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remote.c
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/*
* remote.c - remote control for the NSD daemon.
*
* Copyright (c) 2008, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains the remote control functionality for the daemon.
* The remote control can be performed using either the commandline
* nsd-control tool, or a TLS capable web browser.
* The channel is secured using TLSv1, and certificates.
* Both the server and the client(control tool) have their own keys.
*/
#include "config.h"
#ifdef HAVE_SSL
#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#endif
#ifdef HAVE_OPENSSL_ERR_H
#include <openssl/err.h>
#endif
#ifdef HAVE_OPENSSL_RAND_H
#include <openssl/rand.h>
#endif
#endif /* HAVE_SSL */
#include <ctype.h>
#include <unistd.h>
#include <assert.h>
#include <fcntl.h>
#include <errno.h>
#ifndef USE_MINI_EVENT
# ifdef HAVE_EVENT_H
# include <event.h>
# else
# include <event2/event.h>
# include "event2/event_struct.h"
# include "event2/event_compat.h"
# endif
#else
# include "mini_event.h"
#endif
#include "util.h"
#include "xfrd.h"
#include "xfrd-catalog-zones.h"
#include "xfrd-notify.h"
#include "xfrd-tcp.h"
#include "nsd.h"
#include "options.h"
#include "difffile.h"
#include "ipc.h"
#include "remote.h"
#ifdef USE_METRICS
#include "metrics.h"
#endif /* USE_METRICS */
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_SYS_UN_H
# include <sys/un.h>
#endif
#ifndef AF_LOCAL
#define AF_LOCAL AF_UNIX
#endif
/** number of seconds timeout on incoming remote control handshake */
#define REMOTE_CONTROL_TCP_TIMEOUT 120
/** repattern to master or slave */
#define REPAT_SLAVE 1
#define REPAT_MASTER 2
#define REPAT_CATALOG_CONSUMER 4
#define REPAT_CATALOG_CONSUMER_DEINIT 8
/** if you want zero to be inhibited in stats output.
* it omits zeroes for types that have no acronym and unused-rcodes */
const int inhibit_zero = 1;
/**
* a busy control command connection, SSL state
* Defined here to keep the definition private, and keep SSL out of the .h
*/
struct rc_state {
/** the next item in list */
struct rc_state* next, *prev;
/* if the event was added to the event_base */
int event_added;
/** the commpoint */
struct event c;
/** timeout for this state */
struct timeval tval;
/** in the handshake part */
enum { rc_none, rc_hs_read, rc_hs_write } shake_state;
#ifdef HAVE_SSL
/** the ssl state */
SSL* ssl;
#endif
/** file descriptor */
int fd;
/** the rc this is part of */
struct daemon_remote* rc;
/** stats list next item */
struct rc_state* stats_next;
};
/**
* list of events for accepting connections
*/
struct acceptlist {
struct acceptlist* next;
int event_added;
struct event c;
char* ident;
struct daemon_remote* rc;
};
/**
* The remote control state.
*/
struct daemon_remote {
/** the master process for this remote control */
struct xfrd_state* xfrd;
/** commpoints for accepting remote control connections */
struct acceptlist* accept_list;
/* if certificates are used */
int use_cert;
/** number of active commpoints that are handling remote control */
int active;
/** max active commpoints */
int max_active;
/** current commpoints busy; double linked, malloced */
struct rc_state* busy_list;
/** last time stats was reported */
struct timeval stats_time, boot_time;
#ifdef HAVE_SSL
/** the SSL context for creating new SSL streams */
SSL_CTX* ctx;
#endif
};
/**
* Connection to print to, either SSL or plain over fd
*/
struct remote_stream {
#ifdef HAVE_SSL
/** SSL structure, nonNULL if using SSL */
SSL* ssl;
#endif
/** file descriptor for plain transfer */
int fd;
};
typedef struct remote_stream RES;
/**
* Print fixed line of text over ssl connection in blocking mode
* @param res: print to
* @param text: the text.
* @return false on connection failure.
*/
static int ssl_print_text(RES* res, const char* text);
/**
* printf style printing to the ssl connection
* @param res: the RES connection to print to. Blocking.
* @param format: printf style format string.
* @return success or false on a network failure.
*/
static int ssl_printf(RES* res, const char* format, ...)
ATTR_FORMAT(printf, 2, 3);
/**
* Read until \n is encountered
* If stream signals EOF, the string up to then is returned (without \n).
* @param res: the RES connection to read from. blocking.
* @param buf: buffer to read to.
* @param max: size of buffer.
* @return false on connection failure.
*/
static int ssl_read_line(RES* res, char* buf, size_t max);
/** perform the accept of a new remote control connection */
static void
remote_accept_callback(int fd, short event, void* arg);
/** perform remote control */
static void
remote_control_callback(int fd, short event, void* arg);
/** ---- end of private defines ---- **/
#ifdef HAVE_SSL
/** log ssl crypto err */
static void
log_crypto_err(const char* str)
{
/* error:[error code]:[library name]:[function name]:[reason string] */
char buf[128];
unsigned long e;
ERR_error_string_n(ERR_get_error(), buf, sizeof(buf));
log_msg(LOG_ERR, "%s crypto %s", str, buf);
while( (e=ERR_get_error()) ) {
ERR_error_string_n(e, buf, sizeof(buf));
log_msg(LOG_ERR, "and additionally crypto %s", buf);
}
}
#endif /* HAVE_SSL */
#ifdef BIND8_STATS
/** subtract timers and the values do not overflow or become negative */
void
timeval_subtract(struct timeval* d, const struct timeval* end,
const struct timeval* start)
{
#ifndef S_SPLINT_S
time_t end_usec = end->tv_usec;
d->tv_sec = end->tv_sec - start->tv_sec;
if(end_usec < start->tv_usec) {
end_usec += 1000000;
d->tv_sec--;
}
d->tv_usec = end_usec - start->tv_usec;
#endif
}
#endif /* BIND8_STATS */
#ifdef HAVE_SSL
static int
remote_setup_ctx(struct daemon_remote* rc, struct nsd_options* cfg)
{
char* s_cert = cfg->server_cert_file;
char* s_key = cfg->server_key_file;
rc->ctx = server_tls_ctx_setup(s_key, s_cert, s_cert);
if(!rc->ctx) {
log_msg(LOG_ERR, "could not setup remote control TLS context");
return 0;
}
return 1;
}
#endif /* HAVE_SSL */
struct daemon_remote*
daemon_remote_create(struct nsd_options* cfg)
{
struct daemon_remote* rc = (struct daemon_remote*)xalloc_zero(
sizeof(*rc));
rc->max_active = 10;
assert(cfg->control_enable);
if(options_remote_is_address(cfg)) {
#ifdef HAVE_SSL
if(!remote_setup_ctx(rc, cfg)) {
daemon_remote_delete(rc);
return NULL;
}
rc->use_cert = 1;
#else
log_msg(LOG_ERR, "Could not setup remote control: NSD was compiled without SSL.");
#endif /* HAVE_SSL */
} else {
struct ip_address_option* o;
#ifdef HAVE_SSL
rc->ctx = NULL;
#endif
rc->use_cert = 0;
for(o = cfg->control_interface; o; o = o->next) {
if(o->address && o->address[0] != '/')
log_msg(LOG_WARNING, "control-interface %s is not using TLS, but plain transfer, because first control-interface in config file is a local socket (starts with a /).", o->address);
}
}
/* and try to open the ports */
if(!daemon_remote_open_ports(rc, cfg)) {
log_msg(LOG_ERR, "could not open remote control port");
daemon_remote_delete(rc);
return NULL;
}
if(gettimeofday(&rc->boot_time, NULL) == -1)
log_msg(LOG_ERR, "gettimeofday: %s", strerror(errno));
rc->stats_time = rc->boot_time;
return rc;
}
void daemon_remote_close(struct daemon_remote* rc)
{
struct rc_state* p, *np;
struct acceptlist* h, *nh;
if(!rc) return;
/* close listen sockets */
h = rc->accept_list;
while(h) {
nh = h->next;
if(h->event_added)
event_del(&h->c);
close(h->c.ev_fd);
free(h->ident);
free(h);
h = nh;
}
rc->accept_list = NULL;
/* close busy connection sockets */
p = rc->busy_list;
while(p) {
np = p->next;
if(p->event_added)
event_del(&p->c);
#ifdef HAVE_SSL
if(p->ssl)
SSL_free(p->ssl);
#endif
close(p->c.ev_fd);
free(p);
p = np;
}
rc->busy_list = NULL;
rc->active = 0;
}
void daemon_remote_delete(struct daemon_remote* rc)
{
if(!rc) return;
daemon_remote_close(rc);
#ifdef HAVE_SSL
if(rc->ctx) {
SSL_CTX_free(rc->ctx);
}
#endif
free(rc);
}
static int
create_tcp_accept_sock(struct addrinfo* addr, int* noproto)
{
#if defined(SO_REUSEADDR) || (defined(INET6) && (defined(IPV6_V6ONLY) || defined(IPV6_USE_MIN_MTU) || defined(IPV6_MTU)))
int on = 1;
#endif
int s;
*noproto = 0;
if ((s = socket(addr->ai_family, addr->ai_socktype, 0)) == -1) {
#if defined(INET6)
if (addr->ai_family == AF_INET6 &&
errno == EAFNOSUPPORT) {
*noproto = 1;
log_msg(LOG_WARNING, "fallback to TCP4, no IPv6: not supported");
return -1;
}
#endif /* INET6 */
log_msg(LOG_ERR, "can't create a socket: %s", strerror(errno));
return -1;
}
#ifdef SO_REUSEADDR
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) {
log_msg(LOG_ERR, "setsockopt(..., SO_REUSEADDR, ...) failed: %s", strerror(errno));
}
#endif /* SO_REUSEADDR */
#if defined(INET6) && defined(IPV6_V6ONLY)
if (addr->ai_family == AF_INET6 &&
setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
{
log_msg(LOG_ERR, "setsockopt(..., IPV6_V6ONLY, ...) failed: %s", strerror(errno));
close(s);
return -1;
}
#endif
/* set it nonblocking */
/* (StevensUNP p463), if tcp listening socket is blocking, then
it may block in accept, even if select() says readable. */
if (fcntl(s, F_SETFL, O_NONBLOCK) == -1) {
log_msg(LOG_ERR, "cannot fcntl tcp: %s", strerror(errno));
}
/* Bind it... */
if (bind(s, (struct sockaddr *)addr->ai_addr, addr->ai_addrlen) != 0) {
log_msg(LOG_ERR, "can't bind tcp socket: %s", strerror(errno));
close(s);
return -1;
}
/* Listen to it... */
if (listen(s, TCP_BACKLOG_REMOTE) == -1) {
log_msg(LOG_ERR, "can't listen: %s", strerror(errno));
close(s);
return -1;
}
return s;
}
/**
* Add and open a new control port
* @param rc: rc with result list.
* @param ip: ip str
* @param nr: port nr
* @param noproto_is_err: if lack of protocol support is an error.
* @return false on failure.
*/
static int
add_open(struct daemon_remote* rc, struct nsd_options* cfg, const char* ip,
int nr, int noproto_is_err)
{
struct addrinfo hints;
struct addrinfo* res;
struct acceptlist* hl;
int noproto = 0;
int fd, r;
char port[15];
snprintf(port, sizeof(port), "%d", nr);
port[sizeof(port)-1]=0;
memset(&hints, 0, sizeof(hints));
assert(ip);
if(ip[0] == '/') {
/* This looks like a local socket */
fd = create_local_accept_sock(ip, &noproto);
/*
* Change socket ownership and permissions so users other
* than root can access it provided they are in the same
* group as the user we run as.
*/
if(fd != -1) {
#ifdef HAVE_CHOWN
if(chmod(ip, (mode_t)(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)) == -1) {
VERBOSITY(3, (LOG_INFO, "cannot chmod control socket %s: %s", ip, strerror(errno)));
}
if (cfg->username && cfg->username[0] &&
nsd.uid != (uid_t)-1) {
if(chown(ip, nsd.uid, nsd.gid) == -1)
VERBOSITY(2, (LOG_INFO, "cannot chown %u.%u %s: %s",
(unsigned)nsd.uid, (unsigned)nsd.gid,
ip, strerror(errno)));
}
#else
(void)cfg;
#endif
}
} else {
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
/* if we had no interface ip name, "default" is what we
* would do getaddrinfo for. */
if((r = getaddrinfo(ip, port, &hints, &res)) != 0 || !res) {
log_msg(LOG_ERR, "control interface %s:%s getaddrinfo: %s %s",
ip, port, gai_strerror(r),
#ifdef EAI_SYSTEM
r==EAI_SYSTEM?(char*)strerror(errno):""
#else
""
#endif
);
return 0;
}
/* open fd */
fd = create_tcp_accept_sock(res, &noproto);
freeaddrinfo(res);
}
if(fd == -1 && noproto) {
if(!noproto_is_err)
return 1; /* return success, but do nothing */
log_msg(LOG_ERR, "cannot open control interface %s %d : "
"protocol not supported", ip, nr);
return 0;
}
if(fd == -1) {
log_msg(LOG_ERR, "cannot open control interface %s %d", ip, nr);
return 0;
}
/* alloc */
hl = (struct acceptlist*)xalloc_zero(sizeof(*hl));
hl->rc = rc;
hl->ident = strdup(ip);
if(!hl->ident) {
log_msg(LOG_ERR, "malloc failure");
close(fd);
free(hl);
return 0;
}
hl->next = rc->accept_list;
rc->accept_list = hl;
hl->c.ev_fd = fd;
hl->event_added = 0;
return 1;
}
int
daemon_remote_open_ports(struct daemon_remote* rc, struct nsd_options* cfg)
{
assert(cfg->control_enable && cfg->control_port);
if(cfg->control_interface) {
ip_address_option_type* p;
for(p = cfg->control_interface; p; p = p->next) {
if(!add_open(rc, cfg, p->address, cfg->control_port, 1)) {
return 0;
}
}
} else {
/* defaults */
if(cfg->do_ip6 && !add_open(rc, cfg, "::1", cfg->control_port, 0)) {
return 0;
}
if(cfg->do_ip4 &&
!add_open(rc, cfg, "127.0.0.1", cfg->control_port, 1)) {
return 0;
}
}
return 1;
}
void
daemon_remote_attach(struct daemon_remote* rc, struct xfrd_state* xfrd)
{
int fd;
struct acceptlist* p;
if(!rc) return;
rc->xfrd = xfrd;
for(p = rc->accept_list; p; p = p->next) {
/* add event */
fd = p->c.ev_fd;
memset(&p->c, 0, sizeof(p->c));
event_set(&p->c, fd, EV_PERSIST|EV_READ, remote_accept_callback,
p);
if(event_base_set(xfrd->event_base, &p->c) != 0)
log_msg(LOG_ERR, "remote: cannot set event_base");
if(event_add(&p->c, NULL) != 0)
log_msg(LOG_ERR, "remote: cannot add event");
p->event_added = 1;
}
}
static void
remote_accept_callback(int fd, short event, void* arg)
{
struct acceptlist *hl = (struct acceptlist*)arg;
struct daemon_remote *rc = hl->rc;
#ifdef INET6
struct sockaddr_storage addr;
#else
struct sockaddr_in addr;
#endif
socklen_t addrlen;
int newfd;
struct rc_state* n;
if (!(event & EV_READ)) {
return;
}
/* perform the accept */
addrlen = sizeof(addr);
#ifndef HAVE_ACCEPT4
newfd = accept(fd, (struct sockaddr*)&addr, &addrlen);
#else
newfd = accept4(fd, (struct sockaddr*)&addr, &addrlen, SOCK_NONBLOCK);
#endif
if(newfd == -1) {
if ( errno != EINTR
&& errno != EWOULDBLOCK
#ifdef ECONNABORTED
&& errno != ECONNABORTED
#endif /* ECONNABORTED */
#ifdef EPROTO
&& errno != EPROTO
#endif /* EPROTO */
) {
log_msg(LOG_ERR, "accept failed: %s", strerror(errno));
}
return;
}
/* create new commpoint unless we are servicing already */
if(rc->active >= rc->max_active) {
log_msg(LOG_WARNING, "drop incoming remote control: "
"too many connections");
close_exit:
close(newfd);
return;
}
#ifndef HAVE_ACCEPT4
if (fcntl(newfd, F_SETFL, O_NONBLOCK) == -1) {
log_msg(LOG_ERR, "fcntl failed: %s", strerror(errno));
goto close_exit;
}
#endif
/* setup state to service the remote control command */
n = (struct rc_state*)calloc(1, sizeof(*n));
if(!n) {
log_msg(LOG_ERR, "out of memory");
goto close_exit;
}
n->tval.tv_sec = REMOTE_CONTROL_TCP_TIMEOUT;
n->tval.tv_usec = 0L;
n->fd = newfd;
memset(&n->c, 0, sizeof(n->c));
event_set(&n->c, newfd, EV_PERSIST|EV_TIMEOUT|EV_READ,
remote_control_callback, n);
if(event_base_set(xfrd->event_base, &n->c) != 0) {
log_msg(LOG_ERR, "remote_accept: cannot set event_base");
free(n);
goto close_exit;
}
if(event_add(&n->c, &n->tval) != 0) {
log_msg(LOG_ERR, "remote_accept: cannot add event");
free(n);
goto close_exit;
}
n->event_added = 1;
if(2 <= verbosity) {
if(hl->ident && hl->ident[0] == '/') {
VERBOSITY(2, (LOG_INFO, "new control connection from %s", hl->ident));
} else {
char s[128];
addr2str(&addr, s, sizeof(s));
VERBOSITY(2, (LOG_INFO, "new control connection from %s", s));
}
}
#ifdef HAVE_SSL
if(rc->ctx) {
n->shake_state = rc_hs_read;
n->ssl = SSL_new(rc->ctx);
if(!n->ssl) {
log_crypto_err("could not SSL_new");
if(n->event_added)
event_del(&n->c);
free(n);
goto close_exit;
}
SSL_set_accept_state(n->ssl);
(void)SSL_set_mode(n->ssl, SSL_MODE_AUTO_RETRY);
if(!SSL_set_fd(n->ssl, newfd)) {
log_crypto_err("could not SSL_set_fd");
if(n->event_added)
event_del(&n->c);
SSL_free(n->ssl);
free(n);
goto close_exit;
}
} else {
n->ssl = NULL;
}
#endif /* HAVE_SSL */
n->rc = rc;
n->stats_next = NULL;
n->prev = NULL;
n->next = rc->busy_list;
if(n->next) n->next->prev = n;
rc->busy_list = n;
rc->active ++;
/* perform the first nonblocking read already, for windows,
* so it can return wouldblock. could be faster too. */
remote_control_callback(newfd, EV_READ, n);
}
/** delete from list */
static void
state_list_remove_elem(struct rc_state** list, struct rc_state* todel)
{
if(todel->prev) todel->prev->next = todel->next;
else *list = todel->next;
if(todel->next) todel->next->prev = todel->prev;
}
/** decrease active count and remove commpoint from busy list */
static void
clean_point(struct daemon_remote* rc, struct rc_state* s)
{
state_list_remove_elem(&rc->busy_list, s);
rc->active --;
if(s->event_added)
event_del(&s->c);
#ifdef HAVE_SSL
if(s->ssl) {
SSL_shutdown(s->ssl);
SSL_free(s->ssl);
}
#endif /* HAVE_SSL */
close(s->c.ev_fd);
free(s);
}
static int
ssl_print_text(RES* res, const char* text)
{
if(!res)
return 0;
#ifdef HAVE_SSL
if(res->ssl) {
int r;
ERR_clear_error();
if((r=SSL_write(res->ssl, text, (int)strlen(text))) <= 0) {
if(SSL_get_error(res->ssl, r) == SSL_ERROR_ZERO_RETURN) {
VERBOSITY(2, (LOG_WARNING, "in SSL_write, peer "
"closed connection"));
return 0;
}
log_crypto_err("could not SSL_write");
return 0;
}
} else {
#endif /* HAVE_SSL */
if(write_socket(res->fd, text, strlen(text)) <= 0) {
log_msg(LOG_ERR, "could not write: %s",
strerror(errno));
return 0;
}
#ifdef HAVE_SSL
}
#endif /* HAVE_SSL */
return 1;
}
/** print text over the ssl connection */
static int
ssl_print_vmsg(RES* ssl, const char* format, va_list args)
{
char msg[1024];
vsnprintf(msg, sizeof(msg), format, args);
return ssl_print_text(ssl, msg);
}
/** printf style printing to the ssl connection */
static int
ssl_printf(RES* ssl, const char* format, ...)
{
va_list args;
int ret;
va_start(args, format);
ret = ssl_print_vmsg(ssl, format, args);
va_end(args);
return ret;
}
static int
ssl_read_line(RES* res, char* buf, size_t max)
{
size_t len = 0;
if(!res)
return 0;
while(len < max) {
buf[len] = 0; /* terminate for safety and please checkers */
/* this byte is written if we read a byte from the input */
#ifdef HAVE_SSL
if(res->ssl) {
int r;
ERR_clear_error();
if((r=SSL_read(res->ssl, buf+len, 1)) <= 0) {
if(SSL_get_error(res->ssl, r) == SSL_ERROR_ZERO_RETURN) {
buf[len] = 0;
return 1;
}
log_crypto_err("could not SSL_read");
return 0;
}
} else {
#endif /* HAVE_SSL */
while(1) {
ssize_t rr = read(res->fd, buf+len, 1);
if(rr <= 0) {
if(rr == 0) {
buf[len] = 0;
return 1;
}
if(errno == EINTR || errno == EAGAIN)
continue;
log_msg(LOG_ERR, "could not read: %s",
strerror(errno));
return 0;
}
break;
}
#ifdef HAVE_SSL
}
#endif /* HAVE_SSL */
if(buf[len] == '\n') {
/* return string without \n */
buf[len] = 0;
return 1;
}
len++;
}
buf[max-1] = 0;
log_msg(LOG_ERR, "control line too long (%d): %s", (int)max, buf);
return 0;
}
/** skip whitespace, return new pointer into string */
static char*
skipwhite(char* str)
{
/* EOS \0 is not a space */
while( isspace((unsigned char)*str) )
str++;
return str;
}
/** send the OK to the control client */
static void
send_ok(RES* ssl)
{
(void)ssl_printf(ssl, "ok\n");
}
/** get zone argument (if any) or NULL, false on error */
static int
get_zone_arg(RES* ssl, xfrd_state_type* xfrd, char* arg,
struct zone_options** zo)
{
const dname_type* dname;
if(!arg[0]) {
/* no argument present, return NULL */
*zo = NULL;
return 1;
}
dname = dname_parse(xfrd->region, arg);
if(!dname) {
(void)ssl_printf(ssl, "error cannot parse zone name '%s'\n", arg);
*zo = NULL;
return 0;
}
*zo = zone_options_find(xfrd->nsd->options, dname);
region_recycle(xfrd->region, (void*)dname, dname_total_size(dname));
if(!*zo) {
(void)ssl_printf(ssl, "error zone %s not configured\n", arg);
return 0;
}
return 1;
}
/** do the stop command */
static void
do_stop(RES* ssl, xfrd_state_type* xfrd)
{
xfrd->need_to_send_shutdown = 1;
if(!(xfrd->ipc_handler_flags&EV_WRITE)) {
ipc_xfrd_set_listening(xfrd, EV_PERSIST|EV_READ|EV_WRITE);
}
send_ok(ssl);
}
/** do the log_reopen command, it only needs reload_now */
static void
do_log_reopen(RES* ssl, xfrd_state_type* xfrd)
{
xfrd_set_reload_now(xfrd);
send_ok(ssl);
}
/** do the reload command */
static void
do_reload(RES* ssl, xfrd_state_type* xfrd, char* arg)
{
struct zone_options* zo;
if(!get_zone_arg(ssl, xfrd, arg, &zo))
return;
task_new_check_zonefiles(xfrd->nsd->task[xfrd->nsd->mytask],
xfrd->last_task, zo?(const dname_type*)zo->node.key:NULL);
xfrd_set_reload_now(xfrd);
send_ok(ssl);
}
/** do the write command */
static void
do_write(RES* ssl, xfrd_state_type* xfrd, char* arg)
{
struct zone_options* zo;
if(!get_zone_arg(ssl, xfrd, arg, &zo))
return;
task_new_write_zonefiles(xfrd->nsd->task[xfrd->nsd->mytask],
xfrd->last_task, zo?(const dname_type*)zo->node.key:NULL);
xfrd_set_reload_now(xfrd);
send_ok(ssl);
}
/** do the notify command */
static void
do_notify(RES* ssl, xfrd_state_type* xfrd, char* arg)
{
struct zone_options* zo;
if(!get_zone_arg(ssl, xfrd, arg, &zo))
return;
if(zo) {
struct notify_zone* n = (struct notify_zone*)rbtree_search(
xfrd->notify_zones, (const dname_type*)zo->node.key);
if(n) {
xfrd_notify_start(n, xfrd);
send_ok(ssl);
} else {
(void)ssl_printf(ssl, "error zone does not have notify\n");
}
} else {
struct notify_zone* n;
RBTREE_FOR(n, struct notify_zone*, xfrd->notify_zones) {
xfrd_notify_start(n, xfrd);
}
send_ok(ssl);
}
}
/** do the transfer command */
static void
do_transfer(RES* ssl, xfrd_state_type* xfrd, char* arg)
{
struct zone_options* zo;
xfrd_zone_type* zone;
if(!get_zone_arg(ssl, xfrd, arg, &zo))
return;
if(zo) {
zone = (xfrd_zone_type*)rbtree_search(xfrd->zones, (const
dname_type*)zo->node.key);
if(zone) {
xfrd_handle_notify_and_start_xfr(zone, NULL);
send_ok(ssl);
} else {
(void)ssl_printf(ssl, "error zone not secondary\n");
}
} else {
RBTREE_FOR(zone, xfrd_zone_type*, xfrd->zones) {
xfrd_handle_notify_and_start_xfr(zone, NULL);
}
(void)ssl_printf(ssl, "ok, %lu zones\n", (unsigned long)xfrd->zones->count);
}
}
/** force transfer a zone */
static void
force_transfer_zone(xfrd_zone_type* zone)
{
/* if in TCP transaction, stop it immediately. */
if(zone->tcp_conn != -1)
xfrd_tcp_release(xfrd->tcp_set, zone);
else if(zone->zone_handler.ev_fd != -1)
xfrd_udp_release(zone);
/* pretend we not longer have it and force any
* zone to be downloaded (even same serial, w AXFR) */
zone->soa_disk_acquired = 0;
zone->soa_nsd_acquired = 0;
xfrd_handle_notify_and_start_xfr(zone, NULL);
}
/** do the force transfer command */
static void
do_force_transfer(RES* ssl, xfrd_state_type* xfrd, char* arg)
{
struct zone_options* zo;
xfrd_zone_type* zone;
if(!get_zone_arg(ssl, xfrd, arg, &zo))
return;
if(zo) {
zone = (xfrd_zone_type*)rbtree_search(xfrd->zones, (const