raw_tcp_client.h

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// Small cross-platform (POSIX + MSVC/Windows) helpers for the hand-rolled
// "raw socket" client/server code the H1/H2 tests use to drive libhttppp
// with wire bytes they build themselves (HPACK frames, chunked encoding,
// etc.) instead of going through HttpClient. Built on netplus::tcp so these
// tests link and run under MSVC the same as everywhere else libnetplus
// already abstracts POSIX vs Winsock -- none of the test .cpp files should
// need to include <sys/socket.h>/<arpa/inet.h>/<netinet/in.h>/<unistd.h> or
// call ::socket()/::connect()/::send()/::recv()/::close() directly.
 
#pragma once
 
#include <cstring>
#include <stdexcept>
#include <string>
 
#include <netplus/exception.h>
#include <netplus/socket.h>
 
namespace rawtcp {
 
// Reads back the OS-assigned port of a socket bound with port 0 (ephemeral
// port allocation), e.g. right after netplus::tcp::bind(). getsockname()
// itself is standard Berkeley/Winsock API available on both platforms --
// sockaddr_in/AF_INET/ntohs all come in transitively via netplus/socket.h,
// which already includes the right platform headers for each side.
inline int boundPort(netplus::socket &sock) {
    sockaddr_in bound{};
    socklen_t blen = sizeof(bound);
    ::getsockname(sock.fd(), reinterpret_cast<sockaddr *>(&bound), &blen);
    return ntohs(bound.sin_port);
}
 
// Connects a blocking netplus::tcp client socket to 127.0.0.1:port.
inline void connectLocal(netplus::tcp &sock, int port) {
    sock.connect("127.0.0.1", port);
}
 
// Sends the entire buffer, loop over short writes like the raw ::send() loops
// this replaces. Throws std::runtime_error if the peer is gone -- the
// contract every raw-client call site here relies on (it's a test bug if a
// hand-built request can't be sent to a server this test itself just
// started).
inline void sendAllOrThrow(netplus::socket &sock, const char *data, size_t len) {
    size_t sent = 0;
    while (sent < len) {
        netplus::buffer buf(data + sent, len - sent);
        size_t n;
        try {
            n = sock.sendData(buf);
        } catch (netplus::NetException &e) {
            throw std::runtime_error(std::string("rawtcp::sendAllOrThrow: ") + e.what());
        }
        if (n == 0) throw std::runtime_error("rawtcp::sendAllOrThrow: send failed");
        sent += n;
    }
}
inline void sendAllOrThrow(netplus::socket &sock, const std::string &s) {
    sendAllOrThrow(sock, s.data(), s.size());
}
 
} // namespace rawtcp