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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <error.h>
#include <errno.h>
#include <stdarg.h>
#include <signal.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
#define _(s) s
const char *xgetenv(const char *name, const char *unset) {
const char *val = getenv(name);
if (!val)
val = unset;
return val;
}
char *xasprintf(const char *format, ...) {
va_list arg;
int len;
char *str = NULL;
va_start(arg, format);
len = vasprintf(&str, format, arg);
va_end(arg);
if (len < 0)
error(EXIT_FAILURE, errno, _("Could not allocate memory in vasprintf"));
return str;
}
#define xasprintfa(...) (__extension__ ({ char *heap = xasprintf(__VA_ARGS__); char *stack = strdupa(heap); free(heap); stack; }))
int pid = -1;
void
sigchld_handler(int sig __attribute__((__unused__))) {
int status;
pid = waitpid(pid, &status, WNOHANG);
int exited = WEXITSTATUS(status);
error(exited, 0, "%ld exited with status %d", (long)pid, exited);
exit(0);
}
union addr {
struct sockaddr gen;
struct sockaddr_un un;
};
int new_unix_sock(const char *filename, int type) {
union addr addr;
addr.un.sun_family = AF_UNIX;
strcpy(addr.un.sun_path, filename);
int sock = socket(AF_UNIX, type, 0);
if (sock < 0)
error(EXIT_FAILURE, errno, "socket(%d, %d)", AF_UNIX, type);
unlink(filename);
if (bind(sock, &addr.gen, sizeof(addr)))
error(EXIT_FAILURE, errno, "bind(%d, sockaddr(\"%s\"))", sock, filename);
switch (type) {
case SOCK_STREAM:
case SOCK_SEQPACKET:
if (listen(sock, 5))
error(EXIT_FAILURE, errno, "listen(%d /* \"%s\" */, %d)", sock, filename, 5);
break;
case SOCK_DGRAM:
break;
default:
error(EXIT_FAILURE, errno, "new_unix_sock: Unrecognized type: %d", type);
}
return sock;
}
char *cmdname = "nshd_runner";
const char *notify_sockname = "notify.sock";
const char *nslcd_sockname = "nslcd.sock";
void cleanup(void) {
if (nslcd_sockname)
unlink(nslcd_sockname);
if (notify_sockname)
unlink(notify_sockname);
fprintf(stderr, "%s: Exiting\n", cmdname);
}
int main(int argc, char *argv[]) {
cmdname = argv[0];
if (argc != 2) {
error(2, 0, _("Usage: %s NSHD_PROGRAM"), argv[0]);
}
atexit(&cleanup);
int nslcd_sock = new_unix_sock(nslcd_sockname , SOCK_STREAM);
int notify_sock = new_unix_sock(notify_sockname, SOCK_DGRAM );
struct sigaction act;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
act.sa_handler = sigchld_handler;
if (sigaction(SIGCHLD, &act, 0))
error(EXIT_FAILURE, errno, "sigaction");
pid = fork();
switch (pid) {
case -1:
error(EXIT_FAILURE, errno, "fork");
case 0:
close(notify_sock);
dup2(nslcd_sock, 3);
if (nslcd_sock != 3)
close(nslcd_sock);
pid = getpid();
setenv("LISTEN_PID", xasprintfa("%ld", (long)pid), 1);
setenv("LISTEN_FDS", "1", 1);
setenv("NOTIFY_SOCKET", notify_sockname, 1);
execl(argv[1], argv[1], NULL);
error(EXIT_FAILURE, errno, "execl");
}
while (1) {
union addr client_addr;
socklen_t client_size;
char buf[4097];
ssize_t bytes_read = recvfrom(notify_sock, buf, sizeof(buf)-1, 0, &client_addr.gen, &client_size);
if (bytes_read < 1)
error(EXIT_FAILURE, errno, "recvfrom");
buf[bytes_read] = '\n';
bytes_read++;
ssize_t bytes_written = 0;
while (bytes_written < bytes_read) {
ssize_t n = write(2, &(buf[bytes_written]), bytes_read-bytes_written);
if (n < 0) {
bytes_written = -1;
break;
}
bytes_written += n;
}
if (bytes_written < 0)
error(EXIT_FAILURE, errno, "write");
}
error(EXIT_FAILURE, 0, "not reached");
return EXIT_FAILURE;
}
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