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platform_system_core
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platform_system_core/adb/services.c

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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "sysdeps.h"
#define TRACE_TAG TRACE_ADB
#include "adb.h"
#include "file_sync_service.h"
#if ADB_HOST
# ifndef HAVE_WINSOCK
# include <netinet/in.h>
# include <netdb.h>
# endif
#endif
typedef struct stinfo stinfo;
struct stinfo {
void (*func)(int fd, void *cookie);
int fd;
void *cookie;
};
void *service_bootstrap_func(void *x)
{
stinfo *sti = x;
sti->func(sti->fd, sti->cookie);
free(sti);
return 0;
}
#if ADB_HOST
ADB_MUTEX_DEFINE( dns_lock );
static void dns_service(int fd, void *cookie)
{
char *hostname = cookie;
struct hostent *hp;
unsigned zero = 0;
adb_mutex_lock(&dns_lock);
hp = gethostbyname(hostname);
if(hp == 0) {
writex(fd, &zero, 4);
} else {
writex(fd, hp->h_addr, 4);
}
adb_mutex_unlock(&dns_lock);
adb_close(fd);
}
#else
extern int recovery_mode;
static void recover_service(int s, void *cookie)
{
unsigned char buf[4096];
unsigned count = (unsigned) cookie;
int fd;
fd = adb_creat("/tmp/update", 0644);
if(fd < 0) {
adb_close(s);
return;
}
while(count > 0) {
unsigned xfer = (count > 4096) ? 4096 : count;
if(readx(s, buf, xfer)) break;
if(writex(fd, buf, xfer)) break;
count -= xfer;
}
if(count == 0) {
writex(s, "OKAY", 4);
} else {
writex(s, "FAIL", 4);
}
adb_close(fd);
adb_close(s);
fd = adb_creat("/tmp/update.begin", 0644);
adb_close(fd);
}
void restart_root_service(int fd, void *cookie)
{
char buf[100];
char value[PROPERTY_VALUE_MAX];
if (getuid() == 0) {
snprintf(buf, sizeof(buf), "adbd is already running as root\n");
writex(fd, buf, strlen(buf));
adb_close(fd);
} else {
property_get("ro.debuggable", value, "");
if (strcmp(value, "1") != 0) {
snprintf(buf, sizeof(buf), "adbd cannot run as root in production builds\n");
writex(fd, buf, strlen(buf));
return;
}
property_set("service.adb.root", "1");
snprintf(buf, sizeof(buf), "restarting adbd as root\n");
writex(fd, buf, strlen(buf));
adb_close(fd);
// quit, and init will restart us as root
sleep(1);
exit(1);
}
}
#endif
#if 0
static void echo_service(int fd, void *cookie)
{
char buf[4096];
int r;
char *p;
int c;
for(;;) {
r = read(fd, buf, 4096);
if(r == 0) goto done;
if(r < 0) {
if(errno == EINTR) continue;
else goto done;
}
c = r;
p = buf;
while(c > 0) {
r = write(fd, p, c);
if(r > 0) {
c -= r;
p += r;
continue;
}
if((r < 0) && (errno == EINTR)) continue;
goto done;
}
}
done:
close(fd);
}
#endif
static int create_service_thread(void (*func)(int, void *), void *cookie)
{
stinfo *sti;
adb_thread_t t;
int s[2];
if(adb_socketpair(s)) {
printf("cannot create service socket pair\n");
return -1;
}
sti = malloc(sizeof(stinfo));
if(sti == 0) fatal("cannot allocate stinfo");
sti->func = func;
sti->cookie = cookie;
sti->fd = s[1];
if(adb_thread_create( &t, service_bootstrap_func, sti)){
free(sti);
adb_close(s[0]);
adb_close(s[1]);
printf("cannot create service thread\n");
return -1;
}
D("service thread started, %d:%d\n",s[0], s[1]);
return s[0];
}
static int create_subprocess(const char *cmd, const char *arg0, const char *arg1)
{
#ifdef HAVE_WIN32_PROC
fprintf(stderr, "error: create_subprocess not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
return -1;
#else /* !HAVE_WIN32_PROC */
char *devname;
int ptm;
pid_t pid;
ptm = unix_open("/dev/ptmx", O_RDWR); // | O_NOCTTY);
if(ptm < 0){
printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
return -1;
}
fcntl(ptm, F_SETFD, FD_CLOEXEC);
if(grantpt(ptm) || unlockpt(ptm) ||
((devname = (char*) ptsname(ptm)) == 0)){
printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
return -1;
}
pid = fork();
if(pid < 0) {
printf("- fork failed: %s -\n", strerror(errno));
return -1;
}
if(pid == 0){
int pts;
setsid();
pts = unix_open(devname, O_RDWR);
if(pts < 0) exit(-1);
dup2(pts, 0);
dup2(pts, 1);
dup2(pts, 2);
adb_close(ptm);
execl(cmd, cmd, arg0, arg1, NULL);
fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
cmd, strerror(errno), errno);
exit(-1);
} else {
#if !ADB_HOST
// set child's OOM adjustment to zero
char text[64];
snprintf(text, sizeof text, "/proc/%d/oom_adj", pid);
int fd = adb_open(text, O_WRONLY);
if (fd >= 0) {
adb_write(fd, "0", 1);
adb_close(fd);
} else {
D("adb: unable to open %s\n", text);
}
#endif
return ptm;
}
#endif /* !HAVE_WIN32_PROC */
}
#if ADB_HOST
#define SHELL_COMMAND "/bin/sh"
#else
#define SHELL_COMMAND "/system/bin/sh"
#endif
int service_to_fd(const char *name)
{
int ret = -1;
if(!strncmp(name, "tcp:", 4)) {
int port = atoi(name + 4);
name = strchr(name + 4, ':');
if(name == 0) {
ret = socket_loopback_client(port, SOCK_STREAM);
if (ret >= 0)
disable_tcp_nagle(ret);
} else {
#if ADB_HOST
adb_mutex_lock(&dns_lock);
ret = socket_network_client(name + 1, port, SOCK_STREAM);
adb_mutex_unlock(&dns_lock);
#else
return -1;
#endif
}
#ifndef HAVE_WINSOCK /* winsock doesn't implement unix domain sockets */
} else if(!strncmp(name, "local:", 6)) {
ret = socket_local_client(name + 6,
ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
} else if(!strncmp(name, "localreserved:", 14)) {
ret = socket_local_client(name + 14,
ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
} else if(!strncmp(name, "localabstract:", 14)) {
ret = socket_local_client(name + 14,
ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
} else if(!strncmp(name, "localfilesystem:", 16)) {
ret = socket_local_client(name + 16,
ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
#endif
#if ADB_HOST
} else if(!strncmp("dns:", name, 4)){
char *n = strdup(name + 4);
if(n == 0) return -1;
ret = create_service_thread(dns_service, n);
#else /* !ADB_HOST */
} else if(!strncmp("dev:", name, 4)) {
ret = unix_open(name + 4, O_RDWR);
} else if(!strncmp(name, "framebuffer:", 12)) {
ret = create_service_thread(framebuffer_service, 0);
} else if(recovery_mode && !strncmp(name, "recover:", 8)) {
ret = create_service_thread(recover_service, (void*) atoi(name + 8));
} else if (!strncmp(name, "jdwp:", 5)) {
ret = create_jdwp_connection_fd(atoi(name+5));
} else if (!strncmp(name, "log:", 4)) {
ret = create_service_thread(log_service, get_log_file_path(name + 4));
#endif
} else if(!HOST && !strncmp(name, "shell:", 6)) {
if(name[6]) {
ret = create_subprocess(SHELL_COMMAND, "-c", name + 6);
} else {
ret = create_subprocess(SHELL_COMMAND, "-", 0);
}
#if !ADB_HOST
} else if(!strncmp(name, "sync:", 5)) {
ret = create_service_thread(file_sync_service, NULL);
} else if(!strncmp(name, "remount:", 8)) {
ret = create_service_thread(remount_service, NULL);
} else if(!strncmp(name, "root:", 5)) {
ret = create_service_thread(restart_root_service, NULL);
#endif
#if 0
} else if(!strncmp(name, "echo:", 5)){
ret = create_service_thread(echo_service, 0);
#endif
}
if (ret >= 0) {
close_on_exec(ret);
}
return ret;
}
#if ADB_HOST
struct state_info {
transport_type transport;
char* serial;
int state;
};
static void wait_for_state(int fd, void* cookie)
{
struct state_info* sinfo = cookie;
char* err = "unknown error";
D("wait_for_state %d\n", sinfo->state);
atransport *t = acquire_one_transport(sinfo->state, sinfo->transport, sinfo->serial, &err);
if(t != 0) {
writex(fd, "OKAY", 4);
} else {
sendfailmsg(fd, err);
}
if (sinfo->serial)
free(sinfo->serial);
free(sinfo);
adb_close(fd);
D("wait_for_state is done\n");
}
#endif
#if ADB_HOST
asocket* host_service_to_socket(const char* name, const char *serial)
{
if (!strcmp(name,"track-devices")) {
return create_device_tracker();
} else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
struct state_info* sinfo = malloc(sizeof(struct state_info));
if (serial)
sinfo->serial = strdup(serial);
else
sinfo->serial = NULL;
name += strlen("wait-for-");
if (!strncmp(name, "local", strlen("local"))) {
sinfo->transport = kTransportLocal;
sinfo->state = CS_DEVICE;
} else if (!strncmp(name, "usb", strlen("usb"))) {
sinfo->transport = kTransportUsb;
sinfo->state = CS_DEVICE;
} else if (!strncmp(name, "any", strlen("any"))) {
sinfo->transport = kTransportAny;
sinfo->state = CS_DEVICE;
} else {
free(sinfo);
return NULL;
}
int fd = create_service_thread(wait_for_state, sinfo);
return create_local_socket(fd);
}
return NULL;
}
#endif /* ADB_HOST */
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