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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/libsystemd/sd-bus/bus-container.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/libsystemd/sd-bus/bus-container.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-container.c b/src/libsystemd/sd-bus/bus-container.c new file mode 100644 index 0000000..b3c0279 --- /dev/null +++ b/src/libsystemd/sd-bus/bus-container.c @@ -0,0 +1,104 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <fcntl.h> +#include <unistd.h> + +#include "bus-container.h" +#include "bus-internal.h" +#include "bus-socket.h" +#include "fd-util.h" +#include "namespace-util.h" +#include "process-util.h" +#include "string-util.h" +#include "util.h" + +int bus_container_connect_socket(sd_bus *b) { + _cleanup_close_pair_ int pair[2] = { -1, -1 }; + _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; + int r, error_buf = 0; + pid_t child; + ssize_t n; + + assert(b); + assert(b->input_fd < 0); + assert(b->output_fd < 0); + assert(b->nspid > 0 || b->machine); + + if (b->nspid <= 0) { + log_debug("sd-bus: connecting bus%s%s to machine %s...", + b->description ? " " : "", strempty(b->description), b->machine); + + r = container_get_leader(b->machine, &b->nspid); + if (r < 0) + return r; + } else + log_debug("sd-bus: connecting bus%s%s to namespace of PID "PID_FMT"...", + b->description ? " " : "", strempty(b->description), b->nspid); + + r = namespace_open(b->nspid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); + if (r < 0) + return log_debug_errno(r, "Failed to open namespace of PID "PID_FMT": %m", b->nspid); + + b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); + if (b->input_fd < 0) + return log_debug_errno(errno, "Failed to create a socket: %m"); + + b->input_fd = fd_move_above_stdio(b->input_fd); + + b->output_fd = b->input_fd; + + bus_socket_setup(b); + + if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0) + return log_debug_errno(errno, "Failed to create a socket pair: %m"); + + r = namespace_fork("(sd-buscntrns)", "(sd-buscntr)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, + pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); + if (r < 0) + return log_debug_errno(r, "Failed to create namespace for (sd-buscntr): %m"); + if (r == 0) { + pair[0] = safe_close(pair[0]); + + r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size); + if (r < 0) { + /* Try to send error up */ + error_buf = errno; + (void) write(pair[1], &error_buf, sizeof(error_buf)); + _exit(EXIT_FAILURE); + } + + _exit(EXIT_SUCCESS); + } + + pair[1] = safe_close(pair[1]); + + r = wait_for_terminate_and_check("(sd-buscntrns)", child, 0); + if (r < 0) + return r; + bool nonzero_exit_status = r != EXIT_SUCCESS; + + n = read(pair[0], &error_buf, sizeof(error_buf)); + if (n < 0) + return log_debug_errno(errno, "Failed to read error status from (sd-buscntr): %m"); + + if (n > 0) { + if (n != sizeof(error_buf)) + return log_debug_errno(SYNTHETIC_ERRNO(EIO), + "Read error status of unexpected length %zd from (sd-buscntr): %m", n); + + if (error_buf < 0) + return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), + "Got unexpected error status from (sd-buscntr): %m"); + + if (error_buf == EINPROGRESS) + return 1; + + if (error_buf > 0) + return log_debug_errno(error_buf, "(sd-buscntr) failed to connect to D-Bus socket: %m"); + } + + if (nonzero_exit_status) + return -EPROTO; + + return bus_socket_start_auth(b); +} |