753 lines
20 KiB
C++
753 lines
20 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* implement the "debug-ports" and "track-debug-ports" device services */
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#define TRACE_TAG TRACE_JDWP
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#include "sysdeps.h"
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "adb.h"
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/* here's how these things work.
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when adbd starts, it creates a unix server socket
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named @vm-debug-control (@ is a shortcut for "first byte is zero"
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to use the private namespace instead of the file system)
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when a new JDWP daemon thread starts in a new VM process, it creates
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a connection to @vm-debug-control to announce its availability.
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JDWP thread @vm-debug-control
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| |
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|-------------------------------> |
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| hello I'm in process <pid> |
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| |
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the connection is kept alive. it will be closed automatically if
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the JDWP process terminates (this allows adbd to detect dead
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processes).
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adbd thus maintains a list of "active" JDWP processes. it can send
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its content to clients through the "device:debug-ports" service,
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or even updates through the "device:track-debug-ports" service.
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when a debugger wants to connect, it simply runs the command
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equivalent to "adb forward tcp:<hostport> jdwp:<pid>"
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"jdwp:<pid>" is a new forward destination format used to target
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a given JDWP process on the device. when sutch a request arrives,
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adbd does the following:
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- first, it calls socketpair() to create a pair of equivalent
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sockets.
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- it attaches the first socket in the pair to a local socket
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which is itself attached to the transport's remote socket:
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- it sends the file descriptor of the second socket directly
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to the JDWP process with the help of sendmsg()
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JDWP thread @vm-debug-control
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| |
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| <----------------------|
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| OK, try this file descriptor |
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| |
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then, the JDWP thread uses this new socket descriptor as its
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pass-through connection to the debugger (and receives the
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JDWP-Handshake message, answers to it, etc...)
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this gives the following graphics:
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____________________________________
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| ADB Server (host) |
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Debugger <---> LocalSocket <----> RemoteSocket |
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| ^^ |
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|___________________________||_______|
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||
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Transport ||
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(TCP for emulator - USB for device) ||
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||
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___________________________||_______
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| || |
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| ADBD (device) || |
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| VV |
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JDWP <======> LocalSocket <----> RemoteSocket |
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| |
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|____________________________________|
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due to the way adb works, this doesn't need a special socket
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type or fancy handling of socket termination if either the debugger
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or the JDWP process closes the connection.
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THIS IS THE SIMPLEST IMPLEMENTATION I COULD FIND, IF YOU HAPPEN
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TO HAVE A BETTER IDEA, LET ME KNOW - Digit
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**********************************************************************/
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/** JDWP PID List Support Code
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** for each JDWP process, we record its pid and its connected socket
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**/
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#define MAX_OUT_FDS 4
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#if !ADB_HOST
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#include <sys/socket.h>
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#include <sys/un.h>
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struct JdwpProcess {
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JdwpProcess* next;
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JdwpProcess* prev;
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int pid;
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int socket;
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fdevent* fde;
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char in_buff[4]; /* input character to read PID */
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int in_len; /* number from JDWP process */
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int out_fds[MAX_OUT_FDS]; /* output array of file descriptors */
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int out_count; /* to send to the JDWP process */
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};
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static JdwpProcess _jdwp_list;
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static int
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jdwp_process_list( char* buffer, int bufferlen )
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{
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char* end = buffer + bufferlen;
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char* p = buffer;
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JdwpProcess* proc = _jdwp_list.next;
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for ( ; proc != &_jdwp_list; proc = proc->next ) {
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int len;
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/* skip transient connections */
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if (proc->pid < 0)
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continue;
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len = snprintf(p, end-p, "%d\n", proc->pid);
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if (p + len >= end)
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break;
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p += len;
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}
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p[0] = 0;
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return (p - buffer);
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}
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static int
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jdwp_process_list_msg( char* buffer, int bufferlen )
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{
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char head[5];
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int len = jdwp_process_list( buffer+4, bufferlen-4 );
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snprintf(head, sizeof head, "%04x", len);
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memcpy(buffer, head, 4);
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return len + 4;
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}
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static void jdwp_process_list_updated(void);
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static void
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jdwp_process_free( JdwpProcess* proc )
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{
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if (proc) {
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int n;
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proc->prev->next = proc->next;
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proc->next->prev = proc->prev;
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if (proc->socket >= 0) {
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adb_shutdown(proc->socket);
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adb_close(proc->socket);
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proc->socket = -1;
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}
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if (proc->fde != NULL) {
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fdevent_destroy(proc->fde);
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proc->fde = NULL;
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}
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proc->pid = -1;
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for (n = 0; n < proc->out_count; n++) {
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adb_close(proc->out_fds[n]);
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}
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proc->out_count = 0;
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free(proc);
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jdwp_process_list_updated();
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}
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}
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static void jdwp_process_event(int, unsigned, void*); /* forward */
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static JdwpProcess*
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jdwp_process_alloc( int socket )
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{
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JdwpProcess* proc = reinterpret_cast<JdwpProcess*>(
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calloc(1, sizeof(*proc)));
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if (proc == NULL) {
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D("not enough memory to create new JDWP process\n");
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return NULL;
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}
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proc->socket = socket;
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proc->pid = -1;
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proc->next = proc;
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proc->prev = proc;
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proc->fde = fdevent_create( socket, jdwp_process_event, proc );
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if (proc->fde == NULL) {
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D("could not create fdevent for new JDWP process\n" );
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free(proc);
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return NULL;
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}
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proc->fde->state |= FDE_DONT_CLOSE;
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proc->in_len = 0;
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proc->out_count = 0;
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/* append to list */
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proc->next = &_jdwp_list;
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proc->prev = proc->next->prev;
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proc->prev->next = proc;
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proc->next->prev = proc;
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/* start by waiting for the PID */
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fdevent_add(proc->fde, FDE_READ);
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return proc;
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}
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static void
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jdwp_process_event( int socket, unsigned events, void* _proc )
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{
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JdwpProcess* proc = reinterpret_cast<JdwpProcess*>(_proc);
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if (events & FDE_READ) {
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if (proc->pid < 0) {
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/* read the PID as a 4-hexchar string */
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char* p = proc->in_buff + proc->in_len;
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int size = 4 - proc->in_len;
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char temp[5];
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while (size > 0) {
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int len = recv( socket, p, size, 0 );
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if (len < 0) {
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if (errno == EINTR)
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continue;
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if (errno == EAGAIN)
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return;
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/* this can fail here if the JDWP process crashes very fast */
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D("weird unknown JDWP process failure: %s\n",
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strerror(errno));
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goto CloseProcess;
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}
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if (len == 0) { /* end of stream ? */
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D("weird end-of-stream from unknown JDWP process\n");
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goto CloseProcess;
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}
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p += len;
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proc->in_len += len;
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size -= len;
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}
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/* we have read 4 characters, now decode the pid */
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memcpy(temp, proc->in_buff, 4);
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temp[4] = 0;
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if (sscanf( temp, "%04x", &proc->pid ) != 1) {
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D("could not decode JDWP %p PID number: '%s'\n", proc, temp);
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goto CloseProcess;
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}
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/* all is well, keep reading to detect connection closure */
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D("Adding pid %d to jdwp process list\n", proc->pid);
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jdwp_process_list_updated();
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}
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else
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{
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/* the pid was read, if we get there it's probably because the connection
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* was closed (e.g. the JDWP process exited or crashed) */
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char buf[32];
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for (;;) {
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int len = recv(socket, buf, sizeof(buf), 0);
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if (len <= 0) {
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if (len < 0 && errno == EINTR)
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continue;
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if (len < 0 && errno == EAGAIN)
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return;
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else {
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D("terminating JDWP %d connection: %s\n", proc->pid,
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strerror(errno));
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break;
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}
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}
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else {
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D( "ignoring unexpected JDWP %d control socket activity (%d bytes)\n",
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proc->pid, len );
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}
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}
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CloseProcess:
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if (proc->pid >= 0)
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D( "remove pid %d to jdwp process list\n", proc->pid );
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jdwp_process_free(proc);
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return;
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}
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}
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if (events & FDE_WRITE) {
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D("trying to write to JDWP pid controli (count=%d first=%d) %d\n",
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proc->pid, proc->out_count, proc->out_fds[0]);
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if (proc->out_count > 0) {
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int fd = proc->out_fds[0];
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int n, ret;
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struct cmsghdr* cmsg;
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struct msghdr msg;
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struct iovec iov;
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char dummy = '!';
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char buffer[sizeof(struct cmsghdr) + sizeof(int)];
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int flags;
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iov.iov_base = &dummy;
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iov.iov_len = 1;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_flags = 0;
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msg.msg_control = buffer;
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msg.msg_controllen = sizeof(buffer);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_len = msg.msg_controllen;
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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((int*)CMSG_DATA(cmsg))[0] = fd;
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flags = fcntl(proc->socket,F_GETFL,0);
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if (flags == -1) {
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D("failed to get cntl flags for socket %d: %s\n",
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proc->pid, strerror(errno));
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goto CloseProcess;
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}
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if (fcntl(proc->socket, F_SETFL, flags & ~O_NONBLOCK) == -1) {
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D("failed to remove O_NONBLOCK flag for socket %d: %s\n",
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proc->pid, strerror(errno));
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goto CloseProcess;
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}
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for (;;) {
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ret = sendmsg(proc->socket, &msg, 0);
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if (ret >= 0) {
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adb_close(fd);
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break;
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}
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if (errno == EINTR)
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continue;
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D("sending new file descriptor to JDWP %d failed: %s\n",
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proc->pid, strerror(errno));
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goto CloseProcess;
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}
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D("sent file descriptor %d to JDWP process %d\n",
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fd, proc->pid);
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for (n = 1; n < proc->out_count; n++)
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proc->out_fds[n-1] = proc->out_fds[n];
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if (fcntl(proc->socket, F_SETFL, flags) == -1) {
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D("failed to set O_NONBLOCK flag for socket %d: %s\n",
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proc->pid, strerror(errno));
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goto CloseProcess;
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}
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if (--proc->out_count == 0)
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fdevent_del( proc->fde, FDE_WRITE );
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}
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}
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}
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int
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create_jdwp_connection_fd(int pid)
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{
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JdwpProcess* proc = _jdwp_list.next;
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D("looking for pid %d in JDWP process list\n", pid);
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for ( ; proc != &_jdwp_list; proc = proc->next ) {
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if (proc->pid == pid) {
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goto FoundIt;
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}
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}
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D("search failed !!\n");
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return -1;
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FoundIt:
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{
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int fds[2];
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if (proc->out_count >= MAX_OUT_FDS) {
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D("%s: too many pending JDWP connection for pid %d\n",
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__FUNCTION__, pid);
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return -1;
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}
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if (adb_socketpair(fds) < 0) {
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D("%s: socket pair creation failed: %s\n",
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__FUNCTION__, strerror(errno));
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return -1;
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}
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D("socketpair: (%d,%d)", fds[0], fds[1]);
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proc->out_fds[ proc->out_count ] = fds[1];
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if (++proc->out_count == 1)
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fdevent_add( proc->fde, FDE_WRITE );
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return fds[0];
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}
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}
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/** VM DEBUG CONTROL SOCKET
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**
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** we do implement a custom asocket to receive the data
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**/
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/* name of the debug control Unix socket */
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#define JDWP_CONTROL_NAME "\0jdwp-control"
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#define JDWP_CONTROL_NAME_LEN (sizeof(JDWP_CONTROL_NAME)-1)
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struct JdwpControl {
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int listen_socket;
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fdevent* fde;
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};
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static void
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jdwp_control_event(int s, unsigned events, void* user);
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static int
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jdwp_control_init( JdwpControl* control,
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const char* sockname,
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int socknamelen )
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{
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struct sockaddr_un addr;
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socklen_t addrlen;
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int s;
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int maxpath = sizeof(addr.sun_path);
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int pathlen = socknamelen;
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if (pathlen >= maxpath) {
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D( "vm debug control socket name too long (%d extra chars)\n",
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pathlen+1-maxpath );
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return -1;
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}
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memset(&addr, 0, sizeof(addr));
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addr.sun_family = AF_UNIX;
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memcpy(addr.sun_path, sockname, socknamelen);
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s = socket( AF_UNIX, SOCK_STREAM, 0 );
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if (s < 0) {
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D( "could not create vm debug control socket. %d: %s\n",
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errno, strerror(errno));
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return -1;
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}
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addrlen = (pathlen + sizeof(addr.sun_family));
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if (bind(s, (struct sockaddr*)&addr, addrlen) < 0) {
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D( "could not bind vm debug control socket: %d: %s\n",
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errno, strerror(errno) );
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adb_close(s);
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return -1;
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}
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if ( listen(s, 4) < 0 ) {
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D("listen failed in jdwp control socket: %d: %s\n",
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errno, strerror(errno));
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adb_close(s);
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return -1;
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}
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control->listen_socket = s;
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control->fde = fdevent_create(s, jdwp_control_event, control);
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if (control->fde == NULL) {
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D( "could not create fdevent for jdwp control socket\n" );
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adb_close(s);
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return -1;
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}
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/* only wait for incoming connections */
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fdevent_add(control->fde, FDE_READ);
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close_on_exec(s);
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D("jdwp control socket started (%d)\n", control->listen_socket);
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return 0;
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}
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static void
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jdwp_control_event( int s, unsigned events, void* _control )
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{
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JdwpControl* control = (JdwpControl*) _control;
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if (events & FDE_READ) {
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struct sockaddr addr;
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socklen_t addrlen = sizeof(addr);
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int s = -1;
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JdwpProcess* proc;
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do {
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s = adb_socket_accept( control->listen_socket, &addr, &addrlen );
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if (s < 0) {
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if (errno == EINTR)
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continue;
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if (errno == ECONNABORTED) {
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/* oops, the JDWP process died really quick */
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D("oops, the JDWP process died really quick\n");
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return;
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}
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/* the socket is probably closed ? */
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D( "weird accept() failed on jdwp control socket: %s\n",
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strerror(errno) );
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return;
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}
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}
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while (s < 0);
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proc = jdwp_process_alloc( s );
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if (proc == NULL)
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return;
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}
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}
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static JdwpControl _jdwp_control;
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/** "jdwp" local service implementation
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** this simply returns the list of known JDWP process pids
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**/
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struct JdwpSocket {
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asocket socket;
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int pass;
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};
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static void
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jdwp_socket_close( asocket* s )
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{
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asocket* peer = s->peer;
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remove_socket(s);
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if (peer) {
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peer->peer = NULL;
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peer->close(peer);
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}
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free(s);
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}
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static int
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jdwp_socket_enqueue( asocket* s, apacket* p )
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{
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/* you can't write to this asocket */
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put_apacket(p);
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s->peer->close(s->peer);
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return -1;
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}
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static void
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jdwp_socket_ready( asocket* s )
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{
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JdwpSocket* jdwp = (JdwpSocket*)s;
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asocket* peer = jdwp->socket.peer;
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/* on the first call, send the list of pids,
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* on the second one, close the connection
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*/
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if (jdwp->pass == 0) {
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apacket* p = get_apacket();
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p->len = jdwp_process_list((char*)p->data, MAX_PAYLOAD);
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peer->enqueue(peer, p);
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jdwp->pass = 1;
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}
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else {
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peer->close(peer);
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}
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}
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asocket*
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create_jdwp_service_socket( void )
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{
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JdwpSocket* s = reinterpret_cast<JdwpSocket*>(calloc(sizeof(*s), 1));
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if (s == NULL)
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return NULL;
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install_local_socket(&s->socket);
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s->socket.ready = jdwp_socket_ready;
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s->socket.enqueue = jdwp_socket_enqueue;
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s->socket.close = jdwp_socket_close;
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s->pass = 0;
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return &s->socket;
|
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}
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|
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/** "track-jdwp" local service implementation
|
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** this periodically sends the list of known JDWP process pids
|
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** to the client...
|
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**/
|
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|
|
struct JdwpTracker {
|
|
asocket socket;
|
|
JdwpTracker* next;
|
|
JdwpTracker* prev;
|
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int need_update;
|
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};
|
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|
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static JdwpTracker _jdwp_trackers_list;
|
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|
|
|
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static void
|
|
jdwp_process_list_updated(void)
|
|
{
|
|
char buffer[1024];
|
|
int len;
|
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JdwpTracker* t = _jdwp_trackers_list.next;
|
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|
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len = jdwp_process_list_msg(buffer, sizeof(buffer));
|
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for ( ; t != &_jdwp_trackers_list; t = t->next ) {
|
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apacket* p = get_apacket();
|
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asocket* peer = t->socket.peer;
|
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memcpy(p->data, buffer, len);
|
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p->len = len;
|
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peer->enqueue( peer, p );
|
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}
|
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}
|
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|
|
static void
|
|
jdwp_tracker_close( asocket* s )
|
|
{
|
|
JdwpTracker* tracker = (JdwpTracker*) s;
|
|
asocket* peer = s->peer;
|
|
|
|
if (peer) {
|
|
peer->peer = NULL;
|
|
peer->close(peer);
|
|
}
|
|
|
|
remove_socket(s);
|
|
|
|
tracker->prev->next = tracker->next;
|
|
tracker->next->prev = tracker->prev;
|
|
|
|
free(s);
|
|
}
|
|
|
|
static void
|
|
jdwp_tracker_ready( asocket* s )
|
|
{
|
|
JdwpTracker* t = (JdwpTracker*) s;
|
|
|
|
if (t->need_update) {
|
|
apacket* p = get_apacket();
|
|
t->need_update = 0;
|
|
p->len = jdwp_process_list_msg((char*)p->data, sizeof(p->data));
|
|
s->peer->enqueue(s->peer, p);
|
|
}
|
|
}
|
|
|
|
static int
|
|
jdwp_tracker_enqueue( asocket* s, apacket* p )
|
|
{
|
|
/* you can't write to this socket */
|
|
put_apacket(p);
|
|
s->peer->close(s->peer);
|
|
return -1;
|
|
}
|
|
|
|
|
|
asocket*
|
|
create_jdwp_tracker_service_socket( void )
|
|
{
|
|
JdwpTracker* t = reinterpret_cast<JdwpTracker*>(calloc(sizeof(*t), 1));
|
|
|
|
if (t == NULL)
|
|
return NULL;
|
|
|
|
t->next = &_jdwp_trackers_list;
|
|
t->prev = t->next->prev;
|
|
|
|
t->next->prev = t;
|
|
t->prev->next = t;
|
|
|
|
install_local_socket(&t->socket);
|
|
|
|
t->socket.ready = jdwp_tracker_ready;
|
|
t->socket.enqueue = jdwp_tracker_enqueue;
|
|
t->socket.close = jdwp_tracker_close;
|
|
t->need_update = 1;
|
|
|
|
return &t->socket;
|
|
}
|
|
|
|
|
|
int
|
|
init_jdwp(void)
|
|
{
|
|
_jdwp_list.next = &_jdwp_list;
|
|
_jdwp_list.prev = &_jdwp_list;
|
|
|
|
_jdwp_trackers_list.next = &_jdwp_trackers_list;
|
|
_jdwp_trackers_list.prev = &_jdwp_trackers_list;
|
|
|
|
return jdwp_control_init( &_jdwp_control,
|
|
JDWP_CONTROL_NAME,
|
|
JDWP_CONTROL_NAME_LEN );
|
|
}
|
|
|
|
#endif /* !ADB_HOST */
|