2006-11-30 19:19:59 +00:00
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#include "shared.hh"
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#include "local-store.hh"
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#include "util.hh"
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2006-11-30 19:54:43 +00:00
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#include "serialise.hh"
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2006-11-30 20:45:20 +00:00
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#include "archive.hh"
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2006-12-03 16:25:19 +00:00
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#include "globals.hh"
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2015-09-03 10:56:59 +00:00
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#include "derivations.hh"
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2017-08-28 12:17:07 +00:00
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#include "finally.hh"
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2018-10-26 09:35:46 +00:00
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#include "legacy.hh"
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2018-09-24 11:53:44 +00:00
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#include "daemon.hh"
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2006-11-30 19:19:59 +00:00
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2014-07-17 14:57:07 +00:00
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#include <algorithm>
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2010-06-24 17:51:04 +00:00
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#include <cstring>
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2006-12-03 03:03:36 +00:00
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#include <unistd.h>
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#include <signal.h>
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2006-12-04 17:17:13 +00:00
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#include <sys/types.h>
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2006-12-05 17:21:42 +00:00
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#include <sys/wait.h>
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2006-12-04 17:17:13 +00:00
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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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2006-12-05 17:21:42 +00:00
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#include <errno.h>
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2014-07-17 13:49:33 +00:00
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#include <pwd.h>
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2014-07-17 14:57:07 +00:00
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#include <grp.h>
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2016-09-02 17:30:28 +00:00
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#include <fcntl.h>
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2017-02-13 13:06:46 +00:00
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#include <limits.h>
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2006-12-02 14:27:24 +00:00
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2014-10-31 09:08:59 +00:00
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#if __APPLE__ || __FreeBSD__
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#include <sys/ucred.h>
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#endif
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2006-11-30 19:19:59 +00:00
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using namespace nix;
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2018-09-24 11:53:44 +00:00
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using namespace nix::daemon;
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2006-11-30 19:19:59 +00:00
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2016-09-02 17:30:28 +00:00
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#ifndef __linux__
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#define SPLICE_F_MOVE 0
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2016-11-17 13:10:12 +00:00
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static ssize_t splice(int fd_in, void *off_in, int fd_out, void *off_out, size_t len, unsigned int flags)
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2016-09-02 17:30:28 +00:00
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{
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/* We ignore most parameters, we just have them for conformance with the linux syscall */
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2018-03-01 21:00:58 +00:00
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std::vector<char> buf(8192);
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auto read_count = read(fd_in, buf.data(), buf.size());
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2016-09-02 17:30:28 +00:00
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if (read_count == -1)
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return read_count;
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2016-11-17 13:10:12 +00:00
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auto write_count = decltype(read_count)(0);
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2016-09-02 17:30:28 +00:00
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while (write_count < read_count) {
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2018-03-01 21:00:58 +00:00
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auto res = write(fd_out, buf.data() + write_count, read_count - write_count);
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2016-09-02 17:30:28 +00:00
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if (res == -1)
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return res;
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write_count += res;
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}
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return read_count;
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}
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#endif
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2006-11-30 19:19:59 +00:00
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2006-12-05 17:21:42 +00:00
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static void sigChldHandler(int sigNo)
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{
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2018-03-15 02:39:01 +00:00
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// Ensure we don't modify errno of whatever we've interrupted
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auto saved_errno = errno;
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2006-12-05 17:21:42 +00:00
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/* Reap all dead children. */
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2008-11-14 16:50:01 +00:00
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while (waitpid(-1, 0, WNOHANG) > 0) ;
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2018-03-15 02:39:01 +00:00
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errno = saved_errno;
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2006-12-05 17:21:42 +00:00
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}
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static void setSigChldAction(bool autoReap)
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2006-12-04 17:17:13 +00:00
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{
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struct sigaction act, oact;
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2006-12-05 17:21:42 +00:00
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act.sa_handler = autoReap ? sigChldHandler : SIG_DFL;
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2006-12-04 17:17:13 +00:00
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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if (sigaction(SIGCHLD, &act, &oact))
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throw SysError("setting SIGCHLD handler");
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}
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2014-07-17 14:57:07 +00:00
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bool matchUser(const string & user, const string & group, const Strings & users)
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{
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if (find(users.begin(), users.end(), "*") != users.end())
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return true;
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if (find(users.begin(), users.end(), user) != users.end())
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return true;
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for (auto & i : users)
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if (string(i, 0, 1) == "@") {
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if (group == string(i, 1)) return true;
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struct group * gr = getgrnam(i.c_str() + 1);
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if (!gr) continue;
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for (char * * mem = gr->gr_mem; *mem; mem++)
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if (user == string(*mem)) return true;
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}
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return false;
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}
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2014-10-31 09:08:59 +00:00
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struct PeerInfo
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{
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bool pidKnown;
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pid_t pid;
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bool uidKnown;
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uid_t uid;
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bool gidKnown;
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gid_t gid;
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};
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/* Get the identity of the caller, if possible. */
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static PeerInfo getPeerInfo(int remote)
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{
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PeerInfo peer = { false, 0, false, 0, false, 0 };
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#if defined(SO_PEERCRED)
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ucred cred;
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socklen_t credLen = sizeof(cred);
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if (getsockopt(remote, SOL_SOCKET, SO_PEERCRED, &cred, &credLen) == -1)
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throw SysError("getting peer credentials");
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peer = { true, cred.pid, true, cred.uid, true, cred.gid };
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#elif defined(LOCAL_PEERCRED)
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2015-10-04 11:53:23 +00:00
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#if !defined(SOL_LOCAL)
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#define SOL_LOCAL 0
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#endif
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2014-10-31 09:08:59 +00:00
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xucred cred;
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socklen_t credLen = sizeof(cred);
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if (getsockopt(remote, SOL_LOCAL, LOCAL_PEERCRED, &cred, &credLen) == -1)
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throw SysError("getting peer credentials");
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peer = { false, 0, true, cred.cr_uid, false, 0 };
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#endif
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return peer;
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}
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2012-06-19 03:01:46 +00:00
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#define SD_LISTEN_FDS_START 3
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2014-08-13 01:50:44 +00:00
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static void daemonLoop(char * * argv)
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2006-12-04 17:17:13 +00:00
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{
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2014-12-12 16:14:28 +00:00
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if (chdir("/") == -1)
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throw SysError("cannot change current directory");
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2014-08-13 01:50:44 +00:00
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2006-12-04 17:17:13 +00:00
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/* Get rid of children automatically; don't let them become
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zombies. */
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setSigChldAction(true);
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2012-06-19 03:01:46 +00:00
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AutoCloseFD fdSocket;
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/* Handle socket-based activation by systemd. */
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if (getEnv("LISTEN_FDS") != "") {
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2015-10-29 12:26:55 +00:00
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if (getEnv("LISTEN_PID") != std::to_string(getpid()) || getEnv("LISTEN_FDS") != "1")
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2012-06-19 03:01:46 +00:00
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throw Error("unexpected systemd environment variables");
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fdSocket = SD_LISTEN_FDS_START;
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}
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/* Otherwise, create and bind to a Unix domain socket. */
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else {
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2012-07-30 21:13:25 +00:00
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2012-06-19 03:01:46 +00:00
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/* Create and bind to a Unix domain socket. */
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fdSocket = socket(PF_UNIX, SOCK_STREAM, 0);
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2016-07-11 19:44:44 +00:00
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if (!fdSocket)
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2012-06-19 03:01:46 +00:00
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throw SysError("cannot create Unix domain socket");
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2013-03-08 00:24:59 +00:00
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string socketPath = settings.nixDaemonSocketFile;
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2006-12-04 17:17:13 +00:00
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2012-06-19 03:01:46 +00:00
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createDirs(dirOf(socketPath));
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2007-08-30 09:50:44 +00:00
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2012-06-19 03:01:46 +00:00
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/* Urgh, sockaddr_un allows path names of only 108 characters.
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So chdir to the socket directory so that we can pass a
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relative path name. */
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2014-12-12 16:14:28 +00:00
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if (chdir(dirOf(socketPath).c_str()) == -1)
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throw SysError("cannot change current directory");
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2012-06-19 03:01:46 +00:00
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Path socketPathRel = "./" + baseNameOf(socketPath);
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2012-07-30 21:13:25 +00:00
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2012-06-19 03:01:46 +00:00
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struct sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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if (socketPathRel.size() >= sizeof(addr.sun_path))
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2017-07-30 11:27:57 +00:00
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throw Error(format("socket path '%1%' is too long") % socketPathRel);
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2012-06-19 03:01:46 +00:00
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strcpy(addr.sun_path, socketPathRel.c_str());
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2006-12-04 17:17:13 +00:00
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2012-06-19 03:01:46 +00:00
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unlink(socketPath.c_str());
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2006-12-04 17:17:13 +00:00
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2012-06-19 03:01:46 +00:00
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/* Make sure that the socket is created with 0666 permission
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(everybody can connect --- provided they have access to the
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directory containing the socket). */
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mode_t oldMode = umask(0111);
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2016-07-11 19:44:44 +00:00
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int res = bind(fdSocket.get(), (struct sockaddr *) &addr, sizeof(addr));
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2012-06-19 03:01:46 +00:00
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umask(oldMode);
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if (res == -1)
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2017-07-30 11:27:57 +00:00
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throw SysError(format("cannot bind to socket '%1%'") % socketPath);
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2006-12-04 17:17:13 +00:00
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2014-12-12 16:14:28 +00:00
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if (chdir("/") == -1) /* back to the root */
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throw SysError("cannot change current directory");
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2008-04-09 05:57:01 +00:00
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2016-07-11 19:44:44 +00:00
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if (listen(fdSocket.get(), 5) == -1)
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2017-07-30 11:27:57 +00:00
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throw SysError(format("cannot listen on socket '%1%'") % socketPath);
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2012-06-19 03:01:46 +00:00
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}
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2006-12-04 17:17:13 +00:00
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2016-07-11 19:44:44 +00:00
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closeOnExec(fdSocket.get());
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2012-07-30 21:13:25 +00:00
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2006-12-04 17:17:13 +00:00
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/* Loop accepting connections. */
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while (1) {
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try {
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/* Accept a connection. */
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struct sockaddr_un remoteAddr;
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socklen_t remoteAddrLen = sizeof(remoteAddr);
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2016-07-11 19:44:44 +00:00
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AutoCloseFD remote = accept(fdSocket.get(),
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2006-12-04 17:17:13 +00:00
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(struct sockaddr *) &remoteAddr, &remoteAddrLen);
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checkInterrupt();
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2016-07-11 19:44:44 +00:00
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if (!remote) {
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2014-07-23 17:21:00 +00:00
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if (errno == EINTR) continue;
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throw SysError("accepting connection");
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2009-09-30 11:32:04 +00:00
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}
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2006-12-04 17:17:13 +00:00
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2016-07-11 19:44:44 +00:00
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closeOnExec(remote.get());
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2012-07-30 21:13:25 +00:00
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2013-06-12 10:10:26 +00:00
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bool trusted = false;
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2016-07-11 19:44:44 +00:00
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PeerInfo peer = getPeerInfo(remote.get());
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2014-07-17 13:41:11 +00:00
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2014-10-31 09:08:59 +00:00
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struct passwd * pw = peer.uidKnown ? getpwuid(peer.uid) : 0;
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2015-10-29 12:26:55 +00:00
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string user = pw ? pw->pw_name : std::to_string(peer.uid);
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2006-12-04 17:17:13 +00:00
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2014-10-31 09:08:59 +00:00
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struct group * gr = peer.gidKnown ? getgrgid(peer.gid) : 0;
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2015-10-29 12:26:55 +00:00
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string group = gr ? gr->gr_name : std::to_string(peer.gid);
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2014-07-17 14:57:07 +00:00
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Explicitly model all settings and fail on unrecognized ones
Previously, the Settings class allowed other code to query for string
properties, which led to a proliferation of code all over the place making
up new options without any sort of central registry of valid options. This
commit pulls all those options back into the central Settings class and
removes the public get() methods, to discourage future abuses like that.
Furthermore, because we know the full set of options ahead of time, we
now fail loudly if someone enters an unrecognized option, thus preventing
subtle typos. With some template fun, we could probably also dump the full
set of options (with documentation, defaults, etc.) to the command line,
but I'm not doing that yet here.
2017-02-22 03:50:18 +00:00
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Strings trustedUsers = settings.trustedUsers;
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Strings allowedUsers = settings.allowedUsers;
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2014-08-04 16:13:14 +00:00
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2014-08-05 08:19:57 +00:00
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if (matchUser(user, group, trustedUsers))
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2014-07-17 14:57:07 +00:00
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trusted = true;
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2018-02-07 21:17:44 +00:00
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if ((!trusted && !matchUser(user, group, allowedUsers)) || group == settings.buildUsersGroup)
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2017-07-30 11:27:57 +00:00
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throw Error(format("user '%1%' is not allowed to connect to the Nix daemon") % user);
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2014-07-17 13:49:33 +00:00
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2016-09-21 14:11:01 +00:00
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printInfo(format((string) "accepted connection from pid %1%, user %2%" + (trusted ? " (trusted)" : ""))
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2015-10-29 12:26:55 +00:00
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% (peer.pidKnown ? std::to_string(peer.pid) : "<unknown>")
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2014-10-31 09:08:59 +00:00
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% (peer.uidKnown ? user : "<unknown>"));
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2012-07-30 21:13:25 +00:00
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2006-12-04 17:17:13 +00:00
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/* Fork a child to handle the connection. */
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2014-12-10 15:35:42 +00:00
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ProcessOptions options;
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options.errorPrefix = "unexpected Nix daemon error: ";
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options.dieWithParent = false;
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options.runExitHandlers = true;
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options.allowVfork = false;
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2014-07-10 14:50:51 +00:00
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startProcess([&]() {
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2016-07-11 19:44:44 +00:00
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fdSocket = -1;
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2014-09-25 16:45:43 +00:00
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2014-07-10 14:50:51 +00:00
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/* Background the daemon. */
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if (setsid() == -1)
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throw SysError(format("creating a new session"));
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/* Restore normal handling of SIGCHLD. */
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setSigChldAction(false);
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/* For debugging, stuff the pid into argv[1]. */
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2014-10-31 09:08:59 +00:00
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if (peer.pidKnown && argv[1]) {
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2015-10-29 12:26:55 +00:00
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string processName = std::to_string(peer.pid);
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2014-08-13 01:50:44 +00:00
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strncpy(argv[1], processName.c_str(), strlen(argv[1]));
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2014-07-10 14:50:51 +00:00
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}
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2012-07-30 21:13:25 +00:00
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2014-07-10 14:50:51 +00:00
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/* Handle the connection. */
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2018-09-24 11:53:44 +00:00
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FdSource from(remote.get());
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FdSink to(remote.get());
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processConnection(from, to, trusted, user, peer.uid);
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2012-07-30 21:13:25 +00:00
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2014-11-19 16:09:27 +00:00
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exit(0);
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2014-12-10 15:35:42 +00:00
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}, options);
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2006-12-04 17:17:13 +00:00
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|
|
|
|
} catch (Interrupted & e) {
|
2018-04-09 12:05:54 +00:00
|
|
|
return;
|
2006-12-04 17:17:13 +00:00
|
|
|
} catch (Error & e) {
|
2016-09-21 14:11:01 +00:00
|
|
|
printError(format("error processing connection: %1%") % e.msg());
|
2006-12-04 17:17:13 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2018-10-26 09:35:46 +00:00
|
|
|
static int _main(int argc, char * * argv)
|
2006-11-30 19:19:59 +00:00
|
|
|
{
|
2018-10-26 09:35:46 +00:00
|
|
|
{
|
2016-09-02 17:30:28 +00:00
|
|
|
auto stdio = false;
|
|
|
|
|
2014-08-13 01:50:44 +00:00
|
|
|
parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
|
|
|
|
if (*arg == "--daemon")
|
|
|
|
; /* ignored for backwards compatibility */
|
|
|
|
else if (*arg == "--help")
|
|
|
|
showManPage("nix-daemon");
|
|
|
|
else if (*arg == "--version")
|
|
|
|
printVersion("nix-daemon");
|
2016-09-02 17:30:28 +00:00
|
|
|
else if (*arg == "--stdio")
|
|
|
|
stdio = true;
|
2014-08-13 01:50:44 +00:00
|
|
|
else return false;
|
|
|
|
return true;
|
|
|
|
});
|
|
|
|
|
2018-02-08 16:26:18 +00:00
|
|
|
initPlugins();
|
|
|
|
|
2016-09-02 17:30:28 +00:00
|
|
|
if (stdio) {
|
|
|
|
if (getStoreType() == tDaemon) {
|
|
|
|
/* Forward on this connection to the real daemon */
|
|
|
|
auto socketPath = settings.nixDaemonSocketFile;
|
|
|
|
auto s = socket(PF_UNIX, SOCK_STREAM, 0);
|
|
|
|
if (s == -1)
|
|
|
|
throw SysError("creating Unix domain socket");
|
|
|
|
|
|
|
|
auto socketDir = dirOf(socketPath);
|
|
|
|
if (chdir(socketDir.c_str()) == -1)
|
2017-07-30 11:27:57 +00:00
|
|
|
throw SysError(format("changing to socket directory '%1%'") % socketDir);
|
2016-09-02 17:30:28 +00:00
|
|
|
|
|
|
|
auto socketName = baseNameOf(socketPath);
|
|
|
|
auto addr = sockaddr_un{};
|
|
|
|
addr.sun_family = AF_UNIX;
|
|
|
|
if (socketName.size() + 1 >= sizeof(addr.sun_path))
|
|
|
|
throw Error(format("socket name %1% is too long") % socketName);
|
|
|
|
strcpy(addr.sun_path, socketName.c_str());
|
|
|
|
|
|
|
|
if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) == -1)
|
|
|
|
throw SysError(format("cannot connect to daemon at %1%") % socketPath);
|
|
|
|
|
|
|
|
auto nfds = (s > STDIN_FILENO ? s : STDIN_FILENO) + 1;
|
|
|
|
while (true) {
|
|
|
|
fd_set fds;
|
|
|
|
FD_ZERO(&fds);
|
|
|
|
FD_SET(s, &fds);
|
|
|
|
FD_SET(STDIN_FILENO, &fds);
|
|
|
|
if (select(nfds, &fds, nullptr, nullptr, nullptr) == -1)
|
|
|
|
throw SysError("waiting for data from client or server");
|
|
|
|
if (FD_ISSET(s, &fds)) {
|
2017-02-13 13:06:46 +00:00
|
|
|
auto res = splice(s, nullptr, STDOUT_FILENO, nullptr, SSIZE_MAX, SPLICE_F_MOVE);
|
2016-09-02 17:30:28 +00:00
|
|
|
if (res == -1)
|
|
|
|
throw SysError("splicing data from daemon socket to stdout");
|
|
|
|
else if (res == 0)
|
|
|
|
throw EndOfFile("unexpected EOF from daemon socket");
|
|
|
|
}
|
|
|
|
if (FD_ISSET(STDIN_FILENO, &fds)) {
|
2017-02-13 13:06:46 +00:00
|
|
|
auto res = splice(STDIN_FILENO, nullptr, s, nullptr, SSIZE_MAX, SPLICE_F_MOVE);
|
2016-09-02 17:30:28 +00:00
|
|
|
if (res == -1)
|
|
|
|
throw SysError("splicing data from stdin to daemon socket");
|
|
|
|
else if (res == 0)
|
2018-10-26 09:35:46 +00:00
|
|
|
return 0;
|
2016-09-02 17:30:28 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
2018-09-24 11:53:44 +00:00
|
|
|
FdSource from(STDIN_FILENO);
|
|
|
|
FdSink to(STDOUT_FILENO);
|
|
|
|
processConnection(from, to, true, "root", 0);
|
2016-09-02 17:30:28 +00:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
daemonLoop(argv);
|
|
|
|
}
|
2018-10-26 09:35:46 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2006-11-30 19:19:59 +00:00
|
|
|
}
|
2018-10-26 09:35:46 +00:00
|
|
|
|
|
|
|
static RegisterLegacyCommand s1("nix-daemon", _main);
|