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#include <arpa/inet.h>
#include <fcntl.h>
#include <syslog.h>
#include <unistd.h>
#include <libubox/uloop.h>
#include "odhcpd.h"
#define READ_END 0
#define WRITE_END 1
static void update_cb(struct uloop_fd *u, unsigned int events);
static void update_proc_cb(struct uloop_process *c, int ret);
static void update_time_cb(struct uloop_timeout *t);
static int dns_start();
static int dns_update_init();
static ssize_t dns_write(const char *buf, size_t count);
static struct uloop_fd update_in = { .fd = -1, .cb = update_cb };
static struct uloop_fd update_err = { .fd = -1, .cb = update_cb };
static struct uloop_process update_proc = { .cb = update_proc_cb };
static int update_pipes[3][2] = {{-1, -1}, {-1, -1}, {-1, -1}};
static struct uloop_timeout update_time = { .cb = update_time_cb };
static void update_time_cb(struct uloop_timeout *t)
{
const char CMD_QUIT[] = "quit\n";
syslog(LOG_ERR, "update_time");
if (update_pipes[1][WRITE_END] < 0) {
return;
}
dns_write(CMD_QUIT, sizeof(CMD_QUIT));
}
static void update_cb(struct uloop_fd *u, unsigned int events)
{
syslog(LOG_ERR, "update_cb: %d %d", u->fd, events);
// if (events & ULOOP_READ) {
char buf[512];
int len = 0;
if ((len = read(u->fd, buf, sizeof(buf)-1)) > 0) {
buf[len] = 0;
syslog(LOG_ERR, "update_cb: read '%s'", buf);
}
// }
syslog(LOG_ERR, "update_cb: read done");
}
static void update_proc_cb(struct uloop_process *c, int ret)
{
syslog(LOG_ERR, "update_cb: process exit: %d", ret);
uloop_timeout_cancel(&update_time);
c->pid = 0;
uloop_fd_delete(&update_in);
update_in.fd = -1;
uloop_fd_delete(&update_err);
update_err.fd = -1;
close(update_pipes[0][READ_END]);
close(update_pipes[1][WRITE_END]);
close(update_pipes[2][READ_END]);
update_pipes[0][READ_END] = -1;
update_pipes[1][WRITE_END] = -1;
update_pipes[2][READ_END] = -1;
}
static ssize_t dns_write(const char *buf, size_t count)
{
if (update_pipes[1][WRITE_END] < 0) {
if (dns_start() < 0)
return -1;
}
uloop_timeout_set(&update_time, 10 * 1000);
return write(update_pipes[1][WRITE_END], buf, count);
}
int dns_update_rr(const char *hostname, int family, const void *addr)
{
if (!config.nsupdate_domain) {
return 0;
}
if (!hostname) {
syslog(LOG_ERR, "update_cb: no hostname");
return 0;
}
dns_update_init();
char tmp_addr[INET6_ADDRSTRLEN];
inet_ntop(family, addr, tmp_addr, sizeof(tmp_addr));
char buf[512]="";
int res = snprintf(buf, sizeof(buf), "add %s.%s. 3600 %s %s\n", hostname, config.nsupdate_domain, family==AF_INET6?"AAAA":"A", tmp_addr);
// build_nsupdate(name, 'dhcid', build_dhcid(TYPE_HWID, mac))
// build_nsupdate(name, 'dhcid', build_dhcid(TYPE_DUID, duid))
syslog(LOG_ERR, "dns_update_rr: buf=%s", buf);
if (res > 0 && res < (int)sizeof(buf)) {
res = dns_write(buf, strlen(buf));
syslog(LOG_ERR, "dns_update_rr: write %d %zd", res, strlen(buf));
syslog(LOG_ERR, "dns_update_rr: hostname=%s addr=%s", hostname, tmp_addr);
}
return 0;
}
int dns_update_finish()
{
const char CMD[] = "send\n";
int res = dns_write(CMD, strlen(CMD));
syslog(LOG_ERR, "dns_update_finish: write %d %zd", res, strlen(CMD));
return res;
}
int dns_reload()
{
return 0;
}
static int dns_update_init()
{
struct {
const char *name;
const char *value;
} params[] = {
{ "key", config.nsupdate_key },
{ "server", config.nsupdate_server },
{ "zone", config.nsupdate_zone },
{ NULL, NULL },
};
for (int i = 0; params[i].name; i++) {
if (!params[i].value)
continue;
char buf[512];
int len = snprintf(buf, sizeof(buf), "%s %s\n",
params[i].name, params[i].value);
if (len < 0 || len > (int)sizeof(buf))
continue;
syslog(LOG_ERR, "dns_reload: %s=%s", params[i].name, params[i].value);
int res = dns_write(buf, len);
syslog(LOG_ERR, "dns_reload: write %d %d", res, len);
}
return 0;
}
int dns_init()
{
syslog(LOG_ERR, "dns_init");
return -1;
}
static int dns_start()
{
/* if (update_pipes[0] > -1) */
/* close(update_pipes[0]); */
/* if (update_pipes[1] > -1) */
/* close(update_pipes[1]); */
for (int i = 0; i < 3; i++) {
if (pipe2(update_pipes[i], 0) < 0) {
syslog(LOG_ERR, "dns_init: pipe2 failed");
return -1;
}
}
int pid = fork();
switch (pid) {
case 0:
/* child */
syslog(LOG_ERR, "dns_init: child");
dup2(update_pipes[0][WRITE_END], STDOUT_FILENO);
dup2(update_pipes[1][READ_END], STDIN_FILENO);
dup2(update_pipes[2][WRITE_END], STDERR_FILENO);
close(update_pipes[0][READ_END]);
close(update_pipes[1][WRITE_END]);
close(update_pipes[2][READ_END]);
char *argv[2] = {"/root/knsupdate.sh", NULL};
execv(argv[0], argv);
syslog(LOG_ERR, "dns_init: exec error?");
return 0;
case -1:
/* error returned in parent. */
syslog(LOG_ERR, "dns_init: failed");
return -1;
default:
/* parent */
break;
}
syslog(LOG_ERR, "dns_init: parent '%d'", pid);
update_in.fd = update_pipes[0][READ_END];
update_err.fd = update_pipes[2][READ_END];
close(update_pipes[0][WRITE_END]);
close(update_pipes[1][READ_END]);
close(update_pipes[2][WRITE_END]);
update_pipes[0][WRITE_END] = -1;
update_pipes[1][READ_END] = -1;
update_pipes[2][WRITE_END] = -1;
uloop_fd_add(&update_in, ULOOP_READ | ULOOP_BLOCKING);
uloop_fd_add(&update_err, ULOOP_READ | ULOOP_BLOCKING);
update_proc.pid = pid;
uloop_process_add(&update_proc);
//dns_reload();
return 0;
}
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