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#include "common.hh"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <cerrno>
#include <cstring>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include "config.hh"
#include "sender_client.hh"
#include "sockutils.hh"
namespace stuff {
namespace {
long WRITE_TIMEOUT = 5;
long CONNECT_TIMEOUT = 5;
class SenderClientImpl : public SenderClient {
public:
SenderClientImpl(std::shared_ptr<Error> error)
: error_(error) {
}
bool open(const Config* config) {
if (!config) return false;
sender_ = config->get("sender", "");
if (sender_.empty()) {
if (error_) error_->error("Config missing sender");
return false;
}
sender_bin_ = config->get("sender_bin", "");
return true;
}
void send(const std::string& channel, const std::string& message) override {
struct timeval target;
gettimeofday(&target, NULL);
target.tv_sec += WRITE_TIMEOUT;
send(channel, message, &target);
}
private:
void send(const std::string& channel, const std::string& message,
const struct timeval* target) {
if (!sock_) {
if (!setup()) return;
}
uint32_t size1 = channel.size();
uint32_t size2 = message.size();
size_t pos = 0, len = 8 + size1 + size2;
size1 = htonl(size1);
size2 = htonl(size2);
while (pos < len) {
ssize_t ret;
if (pos < 4) {
size_t const avail = 4 - pos;
ret = write(sock_.get(),
reinterpret_cast<char*>(&size1) + pos, avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
} else if (pos < 4 + channel.size()) {
size_t const avail = 4 + channel.size() - pos;
ret = write(sock_.get(), channel.data() + pos - 4, avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
} else if (pos < 8 + channel.size()) {
size_t const avail = 8 + channel.size() - pos;
ret = write(sock_.get(), reinterpret_cast<char*>(&size2)
+ pos - 4 - channel.size(), avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
} else {
size_t const avail = len - pos;
ret = write(sock_.get(),
message.data() + pos - 8 - channel.size(),
avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
}
if (ret < 0) {
if (errno == EINTR) continue;
if (errno != EAGAIN && errno != EWOULDBLOCK) {
sock_.reset();
return send(channel, message);
}
}
fd_set write_set;
FD_ZERO(&write_set);
FD_SET(sock_.get(), &write_set);
while (true) {
struct timeval timeout;
if (!calc_timeout(target, &timeout)) {
timeout.tv_sec = 0;
timeout.tv_usec = 0;
}
auto ret = select(sock_.get() + 1, nullptr, &write_set, nullptr,
&timeout);
if (ret < 0 && errno == EINTR) continue;
if (ret <= 0) {
// Timeout or error
sock_.reset();
return send(channel, message);
}
break;
}
}
}
bool connect_timeout(int sock, struct sockaddr* addr, socklen_t addrlen,
const struct timeval* target) {
if (!make_nonblocking(sock)) {
error_->error("Unable to make non-blocking socket", errno);
return false;
}
while (true) {
if (connect(sock, addr, addrlen) == 0) {
return true;
}
if (errno == EINTR) continue;
if (errno != EINPROGRESS) return false;
fd_set write_set;
FD_ZERO(&write_set);
FD_SET(sock, &write_set);
while (true) {
struct timeval timeout;
if (!calc_timeout(target, &timeout)) {
timeout.tv_sec = 0;
timeout.tv_usec = 0;
}
auto ret = select(sock + 1, nullptr, &write_set, nullptr,
&timeout);
if (ret < 0) {
if (errno == EINTR) continue;
return false;
}
if (ret == 0) {
errno = ETIMEDOUT;
return false;
}
int err;
socklen_t len = sizeof(int);
if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &len)) {
return false;
}
if (err != 0) {
errno = err;
return false;
}
return true;
}
}
}
bool setup_start() {
if (sender_bin_.empty()) return false;
auto pid = fork();
if (pid < 0) {
if (error_) error_->error("Error forking", errno);
return false;
}
if (pid == 0) {
char* argv[2];
argv[0] = const_cast<char*>(sender_bin_.c_str());
argv[1] = nullptr;
_exit(execv(argv[0], argv));
} else {
int status;
auto ret = waitpid(pid, &status, 0);
if (ret == -1) {
if (error_) {
error_->error("Error waiting for sender bin", errno);
}
}
return true;
}
}
bool setup() {
struct timeval target;
gettimeofday(&target, NULL);
target.tv_sec += CONNECT_TIMEOUT;
auto pos = sender_.find(':');
if (pos != std::string::npos) {
// host:port
struct addrinfo hints, *res;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (getaddrinfo(sender_.substr(0, pos).c_str(),
sender_.substr(pos + 1).c_str(), &hints, &res)) {
if (error_) error_->error("Error resolving: " + sender_);
return false;
}
for (auto ptr = res; ptr; ptr = ptr->ai_next) {
sock_.reset(socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol));
if (!sock_) continue;
if (!connect_timeout(sock_.get(), res->ai_addr, res->ai_addrlen,
&target)) {
sock_.reset();
continue;
}
break;
}
freeaddrinfo(res);
if (!sock_) {
if (errno == ECONNREFUSED && setup_start()) {
return setup();
}
if (error_) error_->error("Socket/Connect failed", errno);
return false;
}
} else {
// socket
sock_.reset(socket(PF_LOCAL, SOCK_STREAM, 0));
if (!sock_) {
if (error_) {
error_->error("Unable to create unix socket", errno);
}
return false;
}
struct sockaddr_un name;
name.sun_family = AF_LOCAL;
strncpy(name.sun_path, sender_.c_str(), sizeof(name.sun_path));
name.sun_path[sizeof(name.sun_path) - 1] = '\0';
if (!connect_timeout(sock_.get(),
reinterpret_cast<struct sockaddr*>(&name),
SUN_LEN(&name), &target)) {
if ((errno == ECONNREFUSED ||
errno == ENOENT) && setup_start()) {
return setup();
}
if (error_) error_->error("Connect failed", errno);
sock_.reset();
return false;
}
}
return true;
}
std::string sender_;
std::string sender_bin_;
std::shared_ptr<Error> error_;
sockguard sock_;
};
} // namespace
// static
std::unique_ptr<SenderClient> SenderClient::create(
const Config* config, std::shared_ptr<Error> error) {
std::unique_ptr<SenderClientImpl> ret(new SenderClientImpl(error));
if (!ret->open(config)) return nullptr;
return std::move(ret);
}
} // namespace stuff
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