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#include "net.hh"
#include <charconv>
#include <cerrno>
#include <cstring>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
namespace net {
std::vector<unique_fd> bind_and_listen(
Logger* logger, std::string const& host, uint16_t port) {
std::vector<unique_fd> fds;
std::string service;
service.resize(10);
{
auto [ptr, err] = std::to_chars(service.data(),
service.data() + service.size(), port);
if (err != std::errc{}) {
logger->err("Invalid port: %u", static_cast<unsigned int>(port));
return {};
}
service.resize(ptr - service.data());
}
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_ADDRCONFIG;
struct addrinfo* result;
if (auto err = getaddrinfo(host.empty() ? nullptr : host.c_str(),
service.c_str(),
&hints, &result)) {
logger->err("Unable to resolve %s:%u: %s",
host.c_str(), static_cast<unsigned int>(port),
gai_strerror(err));
return {};
}
for (auto* rp = result; rp; rp = rp->ai_next) {
unique_fd fd(socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol));
if (!fd) {
logger->warn("Unable to create socket: %s", strerror(errno));
continue;
}
if (bind(fd.get(), rp->ai_addr, rp->ai_addrlen)) {
logger->warn("Unable to bind socket: %s", strerror(errno));
continue;
}
fds.push_back(std::move(fd));
}
freeaddrinfo(result);
{
auto it = fds.begin();
while (it != fds.end()) {
if (listen(it->get(), SOMAXCONN)) {
logger->err("Unable to listen: %s", strerror(errno));
it = fds.erase(it);
} else {
++it;
}
}
}
return fds;
}
unique_fd connect(Logger* logger, std::string const& host, uint16_t port) {
unique_fd fd;
std::string service;
service.resize(10);
{
auto [ptr, err] = std::to_chars(service.data(),
service.data() + service.size(), port);
if (err != std::errc{}) {
logger->err("Invalid port: %u", static_cast<unsigned int>(port));
return fd;
}
service.resize(ptr - service.data());
}
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICSERV | AI_ADDRCONFIG;
struct addrinfo* result;
if (auto err = getaddrinfo(host.c_str(), service.c_str(),
&hints, &result)) {
logger->err("Unable to resolve %s:%u: %s",
host.c_str(), static_cast<unsigned int>(port),
gai_strerror(err));
return fd;
}
for (auto* rp = result; rp; rp = rp->ai_next) {
// Note: SOCK_NONBLOCK is a linux 2.6.27+ thing.
fd.reset(socket(rp->ai_family, rp->ai_socktype | SOCK_NONBLOCK,
rp->ai_protocol));
if (!fd) {
logger->warn("Unable to create socket: %s", strerror(errno));
continue;
}
if (connect(fd.get(), rp->ai_addr, rp->ai_addrlen)) {
logger->warn("Unable to connect socket: %s", strerror(errno));
fd.reset();
continue;
}
break;
}
freeaddrinfo(result);
return fd;
}
unique_fd accept(Logger* logger, int fd) {
unique_fd ret(accept4(fd, nullptr, nullptr, SOCK_NONBLOCK));
if (!ret) {
if (errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) {
logger->warn("Error accepting connection: %s", strerror(errno));
}
}
return ret;
}
} // namespace net
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