101 lines
3 KiB
C
101 lines
3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <fcntl.h>
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#include <unistd.h>
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#include "bus-container.h"
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#include "bus-internal.h"
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#include "bus-socket.h"
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#include "fd-util.h"
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#include "namespace-util.h"
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#include "process-util.h"
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#include "string-util.h"
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#include "util.h"
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int bus_container_connect_socket(sd_bus *b) {
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_cleanup_close_pair_ int pair[2] = { -1, -1 };
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_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
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int r, error_buf = 0;
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pid_t child;
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ssize_t n;
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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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assert(b->nspid > 0 || b->machine);
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if (b->nspid <= 0) {
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log_debug("sd-bus: connecting bus%s%s to machine %s...",
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b->description ? " " : "", strempty(b->description), b->machine);
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r = container_get_leader(b->machine, &b->nspid);
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if (r < 0)
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return r;
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} else
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log_debug("sd-bus: connecting bus%s%s to namespace of PID "PID_FMT"...",
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b->description ? " " : "", strempty(b->description), b->nspid);
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r = namespace_open(b->nspid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
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if (r < 0)
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return r;
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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->input_fd = fd_move_above_stdio(b->input_fd);
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b->output_fd = b->input_fd;
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bus_socket_setup(b);
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if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
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return -errno;
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r = namespace_fork("(sd-buscntrns)", "(sd-buscntr)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG,
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pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child);
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if (r < 0)
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return r;
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if (r == 0) {
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pair[0] = safe_close(pair[0]);
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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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/* Try to send error up */
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error_buf = errno;
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(void) write(pair[1], &error_buf, sizeof(error_buf));
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_exit(EXIT_FAILURE);
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}
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_exit(EXIT_SUCCESS);
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}
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pair[1] = safe_close(pair[1]);
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r = wait_for_terminate_and_check("(sd-buscntrns)", child, 0);
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if (r < 0)
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return r;
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if (r != EXIT_SUCCESS)
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return -EPROTO;
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n = read(pair[0], &error_buf, sizeof(error_buf));
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if (n < 0)
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return -errno;
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if (n > 0) {
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if (n != sizeof(error_buf))
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return -EIO;
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if (error_buf < 0)
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return -EIO;
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if (error_buf == EINPROGRESS)
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return 1;
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if (error_buf > 0)
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return -error_buf;
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}
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return bus_socket_start_auth(b);
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}
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