mirror of
https://github.com/systemd/systemd.git
synced 2024-11-14 15:21:37 +03:00
350 lines
8.6 KiB
C
350 lines
8.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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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 "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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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]));
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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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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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char t[16];
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/* child */
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umask(context->umask);
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if (chdir(context->directory ? context->directory : "/") < 0) {
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r = EXIT_CHDIR;
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goto fail;
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}
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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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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 (close_fds(fds, n_fds) < 0 ||
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shift_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 (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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*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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cap_clear(c->capabilities);
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c->oom_adjust = 0;
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c->nice = 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->directory);
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c->directory = 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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}
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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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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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"%sDirectory: %s\n"
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"%sNice: %i\n"
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"%sOOMAdjust: %i\n",
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prefix, c->umask,
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prefix, c->directory ? c->directory : "/",
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prefix, c->nice,
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prefix, c->oom_adjust);
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}
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void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) {
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assert(s);
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s->pid = pid;
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s->code = code;
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s->status = status;
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s->timestamp = now(CLOCK_REALTIME);
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}
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char *exec_command_line(ExecCommand *c) {
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size_t k;
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char *n, *p, **a;
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bool first = true;
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assert(c);
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assert(c->argv);
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k = 1;
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STRV_FOREACH(a, c->argv)
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k += strlen(*a)+3;
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if (!(n = new(char, k)))
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return NULL;
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p = n;
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STRV_FOREACH(a, c->argv) {
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if (!first)
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*(p++) = ' ';
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else
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first = false;
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if (strpbrk(*a, WHITESPACE)) {
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*(p++) = '\'';
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p = stpcpy(p, *a);
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*(p++) = '\'';
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} else
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p = stpcpy(p, *a);
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}
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*p = 0;
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/* FIXME: this doesn't really handle arguments that have
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* spaces and ticks in them */
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return n;
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}
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void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
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char *cmd;
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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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cmd = exec_command_line(c);
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fprintf(f,
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"%sCommand Line: %s\n",
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prefix, cmd ? cmd : strerror(ENOMEM));
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free(cmd);
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}
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void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
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assert(f);
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if (!prefix)
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prefix = "";
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LIST_FOREACH(command, c, c)
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exec_command_dump(c, f, prefix);
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}
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