b6741478e7
This adds the new library call sd_journal_open_container() and a new "-M" switch to journalctl. Particular care is taken that journalctl's "-b" switch resolves to the current boot ID of the container, not the host.
128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include <fcntl.h>
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#include "util.h"
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#include "fileio.h"
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#include "bus-internal.h"
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#include "bus-socket.h"
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#include "bus-container.h"
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int bus_container_connect(sd_bus *b) {
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_cleanup_free_ char *s = NULL, *ns = NULL, *root = NULL, *class = NULL;
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_cleanup_close_ int nsfd = -1, rootfd = -1;
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char *p;
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siginfo_t si;
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pid_t leader, child;
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int r;
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assert(b);
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assert(b->input_fd < 0);
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assert(b->output_fd < 0);
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p = strappenda("/run/systemd/machines/", b->machine);
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r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL);
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if (r == -ENOENT)
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return -EHOSTDOWN;
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if (r < 0)
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return r;
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if (!s)
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return -EIO;
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if (!streq_ptr(class, "container"))
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return -EIO;
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r = parse_pid(s, &leader);
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if (r < 0)
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return r;
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if (leader <= 1)
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return -EIO;
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r = asprintf(&ns, "/proc/%lu/ns/mnt", (unsigned long) leader);
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if (r < 0)
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return -ENOMEM;
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nsfd = open(ns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (nsfd < 0)
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return -errno;
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r = asprintf(&root, "/proc/%lu/root", (unsigned long) leader);
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if (r < 0)
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return -ENOMEM;
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rootfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
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if (rootfd < 0)
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return -errno;
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b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (b->input_fd < 0)
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return -errno;
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b->output_fd = b->input_fd;
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r = bus_socket_setup(b);
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if (r < 0)
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return r;
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child = fork();
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if (child < 0)
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return -errno;
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if (child == 0) {
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r = setns(nsfd, CLONE_NEWNS);
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if (r < 0)
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_exit(255);
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if (fchdir(rootfd) < 0)
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_exit(255);
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if (chroot(".") < 0)
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_exit(255);
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r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size);
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if (r < 0) {
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if (errno == EINPROGRESS)
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_exit(1);
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_exit(255);
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}
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_exit(0);
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}
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r = wait_for_terminate(child, &si);
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if (r < 0)
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return r;
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if (si.si_code != CLD_EXITED)
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return -EIO;
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if (si.si_status == 1)
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return 1;
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if (si.si_status != 0)
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return -EIO;
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return bus_socket_start_auth(b);
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}
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