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#include <alloca.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <pthread.h>
#include <string.h>
#include <arpa/inet.h>
#define LOG_TAG "SocketClient"
#include <cutils/log.h>
#include <sysutils/SocketClient.h>
SocketClient::SocketClient(int socket, bool owned) {
init(socket, owned, false);
}
SocketClient::SocketClient(int socket, bool owned, bool useCmdNum) {
init(socket, owned, useCmdNum);
}
void SocketClient::init(int socket, bool owned, bool useCmdNum) {
mSocket = socket;
mSocketOwned = owned;
mUseCmdNum = useCmdNum;
pthread_mutex_init(&mWriteMutex, NULL);
pthread_mutex_init(&mRefCountMutex, NULL);
mPid = -1;
mUid = -1;
mGid = -1;
mRefCount = 1;
mCmdNum = 0;
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;
}
}
SocketClient::~SocketClient()
{
if (mSocketOwned) {
close(mSocket);
}
}
int SocketClient::sendMsg(int code, const char *msg, bool addErrno) {
return sendMsg(code, msg, addErrno, mUseCmdNum);
}
int SocketClient::sendMsg(int code, const char *msg, bool addErrno, bool useCmdNum) {
char *buf;
int ret = 0;
if (addErrno) {
if (useCmdNum) {
ret = asprintf(&buf, "%d %d %s (%s)", code, getCmdNum(), msg, strerror(errno));
} else {
ret = asprintf(&buf, "%d %s (%s)", code, msg, strerror(errno));
}
} else {
if (useCmdNum) {
ret = asprintf(&buf, "%d %d %s", code, getCmdNum(), msg);
} else {
ret = asprintf(&buf, "%d %s", code, msg);
}
}
/* Send the zero-terminated message */
if (ret != -1) {
ret = sendMsg(buf);
free(buf);
}
return ret;
}
/** send 3-digit code, null, binary-length, binary data */
int SocketClient::sendBinaryMsg(int code, const void *data, int len) {
/* 4 bytes for the code & null + 4 bytes for the len */
char buf[8];
/* Write the code */
snprintf(buf, 4, "%.3d", code);
/* Write the len */
uint32_t tmp = htonl(len);
memcpy(buf + 4, &tmp, sizeof(uint32_t));
pthread_mutex_lock(&mWriteMutex);
int result = sendDataLocked(buf, sizeof(buf));
if (result == 0 && len > 0) {
result = sendDataLocked(data, len);
}
pthread_mutex_unlock(&mWriteMutex);
return result;
}
// Sends the code (c-string null-terminated).
int SocketClient::sendCode(int code) {
char buf[4];
snprintf(buf, sizeof(buf), "%.3d", code);
return sendData(buf, sizeof(buf));
}
char *SocketClient::quoteArg(const char *arg) {
int len = strlen(arg);
char *result = (char *)malloc(len * 2 + 3);
char *current = result;
const char *end = arg + len;
*(current++) = '"';
while (arg < end) {
switch (*arg) {
case '\\':
case '"':
*(current++) = '\\'; // fallthrough
default:
*(current++) = *(arg++);
}
}
*(current++) = '"';
*(current++) = '\0';
result = (char *)realloc(result, current-result);
return result;
}
int SocketClient::sendMsg(const char *msg) {
// 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) {
pthread_mutex_lock(&mWriteMutex);
int rc = sendDataLocked(data, len);
pthread_mutex_unlock(&mWriteMutex);
return rc;
}
int SocketClient::sendDataLocked(const void *data, int len) {
int rc = 0;
const char *p = (const char*) data;
int brtw = len;
if (mSocket < 0) {
errno = EHOSTUNREACH;
return -1;
}
if (len == 0) {
return 0;
}
while (brtw > 0) {
rc = send(mSocket, p, brtw, MSG_NOSIGNAL);
if (rc > 0) {
p += rc;
brtw -= rc;
continue;
}
if (rc < 0 && errno == EINTR)
continue;
if (rc == 0) {
SLOGW("0 length write :(");
errno = EIO;
} else {
SLOGW("write error (%s)", strerror(errno));
}
return -1;
}
return 0;
}
void SocketClient::incRef() {
pthread_mutex_lock(&mRefCountMutex);
mRefCount++;
pthread_mutex_unlock(&mRefCountMutex);
}
bool SocketClient::decRef() {
bool deleteSelf = false;
pthread_mutex_lock(&mRefCountMutex);
mRefCount--;
if (mRefCount == 0) {
deleteSelf = true;
} else if (mRefCount < 0) {
SLOGE("SocketClient refcount went negative!");
}
pthread_mutex_unlock(&mRefCountMutex);
if (deleteSelf) {
delete this;
}
return deleteSelf;
}
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