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#include <alloca.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.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));
struct iovec vec[2];
vec[0].iov_base = (void *) buf;
vec[0].iov_len = sizeof(buf);
vec[1].iov_base = (void *) data;
vec[1].iov_len = len;
pthread_mutex_lock(&mWriteMutex);
int result = sendDataLockedv(vec, (len > 0) ? 2 : 1);
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;
char *oldresult;
if(result == NULL) {
SLOGW("malloc error (%s)", strerror(errno));
return NULL;
}
*(current++) = '"';
while (arg < end) {
switch (*arg) {
case '\\':
case '"':
*(current++) = '\\'; // fallthrough
default:
*(current++) = *(arg++);
}
}
*(current++) = '"';
*(current++) = '\0';
oldresult = result; // save pointer in case realloc fails
result = (char *)realloc(result, current-result);
return result ? result : oldresult;
}
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) {
struct iovec vec[1];
vec[0].iov_base = (void *) data;
vec[0].iov_len = len;
pthread_mutex_lock(&mWriteMutex);
int rc = sendDataLockedv(vec, 1);
pthread_mutex_unlock(&mWriteMutex);
return rc;
}
int SocketClient::sendDatav(struct iovec *iov, int iovcnt) {
pthread_mutex_lock(&mWriteMutex);
int rc = sendDataLockedv(iov, iovcnt);
pthread_mutex_unlock(&mWriteMutex);
return rc;
}
int SocketClient::sendDataLockedv(struct iovec *iov, int iovcnt) {
if (mSocket < 0) {
errno = EHOSTUNREACH;
return -1;
}
if (iovcnt <= 0) {
return 0;
}
int ret = 0;
int e = 0; // SLOGW and sigaction are not inert regarding errno
int current = 0;
struct sigaction new_action, old_action;
memset(&new_action, 0, sizeof(new_action));
new_action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &new_action, &old_action);
for (;;) {
ssize_t rc = TEMP_FAILURE_RETRY(
writev(mSocket, iov + current, iovcnt - current));
if (rc > 0) {
size_t written = rc;
while ((current < iovcnt) && (written >= iov[current].iov_len)) {
written -= iov[current].iov_len;
current++;
}
if (current == iovcnt) {
break;
}
iov[current].iov_base = (char *)iov[current].iov_base + written;
iov[current].iov_len -= written;
continue;
}
if (rc == 0) {
e = EIO;
SLOGW("0 length write :(");
} else {
e = errno;
SLOGW("write error (%s)", strerror(e));
}
ret = -1;
break;
}
sigaction(SIGPIPE, &old_action, &new_action);
if (e != 0) {
errno = e;
}
return ret;
}
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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