < 0) {
goto error;
}
if (buffer_add_u32(session->out_buffer, htonl(channel->local_maxpacket)) < 0) {
goto error;
if (buffer_add_u8(session->out_buffer, SSH2_MSG_CHANNEL_OPEN) < 0 ||
buffer_add_ssh_string(session->out_buffer,type) < 0 ||
buffer_add_u32(session->out_buffer, htonl(channel->local_channel)) < 0 ||
buffer_add_u32(session->out_buffer, htonl(channel->local_window)) < 0 ||
buffer_add_u32(session->out_buffer, htonl(channel->local_maxpacket)) < 0) {
string_free(type);
leave_function();
return -1;
}
string_free(type);
if (payload) {
if (payload != NULL) {
if (buffer_add_buffer(session->out_buffer, payload) < 0) {
goto error;
leave_function();
return -1;
}
}
if (packet_send(session) != SSH_OK) {
leave_function();
return -1;
@@ -154,22 +153,33 @@ static int channel_open(CHANNEL *channel, const char *type_c, int window,
ssh_log(session, SSH_LOG_RARE,
"Sent a SSH_MSG_CHANNEL_OPEN type %s for channel %d",
type_c, channel->local_channel);
err=packet_wait(session,SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,1);
switch(session->in_packet.type){
case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
buffer_get_u32(session->in_buffer,&foo);
if(channel->local_channel!=ntohl(foo)){
ssh_set_error(session,SSH_FATAL,"server answered with sender chan num %d instead of given %d",
ntohl(foo),channel->local_channel);
if (packet_wait(session, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, 1) != SSH_OK) {
leave_function();
return -1;
}
buffer_get_u32(session->in_buffer,&foo);
channel->remote_channel=ntohl(foo);
buffer_get_u32(session->in_buffer,&foo);
channel->remote_window=ntohl(foo);
buffer_get_u32(session->in_buffer,&foo);
channel->remote_maxpacket=ntohl(foo);
switch(session->in_packet.type) {
case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
buffer_get_u32(session->in_buffer, &tmp);
if (channel->local_channel != ntohl(tmp)) {
ssh_set_error(session, SSH_FATAL,
"Server answered with sender channel number %d instead of given %d",
ntohl(tmp),
channel->local_channel);
leave_function();
return -1;
}
buffer_get_u32(session->in_buffer, &tmp);
channel->remote_channel = ntohl(tmp);
buffer_get_u32(session->in_buffer, &tmp);
channel->remote_window = ntohl(tmp);
buffer_get_u32(session->in_buffer,&tmp);
channel->remote_maxpacket=ntohl(tmp);
ssh_log(session, SSH_LOG_PROTOCOL,
"Received a CHANNEL_OPEN_CONFIRMATION for channel %d:%d",
channel->local_channel,
@@ -178,34 +188,43 @@ static int channel_open(CHANNEL *channel, const char *type_c, int window,
"Remote window : %lu, maxpacket : %lu",
(long unsigned int) channel->remote_window,
(long unsigned int) channel->remote_maxpacket);
channel->open = 1;
leave_function();
return 0;
case SSH2_MSG_CHANNEL_OPEN_FAILURE:
{
u32 code;
STRING *error_s;
char *error;
buffer_get_u32(session->in_buffer,&foo);
u32 code;
buffer_get_u32(session->in_buffer, &tmp);
buffer_get_u32(session->in_buffer, &code);
error_s = buffer_get_ssh_string(session->in_buffer);
error = string_to_char(error_s);
ssh_set_error(session,SSH_REQUEST_DENIED,"Channel opening failure : channel %d error (%d) %s",
channel->local_channel,ntohl(code),error);
free(error);
free(error_s);
leave_function();
return -1;
}
default:
ssh_set_error(session,SSH_FATAL,"Received unknown packet %d\n",session->in_packet.type);
string_free(error_s);
if (error == NULL) {
leave_function();
return -1;
}
error:
buffer_free(session->out_buffer);
string_free(type);
ssh_set_error(session, SSH_REQUEST_DENIED,
"Channel opening failure: channel %d error (%d) %s",
channel->local_channel,
ntohl(code),
error);
SAFE_FREE(error);
leave_function();
return -1;
}
default:
ssh_set_error(session, SSH_FATAL,
"Received unknown packet %d\n", session->in_packet.type);
leave_function();
return -1;
}
leave_function();
return -1;