monero/external/unbound/testcode/delayer.c
Erik de Castro Lopo a85b5759f3 Upgrade unbound library
These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).
2017-06-17 23:04:00 +10:00

1186 lines
30 KiB
C

/*
* testcode/delayer.c - debug program that delays queries to a server.
*
* 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 program delays queries made. It performs as a proxy to another
* server and delays queries to it.
*/
#include "config.h"
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#include <sys/time.h>
#include "util/net_help.h"
#include "util/config_file.h"
#include "sldns/sbuffer.h"
#include <signal.h>
/** number of reads per select for delayer */
#define TRIES_PER_SELECT 100
/**
* The ring buffer
*/
struct ringbuf {
/** base of buffer */
uint8_t* buf;
/** size of buffer */
size_t size;
/** low mark, items start here */
size_t low;
/** high mark, items end here */
size_t high;
};
/**
* List of proxy fds that return replies from the server to our clients.
*/
struct proxy {
/** the fd to listen for replies from server */
int s;
/** last time this was used */
struct timeval lastuse;
/** remote address */
struct sockaddr_storage addr;
/** length of addr */
socklen_t addr_len;
/** number of queries waiting (in total) */
size_t numwait;
/** number of queries sent to server (in total) */
size_t numsent;
/** numberof answers returned to client (in total) */
size_t numreturn;
/** how many times repurposed */
size_t numreuse;
/** next in proxylist */
struct proxy* next;
};
/**
* An item that has to be TCP relayed
*/
struct tcp_send_list {
/** the data item */
uint8_t* item;
/** size of item */
size_t len;
/** time when the item can be transmitted on */
struct timeval wait;
/** how much of the item has already been transmitted */
size_t done;
/** next in list */
struct tcp_send_list* next;
};
/**
* List of TCP proxy fd pairs to TCP connect client to server
*/
struct tcp_proxy {
/** the fd to listen for client query */
int client_s;
/** the fd to listen for server answer */
int server_s;
/** remote client address */
struct sockaddr_storage addr;
/** length of address */
socklen_t addr_len;
/** timeout on this entry */
struct timeval timeout;
/** list of query items to send to server */
struct tcp_send_list* querylist;
/** last in query list */
struct tcp_send_list* querylast;
/** list of answer items to send to client */
struct tcp_send_list* answerlist;
/** last in answerlist */
struct tcp_send_list* answerlast;
/** next in list */
struct tcp_proxy* next;
};
/** usage information for delayer */
static void usage(char* argv[])
{
printf("usage: %s [options]\n", argv[0]);
printf(" -f addr : use addr, forward to that server, @port.\n");
printf(" -b addr : bind to this address to listen.\n");
printf(" -p port : bind to this port (use 0 for random).\n");
printf(" -m mem : use this much memory for waiting queries.\n");
printf(" -d delay: UDP queries are delayed n milliseconds.\n");
printf(" TCP is delayed twice (on send, on recv).\n");
printf(" -h : this help message\n");
exit(1);
}
/** timeval compare, t1 < t2 */
static int
dl_tv_smaller(struct timeval* t1, const struct timeval* t2)
{
#ifndef S_SPLINT_S
if(t1->tv_sec < t2->tv_sec)
return 1;
if(t1->tv_sec == t2->tv_sec &&
t1->tv_usec < t2->tv_usec)
return 1;
#endif
return 0;
}
/** timeval add, t1 += t2 */
static void
dl_tv_add(struct timeval* t1, const struct timeval* t2)
{
#ifndef S_SPLINT_S
t1->tv_sec += t2->tv_sec;
t1->tv_usec += t2->tv_usec;
while(t1->tv_usec > 1000000) {
t1->tv_usec -= 1000000;
t1->tv_sec++;
}
#endif
}
/** timeval subtract, t1 -= t2 */
static void
dl_tv_subtract(struct timeval* t1, const struct timeval* t2)
{
#ifndef S_SPLINT_S
t1->tv_sec -= t2->tv_sec;
if(t1->tv_usec >= t2->tv_usec) {
t1->tv_usec -= t2->tv_usec;
} else {
t1->tv_sec--;
t1->tv_usec = 1000000-(t2->tv_usec-t1->tv_usec);
}
#endif
}
/** create new ring buffer */
static struct ringbuf*
ring_create(size_t sz)
{
struct ringbuf* r = (struct ringbuf*)calloc(1, sizeof(*r));
if(!r) fatal_exit("out of memory");
r->buf = (uint8_t*)malloc(sz);
if(!r->buf) fatal_exit("out of memory");
r->size = sz;
r->low = 0;
r->high = 0;
return r;
}
/** delete ring buffer */
static void
ring_delete(struct ringbuf* r)
{
if(!r) return;
free(r->buf);
free(r);
}
/** add entry to ringbuffer */
static void
ring_add(struct ringbuf* r, sldns_buffer* pkt, struct timeval* now,
struct timeval* delay, struct proxy* p)
{
/* time -- proxy* -- 16bitlen -- message */
uint16_t len = (uint16_t)sldns_buffer_limit(pkt);
struct timeval when;
size_t needed;
uint8_t* where = NULL;
log_assert(sldns_buffer_limit(pkt) <= 65535);
needed = sizeof(when) + sizeof(p) + sizeof(len) + len;
/* put item into ringbuffer */
if(r->low < r->high) {
/* used part is in the middle */
if(r->size - r->high >= needed) {
where = r->buf + r->high;
r->high += needed;
} else if(r->low > needed) {
/* wrap around ringbuffer */
/* make sure r->low == r->high means empty */
/* so r->low == r->high cannot be used to signify
* a completely full ringbuf */
if(r->size - r->high > sizeof(when)+sizeof(p)) {
/* zero entry at end of buffer */
memset(r->buf+r->high, 0,
sizeof(when)+sizeof(p));
}
where = r->buf;
r->high = needed;
} else {
/* drop message */
log_warn("warning: mem full, dropped message");
return;
}
} else {
/* empty */
if(r->high == r->low) {
where = r->buf;
r->low = 0;
r->high = needed;
/* unused part is in the middle */
/* so ringbuffer has wrapped around */
} else if(r->low - r->high > needed) {
where = r->buf + r->high;
r->high += needed;
} else {
log_warn("warning: mem full, dropped message");
return;
}
}
when = *now;
dl_tv_add(&when, delay);
/* copy it at where part */
log_assert(where != NULL);
memmove(where, &when, sizeof(when));
memmove(where+sizeof(when), &p, sizeof(p));
memmove(where+sizeof(when)+sizeof(p), &len, sizeof(len));
memmove(where+sizeof(when)+sizeof(p)+sizeof(len),
sldns_buffer_begin(pkt), len);
}
/** see if the ringbuffer is empty */
static int
ring_empty(struct ringbuf* r)
{
return (r->low == r->high);
}
/** peek at timevalue for next item in ring */
static struct timeval*
ring_peek_time(struct ringbuf* r)
{
if(ring_empty(r))
return NULL;
return (struct timeval*)&r->buf[r->low];
}
/** get entry from ringbuffer */
static int
ring_pop(struct ringbuf* r, sldns_buffer* pkt, struct timeval* tv,
struct proxy** p)
{
/* time -- proxy* -- 16bitlen -- message */
uint16_t len;
uint8_t* where = NULL;
size_t done;
if(r->low == r->high)
return 0;
where = r->buf + r->low;
memmove(tv, where, sizeof(*tv));
memmove(p, where+sizeof(*tv), sizeof(*p));
memmove(&len, where+sizeof(*tv)+sizeof(*p), sizeof(len));
memmove(sldns_buffer_begin(pkt),
where+sizeof(*tv)+sizeof(*p)+sizeof(len), len);
sldns_buffer_set_limit(pkt, (size_t)len);
done = sizeof(*tv)+sizeof(*p)+sizeof(len)+len;
/* move lowmark */
if(r->low < r->high) {
/* used part in middle */
log_assert(r->high - r->low >= done);
r->low += done;
} else {
/* unused part in middle */
log_assert(r->size - r->low >= done);
r->low += done;
if(r->size - r->low > sizeof(*tv)+sizeof(*p)) {
/* see if it is zeroed; means end of buffer */
struct proxy* pz;
memmove(&pz, r->buf+r->low+sizeof(*tv), sizeof(pz));
if(pz == NULL)
r->low = 0;
} else r->low = 0;
}
if(r->low == r->high) {
r->low = 0; /* reset if empty */
r->high = 0;
}
return 1;
}
/** signal handler global info */
static volatile int do_quit = 0;
/** signal handler for user quit */
static RETSIGTYPE delayer_sigh(int sig)
{
printf("exit on signal %d\n", sig);
do_quit = 1;
}
/** send out waiting packets */
static void
service_send(struct ringbuf* ring, struct timeval* now, sldns_buffer* pkt,
struct sockaddr_storage* srv_addr, socklen_t srv_len)
{
struct proxy* p;
struct timeval tv;
ssize_t sent;
while(!ring_empty(ring) &&
dl_tv_smaller(ring_peek_time(ring), now)) {
/* this items needs to be sent out */
if(!ring_pop(ring, pkt, &tv, &p))
fatal_exit("ringbuf error: pop failed");
verbose(1, "send out query %d.%6.6d",
(unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
log_addr(1, "from client", &p->addr, p->addr_len);
/* send it */
sent = sendto(p->s, (void*)sldns_buffer_begin(pkt),
sldns_buffer_limit(pkt), 0,
(struct sockaddr*)srv_addr, srv_len);
if(sent == -1) {
#ifndef USE_WINSOCK
log_err("sendto: %s", strerror(errno));
#else
log_err("sendto: %s", wsa_strerror(WSAGetLastError()));
#endif
} else if(sent != (ssize_t)sldns_buffer_limit(pkt)) {
log_err("sendto: partial send");
}
p->lastuse = *now;
p->numsent++;
}
}
/** do proxy for one readable client */
static void
do_proxy(struct proxy* p, int retsock, sldns_buffer* pkt)
{
int i;
ssize_t r;
for(i=0; i<TRIES_PER_SELECT; i++) {
r = recv(p->s, (void*)sldns_buffer_begin(pkt),
sldns_buffer_capacity(pkt), 0);
if(r == -1) {
#ifndef USE_WINSOCK
if(errno == EAGAIN || errno == EINTR)
return;
log_err("recv: %s", strerror(errno));
#else
if(WSAGetLastError() == WSAEINPROGRESS ||
WSAGetLastError() == WSAEWOULDBLOCK)
return;
log_err("recv: %s", wsa_strerror(WSAGetLastError()));
#endif
return;
}
sldns_buffer_set_limit(pkt, (size_t)r);
log_addr(1, "return reply to client", &p->addr, p->addr_len);
/* send reply back to the real client */
p->numreturn++;
r = sendto(retsock, (void*)sldns_buffer_begin(pkt), (size_t)r,
0, (struct sockaddr*)&p->addr, p->addr_len);
if(r == -1) {
#ifndef USE_WINSOCK
log_err("sendto: %s", strerror(errno));
#else
log_err("sendto: %s", wsa_strerror(WSAGetLastError()));
#endif
}
}
}
/** proxy return replies to clients */
static void
service_proxy(fd_set* rset, int retsock, struct proxy* proxies,
sldns_buffer* pkt, struct timeval* now)
{
struct proxy* p;
for(p = proxies; p; p = p->next) {
if(FD_ISSET(p->s, rset)) {
p->lastuse = *now;
do_proxy(p, retsock, pkt);
}
}
}
/** find or else create proxy for this remote client */
static struct proxy*
find_create_proxy(struct sockaddr_storage* from, socklen_t from_len,
fd_set* rorig, int* max, struct proxy** proxies, int serv_ip6,
struct timeval* now, struct timeval* reuse_timeout)
{
struct proxy* p;
struct timeval t;
for(p = *proxies; p; p = p->next) {
if(sockaddr_cmp(from, from_len, &p->addr, p->addr_len)==0)
return p;
}
/* possibly: reuse lapsed entries */
for(p = *proxies; p; p = p->next) {
if(p->numwait > p->numsent || p->numsent > p->numreturn)
continue;
t = *now;
dl_tv_subtract(&t, &p->lastuse);
if(dl_tv_smaller(&t, reuse_timeout))
continue;
/* yes! */
verbose(1, "reuse existing entry");
memmove(&p->addr, from, from_len);
p->addr_len = from_len;
p->numreuse++;
return p;
}
/* create new */
p = (struct proxy*)calloc(1, sizeof(*p));
if(!p) fatal_exit("out of memory");
p->s = socket(serv_ip6?AF_INET6:AF_INET, SOCK_DGRAM, 0);
if(p->s == -1) {
#ifndef USE_WINSOCK
fatal_exit("socket: %s", strerror(errno));
#else
fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
#endif
}
fd_set_nonblock(p->s);
memmove(&p->addr, from, from_len);
p->addr_len = from_len;
p->next = *proxies;
*proxies = p;
FD_SET(FD_SET_T p->s, rorig);
if(p->s+1 > *max)
*max = p->s+1;
return p;
}
/** recv new waiting packets */
static void
service_recv(int s, struct ringbuf* ring, sldns_buffer* pkt,
fd_set* rorig, int* max, struct proxy** proxies,
struct sockaddr_storage* srv_addr, socklen_t srv_len,
struct timeval* now, struct timeval* delay, struct timeval* reuse)
{
int i;
struct sockaddr_storage from;
socklen_t from_len;
ssize_t len;
struct proxy* p;
for(i=0; i<TRIES_PER_SELECT; i++) {
from_len = (socklen_t)sizeof(from);
len = recvfrom(s, (void*)sldns_buffer_begin(pkt),
sldns_buffer_capacity(pkt), 0,
(struct sockaddr*)&from, &from_len);
if(len < 0) {
#ifndef USE_WINSOCK
if(errno == EAGAIN || errno == EINTR)
return;
fatal_exit("recvfrom: %s", strerror(errno));
#else
if(WSAGetLastError() == WSAEWOULDBLOCK ||
WSAGetLastError() == WSAEINPROGRESS)
return;
fatal_exit("recvfrom: %s",
wsa_strerror(WSAGetLastError()));
#endif
}
sldns_buffer_set_limit(pkt, (size_t)len);
/* find its proxy element */
p = find_create_proxy(&from, from_len, rorig, max, proxies,
addr_is_ip6(srv_addr, srv_len), now, reuse);
if(!p) fatal_exit("error: cannot find or create proxy");
p->lastuse = *now;
ring_add(ring, pkt, now, delay, p);
p->numwait++;
log_addr(1, "recv from client", &p->addr, p->addr_len);
}
}
/** delete tcp proxy */
static void
tcp_proxy_delete(struct tcp_proxy* p)
{
struct tcp_send_list* s, *sn;
if(!p)
return;
log_addr(1, "delete tcp proxy", &p->addr, p->addr_len);
s = p->querylist;
while(s) {
sn = s->next;
free(s->item);
free(s);
s = sn;
}
s = p->answerlist;
while(s) {
sn = s->next;
free(s->item);
free(s);
s = sn;
}
#ifndef USE_WINSOCK
close(p->client_s);
if(p->server_s != -1)
close(p->server_s);
#else
closesocket(p->client_s);
if(p->server_s != -1)
closesocket(p->server_s);
#endif
free(p);
}
/** accept new TCP connections, and set them up */
static void
service_tcp_listen(int s, fd_set* rorig, int* max, struct tcp_proxy** proxies,
struct sockaddr_storage* srv_addr, socklen_t srv_len,
struct timeval* now, struct timeval* tcp_timeout)
{
int newfd;
struct sockaddr_storage addr;
struct tcp_proxy* p;
socklen_t addr_len;
newfd = accept(s, (struct sockaddr*)&addr, &addr_len);
if(newfd == -1) {
#ifndef USE_WINSOCK
if(errno == EAGAIN || errno == EINTR)
return;
fatal_exit("accept: %s", strerror(errno));
#else
if(WSAGetLastError() == WSAEWOULDBLOCK ||
WSAGetLastError() == WSAEINPROGRESS ||
WSAGetLastError() == WSAECONNRESET)
return;
fatal_exit("accept: %s", wsa_strerror(WSAGetLastError()));
#endif
}
p = (struct tcp_proxy*)calloc(1, sizeof(*p));
if(!p) fatal_exit("out of memory");
memmove(&p->addr, &addr, addr_len);
p->addr_len = addr_len;
log_addr(1, "new tcp proxy", &p->addr, p->addr_len);
p->client_s = newfd;
p->server_s = socket(addr_is_ip6(srv_addr, srv_len)?AF_INET6:AF_INET,
SOCK_STREAM, 0);
if(p->server_s == -1) {
#ifndef USE_WINSOCK
fatal_exit("tcp socket: %s", strerror(errno));
#else
fatal_exit("tcp socket: %s", wsa_strerror(WSAGetLastError()));
#endif
}
fd_set_nonblock(p->client_s);
fd_set_nonblock(p->server_s);
if(connect(p->server_s, (struct sockaddr*)srv_addr, srv_len) == -1) {
#ifndef USE_WINSOCK
if(errno != EINPROGRESS) {
log_err("tcp connect: %s", strerror(errno));
close(p->server_s);
close(p->client_s);
#else
if(WSAGetLastError() != WSAEWOULDBLOCK &&
WSAGetLastError() != WSAEINPROGRESS) {
log_err("tcp connect: %s",
wsa_strerror(WSAGetLastError()));
closesocket(p->server_s);
closesocket(p->client_s);
#endif
free(p);
return;
}
}
p->timeout = *now;
dl_tv_add(&p->timeout, tcp_timeout);
/* listen to client and server */
FD_SET(FD_SET_T p->client_s, rorig);
FD_SET(FD_SET_T p->server_s, rorig);
if(p->client_s+1 > *max)
*max = p->client_s+1;
if(p->server_s+1 > *max)
*max = p->server_s+1;
/* add into proxy list */
p->next = *proxies;
*proxies = p;
}
/** relay TCP, read a part */
static int
tcp_relay_read(int s, struct tcp_send_list** first,
struct tcp_send_list** last, struct timeval* now,
struct timeval* delay, sldns_buffer* pkt)
{
struct tcp_send_list* item;
ssize_t r = recv(s, (void*)sldns_buffer_begin(pkt),
sldns_buffer_capacity(pkt), 0);
if(r == -1) {
#ifndef USE_WINSOCK
if(errno == EINTR || errno == EAGAIN)
return 1;
log_err("tcp read: %s", strerror(errno));
#else
if(WSAGetLastError() == WSAEINPROGRESS ||
WSAGetLastError() == WSAEWOULDBLOCK)
return 1;
log_err("tcp read: %s", wsa_strerror(WSAGetLastError()));
#endif
return 0;
} else if(r == 0) {
/* connection closed */
return 0;
}
item = (struct tcp_send_list*)malloc(sizeof(*item));
if(!item) {
log_err("out of memory");
return 0;
}
verbose(1, "read item len %d", (int)r);
item->len = (size_t)r;
item->item = memdup(sldns_buffer_begin(pkt), item->len);
if(!item->item) {
free(item);
log_err("out of memory");
return 0;
}
item->done = 0;
item->wait = *now;
dl_tv_add(&item->wait, delay);
item->next = NULL;
/* link in */
if(*first) {
(*last)->next = item;
} else {
*first = item;
}
*last = item;
return 1;
}
/** relay TCP, write a part */
static int
tcp_relay_write(int s, struct tcp_send_list** first,
struct tcp_send_list** last, struct timeval* now)
{
ssize_t r;
struct tcp_send_list* p;
while(*first) {
p = *first;
/* is the item ready? */
if(!dl_tv_smaller(&p->wait, now))
return 1;
/* write it */
r = send(s, (void*)(p->item + p->done), p->len - p->done, 0);
if(r == -1) {
#ifndef USE_WINSOCK
if(errno == EAGAIN || errno == EINTR)
return 1;
log_err("tcp write: %s", strerror(errno));
#else
if(WSAGetLastError() == WSAEWOULDBLOCK ||
WSAGetLastError() == WSAEINPROGRESS)
return 1;
log_err("tcp write: %s",
wsa_strerror(WSAGetLastError()));
#endif
return 0;
} else if(r == 0) {
/* closed */
return 0;
}
/* account it */
p->done += (size_t)r;
verbose(1, "write item %d of %d", (int)p->done, (int)p->len);
if(p->done >= p->len) {
free(p->item);
*first = p->next;
if(!*first)
*last = NULL;
free(p);
} else {
/* partial write */
return 1;
}
}
return 1;
}
/** perform TCP relaying */
static void
service_tcp_relay(struct tcp_proxy** tcp_proxies, struct timeval* now,
struct timeval* delay, struct timeval* tcp_timeout, sldns_buffer* pkt,
fd_set* rset, fd_set* rorig, fd_set* worig)
{
struct tcp_proxy* p, **prev;
struct timeval tout;
int delete_it;
p = *tcp_proxies;
prev = tcp_proxies;
tout = *now;
dl_tv_add(&tout, tcp_timeout);
while(p) {
delete_it = 0;
/* can we receive further queries? */
if(!delete_it && FD_ISSET(p->client_s, rset)) {
p->timeout = tout;
log_addr(1, "read tcp query", &p->addr, p->addr_len);
if(!tcp_relay_read(p->client_s, &p->querylist,
&p->querylast, now, delay, pkt))
delete_it = 1;
}
/* can we receive further answers? */
if(!delete_it && p->server_s != -1 &&
FD_ISSET(p->server_s, rset)) {
p->timeout = tout;
log_addr(1, "read tcp answer", &p->addr, p->addr_len);
if(!tcp_relay_read(p->server_s, &p->answerlist,
&p->answerlast, now, delay, pkt)) {
#ifndef USE_WINSOCK
close(p->server_s);
#else
closesocket(p->server_s);
#endif
FD_CLR(FD_SET_T p->server_s, worig);
FD_CLR(FD_SET_T p->server_s, rorig);
p->server_s = -1;
}
}
/* can we send on further queries */
if(!delete_it && p->querylist && p->server_s != -1) {
p->timeout = tout;
if(dl_tv_smaller(&p->querylist->wait, now))
log_addr(1, "write tcp query",
&p->addr, p->addr_len);
if(!tcp_relay_write(p->server_s, &p->querylist,
&p->querylast, now))
delete_it = 1;
if(p->querylist && p->server_s != -1 &&
dl_tv_smaller(&p->querylist->wait, now))
FD_SET(FD_SET_T p->server_s, worig);
else FD_CLR(FD_SET_T p->server_s, worig);
}
/* can we send on further answers */
if(!delete_it && p->answerlist) {
p->timeout = tout;
if(dl_tv_smaller(&p->answerlist->wait, now))
log_addr(1, "write tcp answer",
&p->addr, p->addr_len);
if(!tcp_relay_write(p->client_s, &p->answerlist,
&p->answerlast, now))
delete_it = 1;
if(p->answerlist && dl_tv_smaller(&p->answerlist->wait,
now))
FD_SET(FD_SET_T p->client_s, worig);
else FD_CLR(FD_SET_T p->client_s, worig);
if(!p->answerlist && p->server_s == -1)
delete_it = 1;
}
/* does this entry timeout? (unused too long) */
if(dl_tv_smaller(&p->timeout, now)) {
delete_it = 1;
}
if(delete_it) {
struct tcp_proxy* np = p->next;
*prev = np;
FD_CLR(FD_SET_T p->client_s, rorig);
FD_CLR(FD_SET_T p->client_s, worig);
if(p->server_s != -1) {
FD_CLR(FD_SET_T p->server_s, rorig);
FD_CLR(FD_SET_T p->server_s, worig);
}
tcp_proxy_delete(p);
p = np;
continue;
}
prev = &p->next;
p = p->next;
}
}
/** find waiting time */
static int
service_findwait(struct timeval* now, struct timeval* wait,
struct ringbuf* ring, struct tcp_proxy* tcplist)
{
/* first item is the time to wait */
struct timeval* peek = ring_peek_time(ring);
struct timeval tcv;
int have_tcpval = 0;
struct tcp_proxy* p;
/* also for TCP list the first in sendlists is the time to wait */
for(p=tcplist; p; p=p->next) {
if(!have_tcpval)
tcv = p->timeout;
have_tcpval = 1;
if(dl_tv_smaller(&p->timeout, &tcv))
tcv = p->timeout;
if(p->querylist && dl_tv_smaller(&p->querylist->wait, &tcv))
tcv = p->querylist->wait;
if(p->answerlist && dl_tv_smaller(&p->answerlist->wait, &tcv))
tcv = p->answerlist->wait;
}
if(peek) {
/* peek can be unaligned */
/* use wait as a temp variable */
memmove(wait, peek, sizeof(*wait));
if(!have_tcpval)
tcv = *wait;
else if(dl_tv_smaller(wait, &tcv))
tcv = *wait;
have_tcpval = 1;
}
if(have_tcpval) {
*wait = tcv;
dl_tv_subtract(wait, now);
return 1;
}
/* nothing, block */
return 0;
}
/** clear proxy list */
static void
proxy_list_clear(struct proxy* p)
{
char from[109];
struct proxy* np;
int i=0, port;
while(p) {
np = p->next;
port = (int)ntohs(((struct sockaddr_in*)&p->addr)->sin_port);
if(addr_is_ip6(&p->addr, p->addr_len)) {
if(inet_ntop(AF_INET6,
&((struct sockaddr_in6*)&p->addr)->sin6_addr,
from, (socklen_t)sizeof(from)) == 0)
(void)strlcpy(from, "err", sizeof(from));
} else {
if(inet_ntop(AF_INET,
&((struct sockaddr_in*)&p->addr)->sin_addr,
from, (socklen_t)sizeof(from)) == 0)
(void)strlcpy(from, "err", sizeof(from));
}
printf("client[%d]: last %s@%d of %d : %u in, %u out, "
"%u returned\n", i++, from, port, (int)p->numreuse+1,
(unsigned)p->numwait, (unsigned)p->numsent,
(unsigned)p->numreturn);
#ifndef USE_WINSOCK
close(p->s);
#else
closesocket(p->s);
#endif
free(p);
p = np;
}
}
/** clear TCP proxy list */
static void
tcp_proxy_list_clear(struct tcp_proxy* p)
{
struct tcp_proxy* np;
while(p) {
np = p->next;
tcp_proxy_delete(p);
p = np;
}
}
/** delayer service loop */
static void
service_loop(int udp_s, int listen_s, struct ringbuf* ring,
struct timeval* delay, struct timeval* reuse,
struct sockaddr_storage* srv_addr, socklen_t srv_len,
sldns_buffer* pkt)
{
fd_set rset, rorig;
fd_set wset, worig;
struct timeval now, wait;
int max, have_wait = 0;
struct proxy* proxies = NULL;
struct tcp_proxy* tcp_proxies = NULL;
struct timeval tcp_timeout;
tcp_timeout.tv_sec = 120;
tcp_timeout.tv_usec = 0;
#ifndef S_SPLINT_S
FD_ZERO(&rorig);
FD_ZERO(&worig);
FD_SET(FD_SET_T udp_s, &rorig);
FD_SET(FD_SET_T listen_s, &rorig);
#endif
max = udp_s + 1;
if(listen_s + 1 > max) max = listen_s + 1;
while(!do_quit) {
/* wait for events */
rset = rorig;
wset = worig;
if(have_wait)
verbose(1, "wait for %d.%6.6d",
(unsigned)wait.tv_sec, (unsigned)wait.tv_usec);
else verbose(1, "wait");
if(select(max, &rset, &wset, NULL, have_wait?&wait:NULL) < 0) {
if(errno == EAGAIN || errno == EINTR)
continue;
fatal_exit("select: %s", strerror(errno));
}
/* get current time */
if(gettimeofday(&now, NULL) < 0) {
if(errno == EAGAIN || errno == EINTR)
continue;
fatal_exit("gettimeofday: %s", strerror(errno));
}
verbose(1, "process at %u.%6.6u\n",
(unsigned)now.tv_sec, (unsigned)now.tv_usec);
/* sendout delayed queries to master server (frees up buffer)*/
service_send(ring, &now, pkt, srv_addr, srv_len);
/* proxy return replies */
service_proxy(&rset, udp_s, proxies, pkt, &now);
/* see what can be received to start waiting */
service_recv(udp_s, ring, pkt, &rorig, &max, &proxies,
srv_addr, srv_len, &now, delay, reuse);
/* see if there are new tcp connections */
service_tcp_listen(listen_s, &rorig, &max, &tcp_proxies,
srv_addr, srv_len, &now, &tcp_timeout);
/* service tcp connections */
service_tcp_relay(&tcp_proxies, &now, delay, &tcp_timeout,
pkt, &rset, &rorig, &worig);
/* see what next timeout is (if any) */
have_wait = service_findwait(&now, &wait, ring, tcp_proxies);
}
proxy_list_clear(proxies);
tcp_proxy_list_clear(tcp_proxies);
}
/** delayer main service routine */
static void
service(const char* bind_str, int bindport, const char* serv_str,
size_t memsize, int delay_msec)
{
struct sockaddr_storage bind_addr, srv_addr;
socklen_t bind_len, srv_len;
struct ringbuf* ring = ring_create(memsize);
struct timeval delay, reuse;
sldns_buffer* pkt;
int i, s, listen_s;
#ifndef S_SPLINT_S
delay.tv_sec = delay_msec / 1000;
delay.tv_usec = (delay_msec % 1000)*1000;
#endif
reuse = delay; /* reuse is max(4*delay, 1 second) */
dl_tv_add(&reuse, &delay);
dl_tv_add(&reuse, &delay);
dl_tv_add(&reuse, &delay);
if(reuse.tv_sec == 0)
reuse.tv_sec = 1;
if(!extstrtoaddr(serv_str, &srv_addr, &srv_len)) {
printf("cannot parse forward address: %s\n", serv_str);
exit(1);
}
pkt = sldns_buffer_new(65535);
if(!pkt)
fatal_exit("out of memory");
if( signal(SIGINT, delayer_sigh) == SIG_ERR ||
#ifdef SIGHUP
signal(SIGHUP, delayer_sigh) == SIG_ERR ||
#endif
#ifdef SIGQUIT
signal(SIGQUIT, delayer_sigh) == SIG_ERR ||
#endif
#ifdef SIGBREAK
signal(SIGBREAK, delayer_sigh) == SIG_ERR ||
#endif
#ifdef SIGALRM
signal(SIGALRM, delayer_sigh) == SIG_ERR ||
#endif
signal(SIGTERM, delayer_sigh) == SIG_ERR)
fatal_exit("could not bind to signal");
/* bind UDP port */
if((s = socket(str_is_ip6(bind_str)?AF_INET6:AF_INET,
SOCK_DGRAM, 0)) == -1) {
#ifndef USE_WINSOCK
fatal_exit("socket: %s", strerror(errno));
#else
fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
#endif
}
i=0;
if(bindport == 0) {
bindport = 1024 + arc4random()%64000;
i = 100;
}
while(1) {
if(!ipstrtoaddr(bind_str, bindport, &bind_addr, &bind_len)) {
printf("cannot parse listen address: %s\n", bind_str);
exit(1);
}
if(bind(s, (struct sockaddr*)&bind_addr, bind_len) == -1) {
#ifndef USE_WINSOCK
log_err("bind: %s", strerror(errno));
#else
log_err("bind: %s", wsa_strerror(WSAGetLastError()));
#endif
if(i--==0)
fatal_exit("cannot bind any port");
bindport = 1024 + arc4random()%64000;
} else break;
}
fd_set_nonblock(s);
/* and TCP port */
if((listen_s = socket(str_is_ip6(bind_str)?AF_INET6:AF_INET,
SOCK_STREAM, 0)) == -1) {
#ifndef USE_WINSOCK
fatal_exit("tcp socket: %s", strerror(errno));
#else
fatal_exit("tcp socket: %s", wsa_strerror(WSAGetLastError()));
#endif
}
#ifdef SO_REUSEADDR
if(1) {
int on = 1;
if(setsockopt(listen_s, SOL_SOCKET, SO_REUSEADDR, (void*)&on,
(socklen_t)sizeof(on)) < 0)
#ifndef USE_WINSOCK
fatal_exit("setsockopt(.. SO_REUSEADDR ..) failed: %s",
strerror(errno));
#else
fatal_exit("setsockopt(.. SO_REUSEADDR ..) failed: %s",
wsa_strerror(WSAGetLastError()));
#endif
}
#endif
if(bind(listen_s, (struct sockaddr*)&bind_addr, bind_len) == -1) {
#ifndef USE_WINSOCK
fatal_exit("tcp bind: %s", strerror(errno));
#else
fatal_exit("tcp bind: %s", wsa_strerror(WSAGetLastError()));
#endif
}
if(listen(listen_s, 5) == -1) {
#ifndef USE_WINSOCK
fatal_exit("tcp listen: %s", strerror(errno));
#else
fatal_exit("tcp listen: %s", wsa_strerror(WSAGetLastError()));
#endif
}
fd_set_nonblock(listen_s);
printf("listening on port: %d\n", bindport);
/* process loop */
do_quit = 0;
service_loop(s, listen_s, ring, &delay, &reuse, &srv_addr, srv_len,
pkt);
/* cleanup */
verbose(1, "cleanup");
#ifndef USE_WINSOCK
close(s);
close(listen_s);
#else
closesocket(s);
closesocket(listen_s);
#endif
sldns_buffer_free(pkt);
ring_delete(ring);
}
/** getopt global, in case header files fail to declare it. */
extern int optind;
/** getopt global, in case header files fail to declare it. */
extern char* optarg;
/** main program for delayer */
int main(int argc, char** argv)
{
int c; /* defaults */
const char* server = "127.0.0.1@53";
const char* bindto = "0.0.0.0";
int bindport = 0;
size_t memsize = 10*1024*1024;
int delay = 100;
verbosity = 0;
log_init(0, 0, 0);
log_ident_set("delayer");
if(argc == 1) usage(argv);
while( (c=getopt(argc, argv, "b:d:f:hm:p:")) != -1) {
switch(c) {
case 'b':
bindto = optarg;
break;
case 'd':
if(atoi(optarg)==0 && strcmp(optarg,"0")!=0) {
printf("bad delay: %s\n", optarg);
return 1;
}
delay = atoi(optarg);
break;
case 'f':
server = optarg;
break;
case 'm':
if(!cfg_parse_memsize(optarg, &memsize)) {
printf("bad memsize: %s\n", optarg);
return 1;
}
break;
case 'p':
if(atoi(optarg)==0 && strcmp(optarg,"0")!=0) {
printf("bad port nr: %s\n", optarg);
return 1;
}
bindport = atoi(optarg);
break;
case 'h':
case '?':
default:
usage(argv);
}
}
argc -= optind;
argv += optind;
if(argc != 0)
usage(argv);
printf("bind to %s @ %d and forward to %s after %d msec\n",
bindto, bindport, server, delay);
service(bindto, bindport, server, memsize, delay);
return 0;
}