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/* SPDX-License-Identifier: ISC */
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include "init.h"
static int setup_env(void)
{
int status = -1;
ssize_t ret;
FILE *fp;
clearenv();
fp = fopen(ENVFILE, "r");
if (fp == NULL) {
perror(ENVFILE);
return -1;
}
do {
char *line = NULL;
size_t n = 0;
errno = 0;
ret = getline(&line, &n, fp);
if (ret < 0) {
if (errno == 0) {
status = 0;
} else {
perror(ENVFILE);
}
} else if (ret > 0 && putenv(line) != 0) {
perror("putenv");
ret = -1;
}
free(line);
} while (ret >= 0);
fclose(fp);
return status;
}
static int close_all_files(void)
{
struct dirent *ent;
int fd, n;
DIR *dir;
dir = opendir(PROCFDDIR);
if (dir == NULL) {
if (errno != ENOENT) {
perror(PROCFDDIR);
return -1;
}
n = sysconf(_SC_OPEN_MAX);
if (n < 0) {
perror("getting maximum file descriptor count");
return -1;
}
for (fd = STDERR_FILENO + 1; fd < n; ++fd)
close(fd);
} else {
while ((ent = readdir(dir)) != NULL) {
if (!isdigit(ent->d_name[0]))
continue;
fd = atoi(ent->d_name);
if (fd == STDIN_FILENO || fd == STDOUT_FILENO ||
fd == STDERR_FILENO) {
continue;
}
close(fd);
}
closedir(dir);
}
return 0;
}
static int setup_tty(const char *tty, bool truncate)
{
int fd;
if (tty == NULL)
return 0;
fd = open(tty, O_RDWR);
if (fd < 0) {
perror(tty);
return -1;
}
if (truncate)
ftruncate(fd, 0);
setsid();
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
close(fd);
return 0;
}
static __attribute__((noreturn)) void argv_exec(exec_t *e)
{
char **argv = alloca(sizeof(char *) * (e->argc + 1)), *ptr;
int i;
for (ptr = e->args, i = 0; i < e->argc; ++i, ptr += strlen(ptr) + 1)
argv[i] = ptr;
argv[i] = NULL;
execvp(argv[0], argv);
perror(argv[0]);
exit(EXIT_FAILURE);
}
static pid_t current_child;
static void runsvc_sighandler(int signo)
{
if (current_child != -1)
kill(current_child, signo);
}
static int run_sequentially(exec_t *list, bool direct_exec_last)
{
pid_t ret, pid;
int status;
current_child = -1;
for (; list != NULL; list = list->next) {
if (list->next == NULL && direct_exec_last)
argv_exec(list);
pid = fork();
if (pid == 0)
argv_exec(list);
if (pid == -1) {
perror("fork");
return EXIT_FAILURE;
}
current_child = pid;
do {
ret = wait(&status);
} while (ret != pid);
current_child = -1;
if (!WIFEXITED(status))
return EXIT_FAILURE;
if (WEXITSTATUS(status) != EXIT_SUCCESS)
return WEXITSTATUS(status);
}
do {
ret = wait(&status);
} while (ret != -1 || errno != ECHILD);
return ret;
}
pid_t runsvc(service_t *svc)
{
struct sigaction act;
pid_t pid;
int ret;
pid = fork();
if (pid == -1)
perror("fork");
if (pid == 0) {
cli(NULL);
memset(&act, 0, sizeof(act));
act.sa_handler = runsvc_sighandler;
sigaction(SIGTERM, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGHUP, &act, NULL);
act.sa_handler = SIG_DFL;
sigaction(SIGCHLD, &act, NULL);
sigaction(SIGUSR1, &act, NULL);
if (setup_env())
exit(EXIT_FAILURE);
if (close_all_files())
exit(EXIT_FAILURE);
if (setup_tty(svc->ctty,
(svc->flags & SVC_FLAG_TRUNCATE_OUT) != 0)) {
exit(EXIT_FAILURE);
}
sti(NULL);
if (svc->flags & SVC_FLAG_SUB_REAPER) {
prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0);
ret = run_sequentially(svc->exec, false);
} else {
ret = run_sequentially(svc->exec, true);
}
exit(ret);
}
return pid;
}
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