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/* SPDX-License-Identifier: ISC */
#include <sys/types.h>
#include <sys/wait.h>
#include <stdbool.h>
#include <stddef.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include "service.h"
#include "libcfg.h"
#include "config.h"
#define ENVFILE ETCPATH "/initd.env"
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 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);
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
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 int run_sequentially(exec_t *list)
{
pid_t ret, pid;
int status;
for (; list != NULL; list = list->next) {
if (list->next == NULL)
argv_exec(list);
pid = fork();
if (pid == 0)
argv_exec(list);
if (pid == -1) {
perror("fork");
return EXIT_FAILURE;
}
do {
ret = waitpid(pid, &status, 0);
} while (ret != pid);
if (!WIFEXITED(status))
return EXIT_FAILURE;
if (WEXITSTATUS(status) != EXIT_SUCCESS)
return WEXITSTATUS(status);
}
return EXIT_SUCCESS;
}
/*****************************************************************************/
int main(int argc, char **argv)
{
service_t *svc = NULL;
int dirfd;
if (argc != 3) {
fputs("usage: runsvc <directory> <filename>\n", stderr);
return EXIT_FAILURE;
}
if (getppid() != 1) {
fputs("must be run by init!\n", stderr);
return EXIT_FAILURE;
}
dirfd = open(argv[1], O_RDONLY | O_DIRECTORY);
if (dirfd < 0) {
perror(argv[1]);
return EXIT_FAILURE;
}
svc = rdsvc(dirfd, argv[2], RDSVC_NO_FNAME | RDSVC_NO_DEPS);
close(dirfd);
if (svc == NULL)
return EXIT_FAILURE;
if (setup_env())
return EXIT_FAILURE;
if (setup_tty(svc->ctty, (svc->flags & SVC_FLAG_TRUNCATE_OUT) != 0))
return EXIT_FAILURE;
return run_sequentially(svc->exec);
}
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