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#include <alloca.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <pthread.h>
#include <string.h>
#define LOG_TAG "SocketClient"
#include <cutils/log.h>
#include <sysutils/SocketClient.h>
SocketClient::SocketClient(int socket)
: mSocket(socket)
, mPid(-1)
, mUid(-1)
, mGid(-1)
, mRefCount(1)
{
pthread_mutex_init(&mWriteMutex, NULL);
pthread_mutex_init(&mRefCountMutex, NULL);
struct ucred creds;
socklen_t szCreds = sizeof(creds);
memset(&creds, 0, szCreds);
int err = getsockopt(socket, SOL_SOCKET, SO_PEERCRED, &creds, &szCreds);
if (err == 0) {
mPid = creds.pid;
mUid = creds.uid;
mGid = creds.gid;
}
}
int SocketClient::sendMsg(int code, const char *msg, bool addErrno) {
char *buf;
const char* arg;
const char* fmt;
char tmp[1];
int len;
if (addErrno) {
fmt = "%.3d %s (%s)";
arg = strerror(errno);
} else {
fmt = "%.3d %s";
arg = NULL;
}
/* Measure length of required buffer */
len = snprintf(tmp, sizeof tmp, fmt, code, msg, arg);
/* Allocate in the stack, then write to it */
buf = (char*)alloca(len+1);
snprintf(buf, len+1, fmt, code, msg, arg);
/* Send the zero-terminated message */
return sendMsg(buf);
}
int SocketClient::sendMsg(const char *msg) {
if (mSocket < 0) {
errno = EHOSTUNREACH;
return -1;
}
// Send the message including null character
if (sendData(msg, strlen(msg) + 1) != 0) {
SLOGW("Unable to send msg '%s'", msg);
return -1;
}
return 0;
}
int SocketClient::sendData(const void* data, int len) {
int rc = 0;
const char *p = (const char*) data;
int brtw = len;
if (len == 0) {
return 0;
}
pthread_mutex_lock(&mWriteMutex);
while (brtw > 0) {
rc = write(mSocket, p, brtw);
if (rc > 0) {
p += rc;
brtw -= rc;
continue;
}
if (rc < 0 && errno == EINTR)
continue;
pthread_mutex_unlock(&mWriteMutex);
if (rc == 0) {
SLOGW("0 length write :(");
errno = EIO;
} else {
SLOGW("write error (%s)", strerror(errno));
}
return -1;
}
pthread_mutex_unlock(&mWriteMutex);
return 0;
}
void SocketClient::incRef() {
pthread_mutex_lock(&mRefCountMutex);
mRefCount++;
pthread_mutex_unlock(&mRefCountMutex);
}
void SocketClient::decRef() {
bool deleteSelf = false;
pthread_mutex_lock(&mRefCountMutex);
mRefCount--;
if (mRefCount == 0) {
deleteSelf = true;
}
pthread_mutex_unlock(&mRefCountMutex);
if (deleteSelf) {
delete this;
}
}
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