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https://github.com/zeek/zeek.git
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f5a76c1aed
This largely copies over Spicy's `.clang-format` configuration file. The one place where we deviate is header include order since Zeek depends on headers being included in a certain order.
145 lines
4.5 KiB
C++
145 lines
4.5 KiB
C++
// See the file "COPYING" in the main distribution directory for copyright.
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#include "zeek/Flare.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <cerrno>
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#include "zeek/Reporter.h"
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#ifdef _MSC_VER
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#include <winsock2.h>
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#define fatalError(...) \
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do { \
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if ( reporter ) \
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reporter->FatalError(__VA_ARGS__); \
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else { \
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fprintf(stderr, __VA_ARGS__); \
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fprintf(stderr, "\n"); \
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_exit(1); \
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} \
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} while ( 0 )
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#endif
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namespace zeek::detail {
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Flare::Flare()
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#ifndef _MSC_VER
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: pipe(FD_CLOEXEC, FD_CLOEXEC, O_NONBLOCK, O_NONBLOCK) {
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}
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#else
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{
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WSADATA wsaData;
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if ( WSAStartup(MAKEWORD(2, 2), &wsaData) != 0 )
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fatalError("WSAStartup failure: %d", WSAGetLastError());
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recvfd = WSASocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, nullptr, 0, WSA_FLAG_OVERLAPPED | WSA_FLAG_NO_HANDLE_INHERIT);
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if ( recvfd == (int)INVALID_SOCKET )
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fatalError("WSASocket failure: %d", WSAGetLastError());
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sendfd = WSASocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, nullptr, 0, WSA_FLAG_OVERLAPPED | WSA_FLAG_NO_HANDLE_INHERIT);
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if ( sendfd == (int)INVALID_SOCKET )
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fatalError("WSASocket failure: %d", WSAGetLastError());
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sockaddr_in sa;
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memset(&sa, 0, sizeof(sa));
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sa.sin_family = AF_INET;
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sa.sin_addr.s_addr = inet_addr("127.0.0.1");
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if ( bind(recvfd, (sockaddr*)&sa, sizeof(sa)) == SOCKET_ERROR )
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fatalError("bind failure: %d", WSAGetLastError());
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int salen = sizeof(sa);
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if ( getsockname(recvfd, (sockaddr*)&sa, &salen) == SOCKET_ERROR )
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fatalError("getsockname failure: %d", WSAGetLastError());
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if ( connect(sendfd, (sockaddr*)&sa, sizeof(sa)) == SOCKET_ERROR )
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fatalError("connect failure: %d", WSAGetLastError());
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}
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#endif
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[[noreturn]] static void bad_pipe_op(const char* which, bool signal_safe) {
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if ( signal_safe )
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abort();
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char buf[256];
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util::zeek_strerror_r(errno, buf, sizeof(buf));
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if ( reporter )
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reporter->FatalErrorWithCore("unexpected pipe %s failure: %s", which, buf);
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else {
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fprintf(stderr, "unexpected pipe %s failure: %s", which, buf);
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abort();
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}
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}
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void Flare::Fire(bool signal_safe) {
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char tmp = 0;
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for ( ;; ) {
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#ifndef _MSC_VER
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int n = write(pipe.WriteFD(), &tmp, 1);
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#else
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int n = send(sendfd, &tmp, 1, 0);
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#endif
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if ( n > 0 )
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// Success -- wrote a byte to pipe.
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break;
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if ( n < 0 ) {
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#ifdef _MSC_VER
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errno = WSAGetLastError();
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bad_pipe_op("send", signal_safe);
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#endif
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if ( errno == EAGAIN )
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// Success: pipe is full and just need at least one byte in it.
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break;
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if ( errno == EINTR )
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// Interrupted: try again.
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continue;
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bad_pipe_op("write", signal_safe);
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}
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// No error, but didn't write a byte: try again.
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}
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}
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int Flare::Extinguish(bool signal_safe) {
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int rval = 0;
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char tmp[256];
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for ( ;; ) {
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#ifndef _MSC_VER
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int n = read(pipe.ReadFD(), &tmp, sizeof(tmp));
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#else
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int n = recv(recvfd, tmp, sizeof(tmp), 0);
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#endif
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if ( n >= 0 ) {
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rval += n;
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// Pipe may not be empty yet: try again.
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continue;
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}
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#ifdef _MSC_VER
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if ( WSAGetLastError() == WSAEWOULDBLOCK )
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break;
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errno = WSAGetLastError();
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bad_pipe_op("recv", signal_safe);
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#endif
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if ( errno == EAGAIN )
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// Success: pipe is now empty.
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break;
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if ( errno == EINTR )
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// Interrupted: try again.
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continue;
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bad_pipe_op("read", signal_safe);
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}
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return rval;
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}
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} // namespace zeek::detail
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