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Diffstat (limited to 'libssh/messages.c')
-rw-r--r--libssh/messages.c211
1 files changed, 53 insertions, 158 deletions
diff --git a/libssh/messages.c b/libssh/messages.c
index 307fd06..7df52be 100644
--- a/libssh/messages.c
+++ b/libssh/messages.c
@@ -96,18 +96,6 @@ error:
return SSH_PACKET_USED;
}
-static int handle_unimplemented(ssh_session session) {
- if (buffer_add_u32(session->out_buffer, htonl(session->recv_seq - 1)) < 0) {
- return -1;
- }
-
- if (packet_send(session) != SSH_OK) {
- return -1;
- }
-
- return 0;
-}
-
/** @internal
* @brief Handle a SSH_MSG_MSG_USERAUTH_REQUEST packet and queue a
* SSH Message
@@ -513,57 +501,38 @@ error:
return NULL;
}
-static ssh_message handle_channel_request(ssh_session session) {
+/** @internal
+ * @brief This function parses the last end of a channel request packet,
+ * which is normally converted to a SSH message and placed on the queue.
+ * @param session SSH session.
+ * @param channel Channel the request is made on.
+ * @param packet rest of the packet to be parsed.
+ * @param request type of request.
+ * @param want_reply want_reply field from the request
+ * @returns SSH_OK or SSH_ERROR.
+ */
+int message_handle_channel_request(ssh_session session, ssh_channel channel, ssh_buffer packet,
+ const char *request, uint8_t want_reply) {
ssh_message msg = NULL;
- ssh_string type = NULL;
- char *type_c = NULL;
- uint32_t channel;
- uint8_t want_reply;
-
enter_function();
-
msg = message_new(session);
if (msg == NULL) {
ssh_set_error_oom(session);
- return NULL;
- }
-
- buffer_get_u32(session->in_buffer, &channel);
- channel = ntohl(channel);
-
- type = buffer_get_ssh_string(session->in_buffer);
- if (type == NULL) {
- ssh_set_error_oom(session);
goto error;
}
- type_c = string_to_char(type);
- if (type_c == NULL) {
- ssh_set_error_oom(session);
- goto error;
- }
- string_free(type);
-
- buffer_get_u8(session->in_buffer,&want_reply);
ssh_log(session, SSH_LOG_PACKET,
- "Received a %s channel_request for channel %d (want_reply=%hhd)",
- type_c, channel, want_reply);
+ "Received a %s channel_request for channel (%d:%d) (want_reply=%hhd)",
+ request, channel->local_channel, channel->remote_channel, want_reply);
msg->type = SSH_REQUEST_CHANNEL;
- msg->channel_request.channel = ssh_channel_from_local(session, channel);
- if (msg->channel_request.channel == NULL) {
- ssh_set_error(session, SSH_FATAL, "There are no channels with the id %u.",
- channel);
- goto error;
- }
+ msg->channel_request.channel = channel;
msg->channel_request.want_reply = want_reply;
- if (strcmp(type_c, "pty-req") == 0) {
+ if (strcmp(request, "pty-req") == 0) {
ssh_string term = NULL;
char *term_c = NULL;
- SAFE_FREE(type_c);
-
- term = buffer_get_ssh_string(session->in_buffer);
+ term = buffer_get_ssh_string(packet);
if (term == NULL) {
ssh_set_error_oom(session);
goto error;
@@ -579,51 +548,43 @@ static ssh_message handle_channel_request(ssh_session session) {
msg->channel_request.type = SSH_CHANNEL_REQUEST_PTY;
msg->channel_request.TERM = term_c;
- buffer_get_u32(session->in_buffer, &msg->channel_request.width);
- buffer_get_u32(session->in_buffer, &msg->channel_request.height);
- buffer_get_u32(session->in_buffer, &msg->channel_request.pxwidth);
- buffer_get_u32(session->in_buffer, &msg->channel_request.pxheight);
+ buffer_get_u32(packet, &msg->channel_request.width);
+ buffer_get_u32(packet, &msg->channel_request.height);
+ buffer_get_u32(packet, &msg->channel_request.pxwidth);
+ buffer_get_u32(packet, &msg->channel_request.pxheight);
msg->channel_request.width = ntohl(msg->channel_request.width);
msg->channel_request.height = ntohl(msg->channel_request.height);
msg->channel_request.pxwidth = ntohl(msg->channel_request.pxwidth);
msg->channel_request.pxheight = ntohl(msg->channel_request.pxheight);
- msg->channel_request.modes = buffer_get_ssh_string(session->in_buffer);
+ msg->channel_request.modes = buffer_get_ssh_string(packet);
if (msg->channel_request.modes == NULL) {
SAFE_FREE(term_c);
goto error;
}
-
- leave_function();
- return msg;
+ goto end;
}
- if (strcmp(type_c, "window-change") == 0) {
- SAFE_FREE(type_c);
-
+ if (strcmp(request, "window-change") == 0) {
msg->channel_request.type = SSH_CHANNEL_REQUEST_WINDOW_CHANGE;
- buffer_get_u32(session->in_buffer, &msg->channel_request.width);
- buffer_get_u32(session->in_buffer, &msg->channel_request.height);
- buffer_get_u32(session->in_buffer, &msg->channel_request.pxwidth);
- buffer_get_u32(session->in_buffer, &msg->channel_request.pxheight);
+ buffer_get_u32(packet, &msg->channel_request.width);
+ buffer_get_u32(packet, &msg->channel_request.height);
+ buffer_get_u32(packet, &msg->channel_request.pxwidth);
+ buffer_get_u32(packet, &msg->channel_request.pxheight);
msg->channel_request.width = ntohl(msg->channel_request.width);
msg->channel_request.height = ntohl(msg->channel_request.height);
msg->channel_request.pxwidth = ntohl(msg->channel_request.pxwidth);
msg->channel_request.pxheight = ntohl(msg->channel_request.pxheight);
- leave_function();
- return msg;
+ goto end;
}
- if (strcmp(type_c, "subsystem") == 0) {
+ if (strcmp(request, "subsystem") == 0) {
ssh_string subsys = NULL;
char *subsys_c = NULL;
-
- SAFE_FREE(type_c);
-
- subsys = buffer_get_ssh_string(session->in_buffer);
+ subsys = buffer_get_ssh_string(packet);
if (subsys == NULL) {
ssh_set_error_oom(session);
goto error;
@@ -639,64 +600,50 @@ static ssh_message handle_channel_request(ssh_session session) {
msg->channel_request.type = SSH_CHANNEL_REQUEST_SUBSYSTEM;
msg->channel_request.subsystem = subsys_c;
- leave_function();
- return msg;
+ goto end;
}
- if (strcmp(type_c, "shell") == 0) {
- SAFE_FREE(type_c);
+ if (strcmp(request, "shell") == 0) {
msg->channel_request.type = SSH_CHANNEL_REQUEST_SHELL;
-
- leave_function();
- return msg;
+ goto end;
}
- if (strcmp(type_c, "exec") == 0) {
+ if (strcmp(request, "exec") == 0) {
ssh_string cmd = NULL;
-
- SAFE_FREE(type_c);
-
- cmd = buffer_get_ssh_string(session->in_buffer);
+ cmd = buffer_get_ssh_string(packet);
if (cmd == NULL) {
ssh_set_error_oom(session);
goto error;
}
-
msg->channel_request.type = SSH_CHANNEL_REQUEST_EXEC;
msg->channel_request.command = string_to_char(cmd);
+ string_free(cmd);
if (msg->channel_request.command == NULL) {
- string_free(cmd);
goto error;
}
- string_free(cmd);
-
- leave_function();
- return msg;
+ goto end;
}
- if (strcmp(type_c, "env") == 0) {
+ if (strcmp(request, "env") == 0) {
ssh_string name = NULL;
ssh_string value = NULL;
-
- SAFE_FREE(type_c);
-
- name = buffer_get_ssh_string(session->in_buffer);
+ name = buffer_get_ssh_string(packet);
if (name == NULL) {
ssh_set_error_oom(session);
goto error;
}
- value = buffer_get_ssh_string(session->in_buffer);
- if (value == NULL) {
- ssh_set_error_oom(session);
- string_free(name);
- goto error;
- }
+ value = buffer_get_ssh_string(packet);
+ if (value == NULL) {
+ ssh_set_error_oom(session);
+ string_free(name);
+ goto error;
+ }
msg->channel_request.type = SSH_CHANNEL_REQUEST_ENV;
msg->channel_request.var_name = string_to_char(name);
msg->channel_request.var_value = string_to_char(value);
if (msg->channel_request.var_name == NULL ||
- msg->channel_request.var_value == NULL) {
+ msg->channel_request.var_value == NULL) {
string_free(name);
string_free(value);
goto error;
@@ -704,22 +651,19 @@ static ssh_message handle_channel_request(ssh_session session) {
string_free(name);
string_free(value);
- leave_function();
- return msg;
+ goto end;
}
msg->channel_request.type = SSH_CHANNEL_UNKNOWN;
- SAFE_FREE(type_c);
-
+end:
+ message_queue(session,msg);
leave_function();
- return msg;
+ return SSH_OK;
error:
- string_free(type);
- SAFE_FREE(type_c);
ssh_message_free(msg);
leave_function();
- return NULL;
+ return SSH_ERROR;
}
int ssh_message_channel_request_reply_success(ssh_message msg) {
@@ -751,33 +695,6 @@ int ssh_message_channel_request_reply_success(ssh_message msg) {
return SSH_OK;
}
-/* TODO this function should disapear in favor of SSH_PACKET handlers */
-ssh_message ssh_message_retrieve(ssh_session session, uint32_t packettype){
- ssh_message msg=NULL;
- enter_function();
- switch(packettype) {
- case SSH2_MSG_SERVICE_REQUEST:
-// msg=handle_service_request(session);
- break;
- case SSH2_MSG_USERAUTH_REQUEST:
-// msg = handle_userauth_request(session);
- break;
- case SSH2_MSG_CHANNEL_OPEN:
-// msg = handle_channel_request_open(session);
- break;
- case SSH2_MSG_CHANNEL_REQUEST:
- msg = handle_channel_request(session);
- break;
- default:
- if (handle_unimplemented(session) == 0) {
- ssh_set_error(session, SSH_FATAL,
- "Unhandled message %d\n", session->in_packet.type);
- }
- }
- leave_function();
- return msg;
-}
-
/** @brief Retrieves a SSH message from SSH session
* @param session SSH session
* @return The SSH message received, NULL in case of error.
@@ -794,6 +711,7 @@ ssh_message ssh_message_get(ssh_session session) {
}
msg=ssh_list_get_head(ssh_message, session->ssh_message_list);
} while(msg==NULL);
+
leave_function();
return msg;
}
@@ -859,29 +777,6 @@ void ssh_message_free(ssh_message msg){
}
/** @internal
- * @brief handle various SSH request messages and stack them for callback.
- * @param session SSH session.
- * @param user user provided value.
- * @param type packet type.
- * @param packet buffer.
- * @return SSH_PACKET_USED if a message has been created.
- * @return SSH_PACKET_NOT_USED if the packet could not be used to create a
- * message.
- */
-int message_handle(ssh_session session, void *user, uint8_t type, ssh_buffer packet){
- ssh_message msg=ssh_message_retrieve(session,type);
- ssh_log(session,SSH_LOG_PROTOCOL,"Stacking message from packet type %d",type);
- (void)user;
- (void)packet;
- if(msg){
- message_queue(session,msg);
- return SSH_PACKET_USED;
- } else {
- return SSH_PACKET_NOT_USED;
- }
-}
-
-/** @internal
* @brief adds the message to the current queue of messages to be parsed
* @param session SSH session
* @param message message to add to the queue
generated by cgit (git 2.34.1) at 2025-07-03 18:38:02 +0000