116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
#include "file-system.hh"
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#include "processes.hh"
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#include "unix-domain-socket.hh"
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#include "util.hh"
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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namespace nix {
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AutoCloseFD createUnixDomainSocket()
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{
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AutoCloseFD fdSocket = socket(PF_UNIX, SOCK_STREAM
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#ifdef SOCK_CLOEXEC
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| SOCK_CLOEXEC
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#endif
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, 0);
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if (!fdSocket)
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throw SysError("cannot create Unix domain socket");
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closeOnExec(fdSocket.get());
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return fdSocket;
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}
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AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode)
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{
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auto fdSocket = nix::createUnixDomainSocket();
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bind(fdSocket.get(), path);
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if (chmod(path.c_str(), mode) == -1)
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throw SysError("changing permissions on '%1%'", path);
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if (listen(fdSocket.get(), 100) == -1)
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throw SysError("cannot listen on socket '%1%'", path);
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return fdSocket;
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}
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void bind(int fd, const std::string & path)
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{
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unlink(path.c_str());
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struct sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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if (path.size() + 1 >= sizeof(addr.sun_path)) {
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Pid pid = startProcess([&]() {
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Path dir = dirOf(path);
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if (chdir(dir.c_str()) == -1)
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throw SysError("chdir to '%s' failed", dir);
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std::string base(baseNameOf(path));
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if (base.size() + 1 >= sizeof(addr.sun_path))
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throw Error("socket path '%s' is too long", base);
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memcpy(addr.sun_path, base.c_str(), base.size() + 1);
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if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
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throw SysError("cannot bind to socket '%s'", path);
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_exit(0);
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});
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int status = pid.wait();
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if (status != 0)
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throw Error("cannot bind to socket '%s'", path);
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} else {
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memcpy(addr.sun_path, path.c_str(), path.size() + 1);
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if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
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throw SysError("cannot bind to socket '%s'", path);
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}
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}
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void connect(int fd, const std::string & path)
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{
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struct sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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if (path.size() + 1 >= sizeof(addr.sun_path)) {
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Pipe pipe;
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pipe.create();
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Pid pid = startProcess([&]() {
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try {
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pipe.readSide.close();
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Path dir = dirOf(path);
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if (chdir(dir.c_str()) == -1)
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throw SysError("chdir to '%s' failed", dir);
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std::string base(baseNameOf(path));
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if (base.size() + 1 >= sizeof(addr.sun_path))
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throw Error("socket path '%s' is too long", base);
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memcpy(addr.sun_path, base.c_str(), base.size() + 1);
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if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
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throw SysError("cannot connect to socket at '%s'", path);
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writeFull(pipe.writeSide.get(), "0\n");
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} catch (SysError & e) {
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writeFull(pipe.writeSide.get(), fmt("%d\n", e.errNo));
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} catch (...) {
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writeFull(pipe.writeSide.get(), "-1\n");
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}
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});
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pipe.writeSide.close();
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auto errNo = string2Int<int>(chomp(drainFD(pipe.readSide.get())));
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if (!errNo || *errNo == -1)
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throw Error("cannot connect to socket at '%s'", path);
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else if (*errNo > 0) {
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errno = *errNo;
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throw SysError("cannot connect to socket at '%s'", path);
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}
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} else {
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memcpy(addr.sun_path, path.c_str(), path.size() + 1);
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if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
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throw SysError("cannot connect to socket at '%s'", path);
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}
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}
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}
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