mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-24 10:52:50 +07:00
760 lines
22 KiB
C
760 lines
22 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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 <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/prctl.h>
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#include <linux/sched.h>
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#include "execute.h"
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#include "strv.h"
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#include "macro.h"
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#include "util.h"
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#include "log.h"
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#include "ioprio.h"
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#include "securebits.h"
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static int close_fds(int except[], unsigned n_except) {
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DIR *d;
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struct dirent *de;
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int r = 0;
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/* Modifies the fds array! (sorts it) */
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if (!(d = opendir("/proc/self/fd")))
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return -errno;
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while ((de = readdir(d))) {
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int fd;
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if (de->d_name[0] == '.')
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continue;
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if ((r = safe_atoi(de->d_name, &fd)) < 0)
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goto finish;
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if (fd < 3)
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continue;
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if (fd == dirfd(d))
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continue;
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if (except) {
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bool found;
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unsigned i;
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found = false;
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for (i = 0; i < n_except; i++)
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if (except[i] == fd) {
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found = true;
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break;
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}
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if (found)
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continue;
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}
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if ((r = close_nointr(fd)) < 0)
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goto finish;
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}
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finish:
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closedir(d);
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return r;
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}
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static int shift_fds(int fds[], unsigned n_fds) {
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int start, restart_from;
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if (n_fds <= 0)
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return 0;
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assert(fds);
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start = 0;
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for (;;) {
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int i;
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restart_from = -1;
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for (i = start; i < (int) n_fds; i++) {
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int nfd;
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/* Already at right index? */
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if (fds[i] == i+3)
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continue;
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if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
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return -errno;
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assert_se(close_nointr(fds[i]) == 0);
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fds[i] = nfd;
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/* Hmm, the fd we wanted isn't free? Then
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* let's remember that and try again from here*/
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if (nfd != i+3 && restart_from < 0)
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restart_from = i;
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}
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if (restart_from < 0)
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break;
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start = restart_from;
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}
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return 0;
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}
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static int flags_fds(int fds[], unsigned n_fds) {
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unsigned i;
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if (n_fds <= 0)
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return 0;
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assert(fds);
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/* Drops O_NONBLOCK and FD_CLOEXEC from the file flags */
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for (i = 0; i < n_fds; i++) {
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int flags;
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if ((flags = fcntl(fds[i], F_GETFL, 0)) < 0)
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return -errno;
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/* Since we are at it, let's make sure that nobody
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* forgot setting O_NONBLOCK for all our fds */
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if (fcntl(fds[i], F_SETFL, flags &~O_NONBLOCK) < 0)
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return -errno;
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if ((flags = fcntl(fds[i], F_GETFD, 0)) < 0)
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return -errno;
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/* Also make sure nobody forgot O_CLOEXEC for all our
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* fds */
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if (fcntl(fds[i], F_SETFD, flags &~FD_CLOEXEC) < 0)
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return -errno;
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}
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return 0;
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}
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static int replace_null_fd(int fd, int flags) {
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int nfd;
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assert(fd >= 0);
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close_nointr(fd);
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if ((nfd = open("/dev/null", flags|O_NOCTTY)) < 0)
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return -errno;
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if (nfd != fd) {
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close_nointr_nofail(nfd);
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return -EIO;
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}
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return 0;
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}
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static int setup_output(const ExecContext *context, const char *ident) {
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int r;
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assert(context);
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switch (context->output) {
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case EXEC_OUTPUT_CONSOLE:
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return 0;
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case EXEC_OUTPUT_NULL:
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if ((r = replace_null_fd(STDOUT_FILENO, O_WRONLY)) < 0 ||
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(r = replace_null_fd(STDERR_FILENO, O_WRONLY)) < 0)
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return r;
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return 0;
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case EXEC_OUTPUT_KERNEL:
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case EXEC_OUTPUT_SYSLOG: {
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int fd;
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union {
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struct sockaddr sa;
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struct sockaddr_un un;
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} sa;
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close_nointr(STDOUT_FILENO);
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close_nointr(STDERR_FILENO);
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
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return -errno;
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if (fd != STDOUT_FILENO) {
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close_nointr_nofail(fd);
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return -EIO;
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}
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zero(sa);
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sa.sa.sa_family = AF_UNIX;
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strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
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if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
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close_nointr_nofail(fd);
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return -errno;
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}
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if (shutdown(fd, SHUT_RD) < 0) {
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close_nointr_nofail(fd);
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return -errno;
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}
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if ((fd = dup(fd)) < 0) {
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close_nointr_nofail(fd);
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return -errno;
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}
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if (fd != STDERR_FILENO) {
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close_nointr_nofail(fd);
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return -EIO;
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}
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/* We speak a very simple protocol between log server
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* and client: one line for the log destination (kmsg
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* or syslog), followed by the priority field,
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* followed by the process name. Since we replaced
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* stdin/stderr we simple use stdio to write to
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* it. Note that we use stderr, to minimize buffer
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* flushing issues. */
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fprintf(stderr,
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"%s\n"
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"%i\n"
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"%s\n",
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context->output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog",
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context->syslog_priority,
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context->syslog_identifier ? context->syslog_identifier : ident);
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return 0;
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}
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default:
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assert_not_reached("Unknown output type");
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}
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}
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static int setup_input(const ExecContext *context) {
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int r;
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assert(context);
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switch (context->input) {
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case EXEC_INPUT_CONSOLE:
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return 0;
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case EXEC_INPUT_NULL:
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if ((r = replace_null_fd(STDIN_FILENO, O_RDONLY)) < 0)
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return r;
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return 0;
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default:
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assert_not_reached("Unknown input type");
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}
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}
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int exec_spawn(const ExecCommand *command, const ExecContext *context, int *fds, unsigned n_fds, pid_t *ret) {
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pid_t pid;
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assert(command);
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assert(context);
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assert(ret);
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assert(fds || n_fds <= 0);
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log_debug("about to execute %s", command->path);
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if ((pid = fork()) < 0)
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return -errno;
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if (pid == 0) {
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char **e, **f = NULL;
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int i, r;
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sigset_t ss;
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/* child */
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if (sigemptyset(&ss) < 0 ||
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sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
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r = EXIT_SIGNAL_MASK;
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goto fail;
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}
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if (setpgid(0, 0) < 0) {
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r = EXIT_PGID;
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goto fail;
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}
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umask(context->umask);
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if (setup_input(context) < 0) {
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r = EXIT_INPUT;
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goto fail;
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}
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if (setup_output(context, file_name_from_path(command->path)) < 0) {
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r = EXIT_OUTPUT;
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goto fail;
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}
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if (context->oom_adjust_set) {
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char t[16];
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snprintf(t, sizeof(t), "%i", context->oom_adjust);
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char_array_0(t);
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if (write_one_line_file("/proc/self/oom_adj", t) < 0) {
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r = EXIT_OOM_ADJUST;
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goto fail;
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}
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}
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if (context->root_directory)
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if (chroot(context->root_directory) < 0) {
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r = EXIT_CHROOT;
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goto fail;
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}
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if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
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r = EXIT_CHDIR;
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goto fail;
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}
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if (context->nice_set)
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if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
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r = EXIT_NICE;
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goto fail;
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}
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if (context->cpu_sched_set) {
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struct sched_param param;
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zero(param);
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param.sched_priority = context->cpu_sched_priority;
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if (sched_setscheduler(0, context->cpu_sched_policy |
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(context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), ¶m) < 0) {
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r = EXIT_SETSCHEDULER;
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goto fail;
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}
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}
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if (context->cpu_affinity_set)
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if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) {
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r = EXIT_CPUAFFINITY;
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goto fail;
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}
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if (context->ioprio_set)
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if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
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r = EXIT_IOPRIO;
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goto fail;
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}
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if (context->timer_slack_ns_set)
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if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) {
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r = EXIT_TIMERSLACK;
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goto fail;
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}
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if (close_fds(fds, n_fds) < 0 ||
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shift_fds(fds, n_fds) < 0 ||
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flags_fds(fds, n_fds) < 0) {
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r = EXIT_FDS;
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goto fail;
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}
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for (i = 0; i < RLIMIT_NLIMITS; i++) {
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if (!context->rlimit[i])
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continue;
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if (setrlimit(i, context->rlimit[i]) < 0) {
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r = EXIT_LIMITS;
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goto fail;
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}
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}
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if (context->secure_bits) {
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if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
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r = EXIT_SECUREBITS;
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goto fail;
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}
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}
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if (n_fds > 0) {
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char a[64], b[64];
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char *listen_env[3] = {
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a,
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b,
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NULL
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};
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snprintf(a, sizeof(a), "LISTEN_PID=%llu", (unsigned long long) getpid());
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snprintf(b, sizeof(b), "LISTEN_FDS=%u", n_fds);
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a[sizeof(a)-1] = 0;
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b[sizeof(b)-1] = 0;
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if (context->environment) {
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if (!(f = strv_merge(listen_env, context->environment))) {
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r = EXIT_MEMORY;
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goto fail;
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}
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e = f;
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} else
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e = listen_env;
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} else
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e = context->environment;
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execve(command->path, command->argv, e);
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r = EXIT_EXEC;
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fail:
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strv_free(f);
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_exit(r);
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}
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log_debug("executed %s as %llu", command->path, (unsigned long long) pid);
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*ret = pid;
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return 0;
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}
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void exec_context_init(ExecContext *c) {
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assert(c);
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c->umask = 0002;
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c->oom_adjust = 0;
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c->oom_adjust_set = false;
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c->nice = 0;
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c->nice_set = false;
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c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
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c->ioprio_set = false;
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c->cpu_sched_policy = SCHED_OTHER;
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c->cpu_sched_priority = 0;
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c->cpu_sched_set = false;
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CPU_ZERO(&c->cpu_affinity);
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c->cpu_affinity_set = false;
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c->input = 0;
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c->output = 0;
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c->syslog_priority = LOG_DAEMON|LOG_INFO;
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c->secure_bits = 0;
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c->capability_bounding_set_drop = 0;
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}
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void exec_context_done(ExecContext *c) {
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unsigned l;
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assert(c);
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strv_free(c->environment);
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c->environment = NULL;
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for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
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free(c->rlimit[l]);
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c->rlimit[l] = NULL;
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}
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free(c->working_directory);
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c->working_directory = NULL;
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free(c->root_directory);
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c->root_directory = NULL;
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free(c->syslog_identifier);
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c->syslog_identifier = NULL;
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free(c->user);
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c->user = NULL;
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free(c->group);
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c->group = NULL;
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strv_free(c->supplementary_groups);
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c->supplementary_groups = NULL;
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if (c->capabilities) {
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cap_free(c->capabilities);
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c->capabilities = NULL;
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}
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}
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void exec_command_free_list(ExecCommand *c) {
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ExecCommand *i;
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while ((i = c)) {
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LIST_REMOVE(ExecCommand, command, c, i);
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free(i->path);
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strv_free(i->argv);
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free(i);
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}
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}
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void exec_command_free_array(ExecCommand **c, unsigned n) {
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unsigned i;
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for (i = 0; i < n; i++) {
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exec_command_free_list(c[i]);
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c[i] = NULL;
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}
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}
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void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
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char ** e;
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unsigned i;
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assert(c);
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assert(f);
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if (!prefix)
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prefix = "";
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fprintf(f,
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"%sUMask: %04o\n"
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"%sWorkingDirectory: %s\n"
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"%sRootDirectory: %s\n",
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prefix, c->umask,
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prefix, c->working_directory ? c->working_directory : "/",
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prefix, c->root_directory ? c->root_directory : "/");
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if (c->environment)
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for (e = c->environment; *e; e++)
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fprintf(f, "%sEnvironment: %s\n", prefix, *e);
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if (c->nice_set)
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fprintf(f,
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"%sNice: %i\n",
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prefix, c->nice);
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if (c->oom_adjust_set)
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fprintf(f,
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"%sOOMAdjust: %i\n",
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prefix, c->oom_adjust);
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for (i = 0; i < RLIM_NLIMITS; i++)
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if (c->rlimit[i])
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fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
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if (c->ioprio_set)
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fprintf(f,
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"%sIOSchedulingClass: %s\n"
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"%sIOPriority: %i\n",
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prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
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prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
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|
|
if (c->cpu_sched_set)
|
|
fprintf(f,
|
|
"%sCPUSchedulingPolicy: %s\n"
|
|
"%sCPUSchedulingPriority: %i\n"
|
|
"%sCPUSchedulingResetOnFork: %s\n",
|
|
prefix, sched_policy_to_string(c->cpu_sched_policy),
|
|
prefix, c->cpu_sched_priority,
|
|
prefix, yes_no(c->cpu_sched_reset_on_fork));
|
|
|
|
if (c->cpu_affinity_set) {
|
|
fprintf(f, "%sCPUAffinity:", prefix);
|
|
for (i = 0; i < CPU_SETSIZE; i++)
|
|
if (CPU_ISSET(i, &c->cpu_affinity))
|
|
fprintf(f, " %i", i);
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (c->timer_slack_ns_set)
|
|
fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns);
|
|
|
|
fprintf(f,
|
|
"%sInput: %s\n"
|
|
"%sOutput: %s\n",
|
|
prefix, exec_input_to_string(c->input),
|
|
prefix, exec_output_to_string(c->output));
|
|
|
|
if (c->output == EXEC_OUTPUT_SYSLOG || c->output == EXEC_OUTPUT_KERNEL)
|
|
fprintf(f,
|
|
"%sSyslogFacility: %s\n"
|
|
"%sSyslogLevel: %s\n",
|
|
prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)),
|
|
prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
|
|
|
|
if (c->capabilities) {
|
|
char *t;
|
|
if ((t = cap_to_text(c->capabilities, NULL))) {
|
|
fprintf(f, "%sCapabilities: %s\n",
|
|
prefix, t);
|
|
cap_free(t);
|
|
}
|
|
}
|
|
|
|
if (c->secure_bits)
|
|
fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
|
|
prefix,
|
|
(c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
|
|
(c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
|
|
(c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
|
|
(c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
|
|
(c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
|
|
(c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
|
|
|
|
if (c->capability_bounding_set_drop) {
|
|
fprintf(f, "%sCapabilityBoundingSetDrop:", prefix);
|
|
|
|
for (i = 0; i <= CAP_LAST_CAP; i++)
|
|
if (c->capability_bounding_set_drop & (1 << i)) {
|
|
char *t;
|
|
|
|
if ((t = cap_to_name(i))) {
|
|
fprintf(f, " %s", t);
|
|
free(t);
|
|
}
|
|
}
|
|
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (c->user)
|
|
fprintf(f, "%sUser: %s", prefix, c->user);
|
|
if (c->group)
|
|
fprintf(f, "%sGroup: %s", prefix, c->group);
|
|
|
|
if (c->supplementary_groups) {
|
|
char **g;
|
|
|
|
fprintf(f, "%sSupplementaryGroups:", prefix);
|
|
|
|
STRV_FOREACH(g, c->supplementary_groups)
|
|
fprintf(f, " %s", *g);
|
|
|
|
fputs("\n", f);
|
|
}
|
|
}
|
|
|
|
void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) {
|
|
assert(s);
|
|
|
|
s->pid = pid;
|
|
s->code = code;
|
|
s->status = status;
|
|
s->timestamp = now(CLOCK_REALTIME);
|
|
}
|
|
|
|
char *exec_command_line(ExecCommand *c) {
|
|
size_t k;
|
|
char *n, *p, **a;
|
|
bool first = true;
|
|
|
|
assert(c);
|
|
assert(c->argv);
|
|
|
|
k = 1;
|
|
STRV_FOREACH(a, c->argv)
|
|
k += strlen(*a)+3;
|
|
|
|
if (!(n = new(char, k)))
|
|
return NULL;
|
|
|
|
p = n;
|
|
STRV_FOREACH(a, c->argv) {
|
|
|
|
if (!first)
|
|
*(p++) = ' ';
|
|
else
|
|
first = false;
|
|
|
|
if (strpbrk(*a, WHITESPACE)) {
|
|
*(p++) = '\'';
|
|
p = stpcpy(p, *a);
|
|
*(p++) = '\'';
|
|
} else
|
|
p = stpcpy(p, *a);
|
|
|
|
}
|
|
|
|
*p = 0;
|
|
|
|
/* FIXME: this doesn't really handle arguments that have
|
|
* spaces and ticks in them */
|
|
|
|
return n;
|
|
}
|
|
|
|
void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
|
|
char *cmd;
|
|
|
|
assert(c);
|
|
assert(f);
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
|
|
cmd = exec_command_line(c);
|
|
|
|
fprintf(f,
|
|
"%sCommand Line: %s\n",
|
|
prefix, cmd ? cmd : strerror(ENOMEM));
|
|
|
|
free(cmd);
|
|
}
|
|
|
|
void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
|
|
assert(f);
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
|
|
LIST_FOREACH(command, c, c)
|
|
exec_command_dump(c, f, prefix);
|
|
}
|
|
|
|
static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
|
|
[EXEC_OUTPUT_CONSOLE] = "console",
|
|
[EXEC_OUTPUT_NULL] = "null",
|
|
[EXEC_OUTPUT_SYSLOG] = "syslog",
|
|
[EXEC_OUTPUT_KERNEL] = "kernel"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
|
|
|
|
static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
|
|
[EXEC_INPUT_NULL] = "null",
|
|
[EXEC_INPUT_CONSOLE] = "console"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
|