1027 lines
29 KiB
C++
1027 lines
29 KiB
C++
#include "shared.hh"
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#include "local-store.hh"
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#include "util.hh"
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#include "serialise.hh"
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#include "worker-protocol.hh"
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#include "archive.hh"
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#include "affinity.hh"
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#include "globals.hh"
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#include "builtins.hh"
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#include <algorithm>
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#include <cstring>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <pwd.h>
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#include <grp.h>
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using namespace nix;
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/* On platforms that have O_ASYNC, we can detect when a client
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disconnects and immediately kill any ongoing builds. On platforms
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that lack it, we only notice the disconnection the next time we try
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to write to the client. So if you have a builder that never
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generates output on stdout/stderr, the daemon will never notice
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that the client has disconnected until the builder terminates.
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GNU/Hurd does have O_ASYNC, but its Unix-domain socket translator
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(pflocal) does not implement F_SETOWN. See
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<http://lists.gnu.org/archive/html/bug-guix/2013-07/msg00021.html> for
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details.*/
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#if defined O_ASYNC && !defined __GNU__
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#define HAVE_HUP_NOTIFICATION
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#ifndef SIGPOLL
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#define SIGPOLL SIGIO
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#endif
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#endif
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static FdSource from(STDIN_FILENO);
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static FdSink to(STDOUT_FILENO);
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bool canSendStderr;
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/* This variable is used to keep track of whether a connection
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comes from a host other than the host running guix-daemon. */
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static bool isRemoteConnection;
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/* This function is called anytime we want to write something to
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stderr. If we're in a state where the protocol allows it (i.e.,
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when canSendStderr), send the message to the client over the
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socket. */
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static void tunnelStderr(const unsigned char * buf, size_t count)
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{
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if (canSendStderr) {
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try {
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writeInt(STDERR_NEXT, to);
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writeString(buf, count, to);
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to.flush();
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} catch (...) {
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/* Write failed; that means that the other side is
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gone. */
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canSendStderr = false;
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throw;
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}
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} else
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writeFull(STDERR_FILENO, buf, count);
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}
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/* Return true if the remote side has closed its end of the
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connection, false otherwise. Should not be called on any socket on
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which we expect input! */
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static bool isFarSideClosed(int socket)
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{
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struct timeval timeout;
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timeout.tv_sec = timeout.tv_usec = 0;
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(socket, &fds);
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while (select(socket + 1, &fds, 0, 0, &timeout) == -1)
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if (errno != EINTR) throw SysError("select()");
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if (!FD_ISSET(socket, &fds)) return false;
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/* Destructive read to determine whether the select() marked the
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socket as readable because there is actual input or because
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we've reached EOF (i.e., a read of size 0 is available). */
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char c;
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int rd;
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if ((rd = read(socket, &c, 1)) > 0)
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throw Error("EOF expected (protocol error?)");
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else if (rd == -1 && errno != ECONNRESET)
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throw SysError("expected connection reset or EOF");
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return true;
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}
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/* A SIGPOLL signal is received when data is available on the client
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communication socket, or when the client has closed its side of the
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socket. This handler is enabled at precisely those moments in the
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protocol when we're doing work and the client is supposed to be
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quiet. Thus, if we get a SIGPOLL signal, it means that the client
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has quit. So we should quit as well.
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Too bad most operating systems don't support the POLL_HUP value for
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si_code in siginfo_t. That would make most of the SIGPOLL
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complexity unnecessary, i.e., we could just enable SIGPOLL all the
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time and wouldn't have to worry about races. */
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static void sigPollHandler(int sigNo)
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{
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using namespace std;
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try {
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/* Check that the far side actually closed. We're still
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getting spurious signals every once in a while. I.e.,
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there is no input available, but we get a signal with
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POLL_IN set. Maybe it's delayed or something. */
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if (isFarSideClosed(from.fd)) {
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if (!blockInt) {
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_isInterrupted = 1;
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blockInt = 1;
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canSendStderr = false;
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const char * s = "SIGPOLL\n";
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write(STDERR_FILENO, s, strlen(s));
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}
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} else {
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const char * s = "spurious SIGPOLL\n";
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write(STDERR_FILENO, s, strlen(s));
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}
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}
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catch (Error & e) {
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/* Shouldn't happen. */
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string s = "impossible: " + e.msg() + '\n';
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write(STDERR_FILENO, s.data(), s.size());
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throw;
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}
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}
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static void setSigPollAction(bool enable)
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{
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#ifdef HAVE_HUP_NOTIFICATION
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struct sigaction act, oact;
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act.sa_handler = enable ? sigPollHandler : SIG_IGN;
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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if (sigaction(SIGPOLL, &act, &oact))
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throw SysError("setting handler for SIGPOLL");
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#endif
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}
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/* startWork() means that we're starting an operation for which we
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want to send out stderr to the client. */
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static void startWork()
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{
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canSendStderr = true;
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/* Handle client death asynchronously. */
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setSigPollAction(true);
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/* Of course, there is a race condition here: the socket could
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have closed between when we last read from / wrote to it, and
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between the time we set the handler for SIGPOLL. In that case
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we won't get the signal. So do a non-blocking select() to find
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out if any input is available on the socket. If there is, it
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has to be the 0-byte read that indicates that the socket has
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closed. */
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if (isFarSideClosed(from.fd)) {
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_isInterrupted = 1;
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checkInterrupt();
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}
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}
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/* stopWork() means that we're done; stop sending stderr to the
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client. */
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static void stopWork(bool success = true, const string & msg = "", unsigned int status = 0)
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{
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/* Stop handling async client death; we're going to a state where
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we're either sending or receiving from the client, so we'll be
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notified of client death anyway. */
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setSigPollAction(false);
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canSendStderr = false;
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if (success)
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writeInt(STDERR_LAST, to);
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else {
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writeInt(STDERR_ERROR, to);
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writeString(msg, to);
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if (status != 0) writeInt(status, to);
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}
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}
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struct TunnelSink : BufferedSink
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{
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Sink & to;
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TunnelSink(Sink & to) : BufferedSink(64 * 1024), to(to) { }
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virtual void write(const unsigned char * data, size_t len)
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{
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writeInt(STDERR_WRITE, to);
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writeString(data, len, to);
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}
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};
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struct TunnelSource : BufferedSource
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{
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Source & from;
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TunnelSource(Source & from) : from(from) { }
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size_t readUnbuffered(unsigned char * data, size_t len)
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{
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/* Careful: we're going to receive data from the client now,
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so we have to disable the SIGPOLL handler. */
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setSigPollAction(false);
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canSendStderr = false;
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writeInt(STDERR_READ, to);
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writeInt(len, to);
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to.flush();
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size_t n = readString(data, len, from);
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startWork();
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if (n == 0) throw EndOfFile("unexpected end-of-file");
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return n;
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}
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};
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/* If the NAR archive contains a single file at top-level, then save
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the contents of the file to `s'. Otherwise barf. */
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struct RetrieveRegularNARSink : ParseSink
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{
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bool regular;
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string s;
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RetrieveRegularNARSink() : regular(true) { }
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void createDirectory(const Path & path)
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{
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regular = false;
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}
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void receiveContents(unsigned char * data, unsigned int len)
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{
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s.append((const char *) data, len);
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}
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void createSymlink(const Path & path, const string & target)
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{
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regular = false;
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}
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};
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/* Adapter class of a Source that saves all data read to `s'. */
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struct SavingSourceAdapter : Source
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{
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Source & orig;
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string s;
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SavingSourceAdapter(Source & orig) : orig(orig) { }
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size_t read(unsigned char * data, size_t len)
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{
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size_t n = orig.read(data, len);
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s.append((const char *) data, n);
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return n;
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}
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};
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static void performOp(bool trusted, unsigned int clientVersion,
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Source & from, Sink & to, unsigned int op)
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{
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switch (op) {
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case wopIsValidPath: {
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/* 'readStorePath' could raise an error leading to the connection
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being closed. To be able to recover from an invalid path error,
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call 'startWork' early, and do 'assertStorePath' afterwards so
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that the 'Error' exception handler doesn't close the
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connection. */
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Path path = readString(from);
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startWork();
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assertStorePath(path);
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bool result = store->isValidPath(path);
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stopWork();
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writeInt(result, to);
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break;
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}
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case wopQueryValidPaths: {
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PathSet paths = readStorePaths<PathSet>(from);
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startWork();
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PathSet res = store->queryValidPaths(paths);
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stopWork();
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writeStrings(res, to);
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break;
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}
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case wopHasSubstitutes: {
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Path path = readStorePath(from);
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startWork();
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PathSet res = store->querySubstitutablePaths(singleton<PathSet>(path));
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stopWork();
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writeInt(res.find(path) != res.end(), to);
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break;
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}
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case wopQuerySubstitutablePaths: {
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PathSet paths = readStorePaths<PathSet>(from);
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startWork();
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PathSet res = store->querySubstitutablePaths(paths);
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stopWork();
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writeStrings(res, to);
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break;
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}
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case wopQueryPathHash: {
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Path path = readStorePath(from);
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startWork();
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Hash hash = store->queryPathHash(path);
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stopWork();
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writeString(printHash(hash), to);
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break;
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}
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case wopQueryReferences:
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case wopQueryReferrers:
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case wopQueryValidDerivers:
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case wopQueryDerivationOutputs: {
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Path path = readStorePath(from);
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startWork();
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PathSet paths;
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if (op == wopQueryReferences)
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store->queryReferences(path, paths);
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else if (op == wopQueryReferrers)
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store->queryReferrers(path, paths);
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else if (op == wopQueryValidDerivers)
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paths = store->queryValidDerivers(path);
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else paths = store->queryDerivationOutputs(path);
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stopWork();
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writeStrings(paths, to);
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break;
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}
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case wopQueryDerivationOutputNames: {
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Path path = readStorePath(from);
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startWork();
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StringSet names;
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names = store->queryDerivationOutputNames(path);
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stopWork();
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writeStrings(names, to);
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break;
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}
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case wopQueryDeriver: {
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Path path = readStorePath(from);
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startWork();
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Path deriver = store->queryDeriver(path);
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stopWork();
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writeString(deriver, to);
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break;
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}
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case wopQueryPathFromHashPart: {
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string hashPart = readString(from);
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startWork();
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Path path = store->queryPathFromHashPart(hashPart);
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stopWork();
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writeString(path, to);
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break;
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}
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case wopAddToStore: {
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string baseName = readString(from);
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bool fixed = readInt(from) == 1; /* obsolete */
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bool recursive = readInt(from) == 1;
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string s = readString(from);
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/* Compatibility hack. */
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if (!fixed) {
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s = "sha256";
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recursive = true;
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}
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HashType hashAlgo = parseHashType(s);
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SavingSourceAdapter savedNAR(from);
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RetrieveRegularNARSink savedRegular;
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if (recursive) {
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/* Get the entire NAR dump from the client and save it to
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a string so that we can pass it to
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addToStoreFromDump(). */
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ParseSink sink; /* null sink; just parse the NAR */
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parseDump(sink, savedNAR);
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} else
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parseDump(savedRegular, from);
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startWork();
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if (!savedRegular.regular) throw Error("regular file expected");
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Path path = dynamic_cast<LocalStore *>(store.get())
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->addToStoreFromDump(recursive ? savedNAR.s : savedRegular.s, baseName, recursive, hashAlgo);
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stopWork();
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writeString(path, to);
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break;
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}
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case wopAddTextToStore: {
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string suffix = readString(from);
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string s = readString(from);
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PathSet refs = readStorePaths<PathSet>(from);
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startWork();
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Path path = store->addTextToStore(suffix, s, refs);
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stopWork();
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writeString(path, to);
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break;
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}
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case wopExportPath: {
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Path path = readStorePath(from);
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bool sign = readInt(from) == 1;
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startWork();
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TunnelSink sink(to);
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try {
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store->exportPath(path, sign, sink);
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}
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catch (Error &e) {
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/* Flush SINK beforehand or its destructor will rightfully trigger
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an assertion failure. */
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sink.flush();
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throw e;
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}
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sink.flush();
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stopWork();
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writeInt(1, to);
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break;
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}
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case wopImportPaths: {
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startWork();
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TunnelSource source(from);
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/* Unlike Nix, always require a signature, even for "trusted"
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users. */
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Paths paths = store->importPaths(true, source);
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stopWork();
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writeStrings(paths, to);
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break;
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}
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case wopBuildPaths: {
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PathSet drvs = readStorePaths<PathSet>(from);
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BuildMode mode = bmNormal;
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if (GET_PROTOCOL_MINOR(clientVersion) >= 15) {
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mode = (BuildMode)readInt(from);
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/* Repairing is not atomic, so disallowed for "untrusted"
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clients. */
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if (mode == bmRepair && !trusted)
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throw Error("repairing is not supported when building through the Nix daemon");
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}
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startWork();
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store->buildPaths(drvs, mode);
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stopWork();
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writeInt(1, to);
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break;
|
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}
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|
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case wopEnsurePath: {
|
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Path path = readStorePath(from);
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startWork();
|
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store->ensurePath(path);
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stopWork();
|
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writeInt(1, to);
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break;
|
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}
|
|
|
|
case wopAddTempRoot: {
|
|
Path path = readStorePath(from);
|
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startWork();
|
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store->addTempRoot(path);
|
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stopWork();
|
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writeInt(1, to);
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break;
|
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}
|
|
|
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case wopAddIndirectRoot: {
|
|
Path path = absPath(readString(from));
|
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startWork();
|
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store->addIndirectRoot(path);
|
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stopWork();
|
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writeInt(1, to);
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break;
|
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}
|
|
|
|
case wopSyncWithGC: {
|
|
startWork();
|
|
store->syncWithGC();
|
|
stopWork();
|
|
writeInt(1, to);
|
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break;
|
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}
|
|
|
|
case wopFindRoots: {
|
|
startWork();
|
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Roots roots = store->findRoots();
|
|
stopWork();
|
|
writeInt(roots.size(), to);
|
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for (Roots::iterator i = roots.begin(); i != roots.end(); ++i) {
|
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writeString(i->first, to);
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writeString(i->second, to);
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}
|
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break;
|
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}
|
|
|
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case wopCollectGarbage: {
|
|
if (isRemoteConnection) {
|
|
throw Error("Garbage collection is disabled for remote hosts.");
|
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break;
|
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}
|
|
|
|
GCOptions options;
|
|
options.action = (GCOptions::GCAction) readInt(from);
|
|
options.pathsToDelete = readStorePaths<PathSet>(from);
|
|
options.ignoreLiveness = readInt(from);
|
|
options.maxFreed = readLongLong(from);
|
|
readInt(from); // obsolete field
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 5) {
|
|
/* removed options */
|
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readInt(from);
|
|
readInt(from);
|
|
}
|
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|
|
GCResults results;
|
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|
|
startWork();
|
|
if (options.ignoreLiveness)
|
|
throw Error("you are not allowed to ignore liveness");
|
|
store->collectGarbage(options, results);
|
|
stopWork();
|
|
|
|
writeStrings(results.paths, to);
|
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writeLongLong(results.bytesFreed, to);
|
|
writeLongLong(0, to); // obsolete
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|
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break;
|
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}
|
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|
|
case wopSetOptions: {
|
|
settings.keepFailed = readInt(from) != 0;
|
|
if (isRemoteConnection)
|
|
/* When the client is remote, don't keep the failed build tree as
|
|
it is presumably inaccessible to the client and could fill up
|
|
our disk. */
|
|
settings.keepFailed = 0;
|
|
|
|
settings.keepGoing = readInt(from) != 0;
|
|
settings.set("build-fallback", readInt(from) ? "true" : "false");
|
|
verbosity = (Verbosity) readInt(from);
|
|
|
|
if (GET_PROTOCOL_MINOR(clientVersion) < 0x61) {
|
|
settings.set("build-max-jobs", std::to_string(readInt(from)));
|
|
settings.set("build-max-silent-time", std::to_string(readInt(from)));
|
|
}
|
|
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 2)
|
|
settings.useBuildHook = readInt(from) != 0;
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 4) {
|
|
settings.buildVerbosity = (Verbosity) readInt(from);
|
|
logType = (LogType) readInt(from);
|
|
settings.printBuildTrace = readInt(from) != 0;
|
|
}
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 6
|
|
&& GET_PROTOCOL_MINOR(clientVersion) < 0x61)
|
|
settings.set("build-cores", std::to_string(readInt(from)));
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 10)
|
|
settings.set("build-use-substitutes", readInt(from) ? "true" : "false");
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 12) {
|
|
unsigned int n = readInt(from);
|
|
for (unsigned int i = 0; i < n; i++) {
|
|
string name = readString(from);
|
|
string value = readString(from);
|
|
if (name == "build-timeout" || name == "build-max-silent-time"
|
|
|| name == "build-max-jobs" || name == "build-cores"
|
|
|| name == "build-repeat"
|
|
|| name == "multiplexed-build-output")
|
|
settings.set(name, value);
|
|
else
|
|
settings.set(trusted ? name : "untrusted-" + name, value);
|
|
}
|
|
}
|
|
settings.update();
|
|
startWork();
|
|
stopWork();
|
|
break;
|
|
}
|
|
|
|
case wopQuerySubstitutablePathInfo: {
|
|
Path path = absPath(readString(from));
|
|
startWork();
|
|
SubstitutablePathInfos infos;
|
|
store->querySubstitutablePathInfos(singleton<PathSet>(path), infos);
|
|
stopWork();
|
|
SubstitutablePathInfos::iterator i = infos.find(path);
|
|
if (i == infos.end())
|
|
writeInt(0, to);
|
|
else {
|
|
writeInt(1, to);
|
|
writeString(i->second.deriver, to);
|
|
writeStrings(i->second.references, to);
|
|
writeLongLong(i->second.downloadSize, to);
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 7)
|
|
writeLongLong(i->second.narSize, to);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case wopQuerySubstitutablePathInfos: {
|
|
PathSet paths = readStorePaths<PathSet>(from);
|
|
startWork();
|
|
SubstitutablePathInfos infos;
|
|
store->querySubstitutablePathInfos(paths, infos);
|
|
stopWork();
|
|
writeInt(infos.size(), to);
|
|
foreach (SubstitutablePathInfos::iterator, i, infos) {
|
|
writeString(i->first, to);
|
|
writeString(i->second.deriver, to);
|
|
writeStrings(i->second.references, to);
|
|
writeLongLong(i->second.downloadSize, to);
|
|
writeLongLong(i->second.narSize, to);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case wopQueryAllValidPaths: {
|
|
startWork();
|
|
PathSet paths = store->queryAllValidPaths();
|
|
stopWork();
|
|
writeStrings(paths, to);
|
|
break;
|
|
}
|
|
|
|
case wopQueryFailedPaths: {
|
|
startWork();
|
|
PathSet paths = store->queryFailedPaths();
|
|
stopWork();
|
|
writeStrings(paths, to);
|
|
break;
|
|
}
|
|
|
|
case wopClearFailedPaths: {
|
|
PathSet paths = readStrings<PathSet>(from);
|
|
startWork();
|
|
store->clearFailedPaths(paths);
|
|
stopWork();
|
|
writeInt(1, to);
|
|
break;
|
|
}
|
|
|
|
case wopQueryPathInfo: {
|
|
Path path = readStorePath(from);
|
|
startWork();
|
|
ValidPathInfo info = store->queryPathInfo(path);
|
|
stopWork();
|
|
writeString(info.deriver, to);
|
|
writeString(printHash(info.hash), to);
|
|
writeStrings(info.references, to);
|
|
writeInt(info.registrationTime, to);
|
|
writeLongLong(info.narSize, to);
|
|
break;
|
|
}
|
|
|
|
case wopOptimiseStore:
|
|
startWork();
|
|
store->optimiseStore();
|
|
stopWork();
|
|
writeInt(1, to);
|
|
break;
|
|
|
|
case wopVerifyStore: {
|
|
bool checkContents = readInt(from) != 0;
|
|
bool repair = readInt(from) != 0;
|
|
startWork();
|
|
if (repair && !trusted)
|
|
throw Error("you are not privileged to repair paths");
|
|
bool errors = store->verifyStore(checkContents, repair);
|
|
stopWork();
|
|
writeInt(errors, to);
|
|
break;
|
|
}
|
|
|
|
case wopBuiltinBuilders: {
|
|
startWork();
|
|
auto names = builtinBuilderNames();
|
|
stopWork();
|
|
writeStrings(names, to);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
throw Error(format("invalid operation %1%") % op);
|
|
}
|
|
}
|
|
|
|
|
|
static void processConnection(bool trusted)
|
|
{
|
|
canSendStderr = false;
|
|
_writeToStderr = tunnelStderr;
|
|
|
|
#ifdef HAVE_HUP_NOTIFICATION
|
|
/* Allow us to receive SIGPOLL for events on the client socket. */
|
|
setSigPollAction(false);
|
|
if (fcntl(from.fd, F_SETOWN, getpid()) == -1)
|
|
throw SysError("F_SETOWN");
|
|
if (fcntl(from.fd, F_SETFL, fcntl(from.fd, F_GETFL, 0) | O_ASYNC) == -1)
|
|
throw SysError("F_SETFL");
|
|
#endif
|
|
|
|
/* Exchange the greeting. */
|
|
unsigned int magic = readInt(from);
|
|
if (magic != WORKER_MAGIC_1) throw Error("protocol mismatch");
|
|
writeInt(WORKER_MAGIC_2, to);
|
|
writeInt(PROTOCOL_VERSION, to);
|
|
to.flush();
|
|
unsigned int clientVersion = readInt(from);
|
|
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 14 && readInt(from))
|
|
setAffinityTo(readInt(from));
|
|
|
|
bool reserveSpace = true;
|
|
if (GET_PROTOCOL_MINOR(clientVersion) >= 11)
|
|
reserveSpace = readInt(from) != 0;
|
|
|
|
/* Send startup error messages to the client. */
|
|
startWork();
|
|
|
|
try {
|
|
|
|
/* If we can't accept clientVersion, then throw an error
|
|
*here* (not above). */
|
|
|
|
#if 0
|
|
/* Prevent users from doing something very dangerous. */
|
|
if (geteuid() == 0 &&
|
|
querySetting("build-users-group", "") == "")
|
|
throw Error("if you run `nix-daemon' as root, then you MUST set `build-users-group'!");
|
|
#endif
|
|
|
|
/* Open the store. */
|
|
store = std::shared_ptr<StoreAPI>(new LocalStore(reserveSpace));
|
|
|
|
stopWork();
|
|
to.flush();
|
|
|
|
} catch (Error & e) {
|
|
stopWork(false, e.msg(), GET_PROTOCOL_MINOR(clientVersion) >= 8 ? 1 : 0);
|
|
to.flush();
|
|
return;
|
|
}
|
|
|
|
/* Process client requests. */
|
|
unsigned int opCount = 0;
|
|
|
|
while (true) {
|
|
WorkerOp op;
|
|
try {
|
|
op = (WorkerOp) readInt(from);
|
|
} catch (EndOfFile & e) {
|
|
break;
|
|
}
|
|
|
|
opCount++;
|
|
|
|
try {
|
|
performOp(trusted, clientVersion, from, to, op);
|
|
} catch (Error & e) {
|
|
/* If we're not in a state where we can send replies, then
|
|
something went wrong processing the input of the
|
|
client. This can happen especially if I/O errors occur
|
|
during addTextToStore() / importPath(). If that
|
|
happens, just send the error message and exit. */
|
|
bool errorAllowed = canSendStderr;
|
|
stopWork(false, e.msg(), GET_PROTOCOL_MINOR(clientVersion) >= 8 ? e.status : 0);
|
|
if (!errorAllowed) throw;
|
|
} catch (std::bad_alloc & e) {
|
|
stopWork(false, "Nix daemon out of memory", GET_PROTOCOL_MINOR(clientVersion) >= 8 ? 1 : 0);
|
|
throw;
|
|
}
|
|
|
|
to.flush();
|
|
|
|
assert(!canSendStderr);
|
|
};
|
|
|
|
canSendStderr = false;
|
|
_isInterrupted = false;
|
|
printMsg(lvlDebug, format("%1% operations") % opCount);
|
|
}
|
|
|
|
|
|
static void sigChldHandler(int sigNo)
|
|
{
|
|
/* Reap all dead children. */
|
|
while (waitpid(-1, 0, WNOHANG) > 0) ;
|
|
}
|
|
|
|
|
|
static void setSigChldAction(bool autoReap)
|
|
{
|
|
struct sigaction act, oact;
|
|
act.sa_handler = autoReap ? sigChldHandler : SIG_DFL;
|
|
sigfillset(&act.sa_mask);
|
|
act.sa_flags = 0;
|
|
if (sigaction(SIGCHLD, &act, &oact))
|
|
throw SysError("setting SIGCHLD handler");
|
|
}
|
|
|
|
|
|
/* Accept a connection on FDSOCKET and fork a server process to process the
|
|
new connection. */
|
|
static void acceptConnection(int fdSocket)
|
|
{
|
|
uid_t clientUid = (uid_t) -1;
|
|
gid_t clientGid = (gid_t) -1;
|
|
|
|
try {
|
|
/* Important: the server process *cannot* open the SQLite
|
|
database, because it doesn't like forks very much. */
|
|
assert(!store);
|
|
|
|
/* Accept a connection. */
|
|
struct sockaddr_storage remoteAddr;
|
|
socklen_t remoteAddrLen = sizeof(remoteAddr);
|
|
|
|
try_again:
|
|
AutoCloseFD remote = accept(fdSocket,
|
|
(struct sockaddr *) &remoteAddr, &remoteAddrLen);
|
|
checkInterrupt();
|
|
if (remote == -1) {
|
|
if (errno == EINTR)
|
|
goto try_again;
|
|
else
|
|
throw SysError("accepting connection");
|
|
}
|
|
|
|
closeOnExec(remote);
|
|
|
|
{
|
|
int enabled = 1;
|
|
|
|
/* If we're on a TCP connection, disable Nagle's algorithm so that
|
|
data is sent as soon as possible. */
|
|
(void) setsockopt(remote, SOL_TCP, TCP_NODELAY,
|
|
&enabled, sizeof enabled);
|
|
|
|
#if defined(TCP_QUICKACK)
|
|
/* Enable TCP quick-ack if applicable; this might help a little. */
|
|
(void) setsockopt(remote, SOL_TCP, TCP_QUICKACK,
|
|
&enabled, sizeof enabled);
|
|
#endif
|
|
}
|
|
|
|
pid_t clientPid = -1;
|
|
bool trusted = false;
|
|
|
|
/* Get the identity of the caller, if possible. */
|
|
if (remoteAddr.ss_family == AF_UNIX) {
|
|
#if defined(SO_PEERCRED)
|
|
ucred cred;
|
|
socklen_t credLen = sizeof(cred);
|
|
if (getsockopt(remote, SOL_SOCKET, SO_PEERCRED,
|
|
&cred, &credLen) == -1)
|
|
throw SysError("getting peer credentials");
|
|
|
|
clientPid = cred.pid;
|
|
clientUid = cred.uid;
|
|
clientGid = cred.gid;
|
|
trusted = clientUid == 0;
|
|
|
|
struct passwd * pw = getpwuid(cred.uid);
|
|
string user = pw ? pw->pw_name : std::to_string(cred.uid);
|
|
|
|
printMsg(lvlInfo,
|
|
format((string) "accepted connection from pid %1%, user %2%")
|
|
% clientPid % user);
|
|
#endif
|
|
} else {
|
|
char address_str[128];
|
|
const char *result;
|
|
|
|
if (remoteAddr.ss_family == AF_INET) {
|
|
struct sockaddr_in *addr = (struct sockaddr_in *) &remoteAddr;
|
|
result = inet_ntop(AF_INET, &addr->sin_addr,
|
|
address_str, sizeof address_str);
|
|
} else if (remoteAddr.ss_family == AF_INET6) {
|
|
struct sockaddr_in6 *addr = (struct sockaddr_in6 *) &remoteAddr;
|
|
result = inet_ntop(AF_INET6, &addr->sin6_addr,
|
|
address_str, sizeof address_str);
|
|
} else {
|
|
result = NULL;
|
|
}
|
|
|
|
if (result != NULL) {
|
|
printMsg(lvlInfo,
|
|
format("accepted connection from %1%")
|
|
% address_str);
|
|
}
|
|
}
|
|
|
|
/* Fork a child to handle the connection. */
|
|
startProcess([&]() {
|
|
close(fdSocket);
|
|
|
|
/* Background the daemon. */
|
|
if (setsid() == -1)
|
|
throw SysError(format("creating a new session"));
|
|
|
|
/* Restore normal handling of SIGCHLD. */
|
|
setSigChldAction(false);
|
|
|
|
/* For debugging, stuff the pid into argv[1]. */
|
|
if (clientPid != -1 && argvSaved[1]) {
|
|
string processName = std::to_string(clientPid);
|
|
strncpy(argvSaved[1], processName.c_str(), strlen(argvSaved[1]));
|
|
}
|
|
|
|
/* Store the client's user and group for this connection. This
|
|
has to be done in the forked process since it is per
|
|
connection. Setting these to -1 means: do not change. */
|
|
settings.clientUid = clientUid;
|
|
settings.clientGid = clientGid;
|
|
isRemoteConnection = (remoteAddr.ss_family != AF_UNIX);
|
|
|
|
/* Handle the connection. */
|
|
from.fd = remote;
|
|
to.fd = remote;
|
|
processConnection(trusted);
|
|
|
|
exit(0);
|
|
}, false, "unexpected Nix daemon error: ", true);
|
|
|
|
} catch (Interrupted & e) {
|
|
throw;
|
|
} catch (Error & e) {
|
|
printMsg(lvlError, format("error processing connection: %1%") % e.msg());
|
|
}
|
|
}
|
|
|
|
static void daemonLoop(const std::vector<int>& sockets)
|
|
{
|
|
if (chdir("/") == -1)
|
|
throw SysError("cannot change current directory");
|
|
|
|
/* Get rid of children automatically; don't let them become
|
|
zombies. */
|
|
setSigChldAction(true);
|
|
|
|
/* Mark sockets as close-on-exec. */
|
|
for(int fd: sockets) {
|
|
closeOnExec(fd);
|
|
}
|
|
|
|
/* Prepare the FD set corresponding to SOCKETS. */
|
|
auto initializeFDSet = [&](fd_set *set) {
|
|
FD_ZERO(set);
|
|
for (int fd: sockets) {
|
|
FD_SET(fd, set);
|
|
}
|
|
};
|
|
|
|
/* Loop accepting connections. */
|
|
while (1) {
|
|
fd_set readfds;
|
|
|
|
initializeFDSet(&readfds);
|
|
int count =
|
|
select(*std::max_element(sockets.begin(), sockets.end()) + 1,
|
|
&readfds, NULL, NULL,
|
|
NULL);
|
|
if (count < 0) {
|
|
int err = errno;
|
|
if (err == EINTR)
|
|
continue;
|
|
throw SysError(format("select error: %1%") % strerror(err));
|
|
}
|
|
|
|
for (unsigned int i = 0; i < sockets.size(); i++) {
|
|
if (FD_ISSET(sockets[i], &readfds)) {
|
|
acceptConnection(sockets[i]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void run(const std::vector<int>& sockets)
|
|
{
|
|
daemonLoop(sockets);
|
|
}
|
|
|
|
|
|
void printHelp()
|
|
{
|
|
showManPage("nix-daemon");
|
|
}
|
|
|
|
|
|
string programId = "nix-daemon";
|