int
dns_resolve (const char *q, const char qtype[2])
{
int r = 0;
char servers[64];
iopause_fd x[1];
struct taia stamp;
struct taia deadline;
if (dns_resolvconfip (servers) == -1)
return -1;
memset (&dns_resolve_tx, 0, sizeof (dns_resolve_tx));
r = dns_transmit_start (&dns_resolve_tx, servers, 1, q, qtype, "\0\0\0\0");
if (r == -1)
return -1;
for (;;)
{
taia_now (&stamp);
taia_uint (&deadline, 120);
taia_add (&deadline, &deadline, &stamp);
dns_transmit_io (&dns_resolve_tx, x, &deadline);
iopause (x, 1, &deadline, &stamp);
r = dns_transmit_get (&dns_resolve_tx, x, &stamp);
if (r == -1)
return -1;
if (r == 1)
return 0;
}
}
static void handle_accept( const int64 serversocket ) {
struct http_data *h;
unsigned char ip[4];
uint16 port;
tai6464 t;
int64 i;
while( ( i = socket_accept4( serversocket, (char*)ip, &port) ) != -1 ) {
/* Put fd into a non-blocking mode */
io_nonblock( i );
if( !io_fd( i ) ||
!( h = (struct http_data*)malloc( sizeof( struct http_data ) ) ) ) {
io_close( i );
continue;
}
io_setcookie( i, h );
io_wantread( i );
memset( h, 0, sizeof( struct http_data ) );
memmove( h->ip, ip, sizeof( ip ) );
stats_issue_event( EVENT_ACCEPT, 1, ntohl(*(uint32_t*)ip));
/* That breaks taia encapsulation. But there is no way to take system
time this often in FreeBSD and libowfat does not allow to set unix time */
taia_uint( &t, 0 ); /* Clear t */
tai_unix( &(t.sec), (g_now + OT_CLIENT_TIMEOUT) );
io_timeout( i, t );
}
if( errno == EAGAIN )
io_eagain( serversocket );
}
int timeoutconn(int s,char ip[4],uint16 port,unsigned int timeout)
{
struct taia now;
struct taia deadline;
iopause_fd x;
if (socket_connect4(s,ip,port) == -1) {
if ((errno != error_wouldblock) && (errno != error_inprogress)) return -1;
x.fd = s;
x.events = IOPAUSE_WRITE;
taia_now(&now);
taia_uint(&deadline,timeout);
taia_add(&deadline,&now,&deadline);
for (;;) {
taia_now(&now);
iopause(&x,1,&deadline,&now);
if (x.revents) break;
if (taia_less(&deadline,&now)) {
errno = error_timeout; /* note that connect attempt is continuing */
return -1;
}
}
if (!socket_connected(s)) return -1;
}
if (ndelay_off(s) == -1) return -1;
return 0;
}
int timeoutconn6(int s,const char ip[16],uint16 port,unsigned int scope_id,unsigned int timeout)
{
struct taia now;
struct taia deadline;
iopause_fd x;
if (socket_connect6(s,ip,port,scope_id) == -1) {
if ((errno != EWOULDBLOCK) && (errno != EINPROGRESS)) return -1;
x.fd = s;
x.events = IOPAUSE_WRITE;
taia_now(&now);
taia_uint(&deadline,timeout);
taia_add(&deadline,&now,&deadline);
for (;;) {
taia_now(&now);
iopause(&x,1,&deadline,&now);
if (x.revents) break;
if (taia_less(&deadline,&now)) {
errno = ETIMEDOUT; /* note that connect attempt is continuing */
return -1;
}
}
if (!socket_connected(s)) return -1;
}
if (ndelay_off(s) == -1) return -1;
return 0;
}
void t_timeout(int j)
{
struct taia now;
if (!t[j].active) return;
taia_now(&now);
taia_uint(&t[j].timeout,10);
taia_add(&t[j].timeout,&t[j].timeout,&now);
}
static int
thistcp (struct dns_transmit *d)
{
struct taia now;
const char *ip = NULL;
socketfree (d);
packetfree (d);
for (; d->curserver < 16; ++d->curserver)
{
ip = d->servers + 4 * d->curserver;
if (byte_diff (ip, 4, "\0\0\0\0"))
{
d->query[2] = dns_random (256);
d->query[3] = dns_random (256);
d->s1 = 1 + socket_tcp ();
if (!d->s1)
{
dns_transmit_free (d);
return -1;
}
if (randombind (d) == -1)
{
dns_transmit_free (d);
return -1;
}
taia_now (&now);
taia_uint (&d->deadline, 10);
taia_add (&d->deadline, &d->deadline, &now);
if (socket_connect4 (d->s1 - 1, ip, 53) == 0)
{
d->pos = 0;
d->tcpstate = 2;
return 0;
}
if (errno == error_inprogress || errno == error_wouldblock)
{
d->tcpstate = 1;
return 0;
}
socketfree(d);
}
}
dns_transmit_free(d);
return -1;
}
int resolve(char *q,char qtype[2],char ip[16])
{
struct taia start;
struct taia stamp;
struct taia deadline;
char servers[256];
iopause_fd x[1];
int r;
taia_now(&start);
byte_zero(servers,256);
byte_copy(servers,16,ip);
if (dns_transmit_start(&tx,servers,0,q,qtype,"\0\0\0\0") == -1) return -1;
for (;;) {
taia_now(&stamp);
taia_uint(&deadline,120);
taia_add(&deadline,&deadline,&stamp);
dns_transmit_io(&tx,x,&deadline);
iopause(x,1,&deadline,&stamp);
r = dns_transmit_get(&tx,x,&stamp);
if (r == -1) return -1;
if (r == 1) break;
}
taia_now(&stamp);
taia_sub(&stamp,&stamp,&start);
taia_uint(&deadline,1);
if (taia_less(&deadline,&stamp)) {
buffer_put(buffer_1,querystr.s,querystr.len);
buffer_puts(buffer_1,"ALERT:took more than 1 second\n");
}
return 0;
}
static ssize_t http_handle_fullscrape( const int64 sock, struct ot_workstruct *ws ) {
struct http_data* cookie = io_getcookie( sock );
int format = 0;
tai6464 t;
#ifdef WANT_MODEST_FULLSCRAPES
{
ot_scrape_log this_peer, *new_peer;
int exactmatch;
memcpy( this_peer.ip, cookie->ip, sizeof(ot_ip6));
this_peer.last_fullscrape = g_now_seconds;
pthread_mutex_lock(&g_modest_fullscrape_mutex);
new_peer = vector_find_or_insert( &g_modest_fullscrape_timeouts, &this_peer, sizeof(ot_scrape_log), sizeof(ot_ip6), &exactmatch );
if( !new_peer ) {
pthread_mutex_unlock(&g_modest_fullscrape_mutex);
HTTPERROR_500;
}
if( exactmatch && ( this_peer.last_fullscrape - new_peer->last_fullscrape ) < OT_MODEST_PEER_TIMEOUT ) {
pthread_mutex_unlock(&g_modest_fullscrape_mutex);
HTTPERROR_402_NOTMODEST;
}
memcpy( new_peer, &this_peer, sizeof(ot_scrape_log));
pthread_mutex_unlock(&g_modest_fullscrape_mutex);
}
#endif
#ifdef WANT_COMPRESSION_GZIP
ws->request[ws->request_size-1] = 0;
if( strstr( ws->request, "gzip" ) ) {
cookie->flag |= STRUCT_HTTP_FLAG_GZIP;
format = TASK_FLAG_GZIP;
stats_issue_event( EVENT_FULLSCRAPE_REQUEST_GZIP, 0, (uintptr_t)cookie->ip );
} else
#endif
stats_issue_event( EVENT_FULLSCRAPE_REQUEST, 0, (uintptr_t)cookie->ip );
#ifdef _DEBUG_HTTPERROR
fprintf( stderr, "%s", ws->debugbuf );
#endif
/* Pass this task to the worker thread */
cookie->flag |= STRUCT_HTTP_FLAG_WAITINGFORTASK;
/* Clients waiting for us should not easily timeout */
taia_uint( &t, 0 ); io_timeout( sock, t );
fullscrape_deliver( sock, TASK_FULLSCRAPE | format );
io_dontwantread( sock );
return ws->reply_size = -2;
}
int remoteinfo6(stralloc *out,char ipremote[16],uint16 portremote,char iplocal[16],uint16 portlocal,unsigned int timeout,uint32 netif)
{
int s;
int r;
if (!stralloc_copys(out,"")) return -1;
taia_now(&now);
taia_uint(&deadline,timeout);
taia_add(&deadline,&now,&deadline);
s = socket_tcp6();
if (s == -1) return -1;
r = doit(out,s,ipremote,portremote,iplocal,portlocal,timeout,netif);
close(s);
return r;
}
static void http_senddata( const int64 sock, struct ot_workstruct *ws ) {
struct http_data *cookie = io_getcookie( sock );
ssize_t written_size;
if( !cookie ) { io_close(sock); return; }
/* whoever sends data is not interested in its input-array */
if( ws->keep_alive && ws->header_size != ws->request_size ) {
size_t rest = ws->request_size - ws->header_size;
if( array_start(&cookie->request) ) {
memmove( array_start(&cookie->request), ws->request + ws->header_size, rest );
array_truncate( &cookie->request, 1, rest );
} else
array_catb(&cookie->request, ws->request + ws->header_size, rest );
} else
array_reset( &cookie->request );
written_size = write( sock, ws->reply, ws->reply_size );
if( ( written_size < 0 ) || ( ( written_size == ws->reply_size ) && !ws->keep_alive ) ) {
array_reset( &cookie->request );
free( cookie ); io_close( sock ); return;
}
if( written_size < ws->reply_size ) {
char * outbuf;
tai6464 t;
if( !( outbuf = malloc( ws->reply_size - written_size ) ) ) {
array_reset( &cookie->request );
free(cookie); io_close( sock );
return;
}
memcpy( outbuf, ws->reply + written_size, ws->reply_size - written_size );
iob_addbuf_free( &cookie->batch, outbuf, ws->reply_size - written_size );
/* writeable short data sockets just have a tcp timeout */
if( !ws->keep_alive ) {
taia_uint( &t, 0 ); io_timeout( sock, t );
io_dontwantread( sock );
}
io_wantwrite( sock );
}
}
int ssl_timeoutaccept(SSL *ssl,unsigned int timeout)
{
struct taia now;
struct taia deadline;
iopause_fd x;
int r;
int rfd;
int wfd;
taia_now(&now);
taia_uint(&deadline,timeout);
taia_add(&deadline,&now,&deadline);
rfd = SSL_get_fd(ssl); /* XXX */
wfd = SSL_get_fd(ssl); /* XXX */
SSL_set_accept_state(ssl);
for (;;) {
r = SSL_accept(ssl);
if (r == 1) return 0;
ssl_errno = SSL_get_error(ssl,r);
errno = error_proto;
if ((ssl_errno != SSL_ERROR_WANT_READ) && (ssl_errno != SSL_ERROR_WANT_WRITE))
return -1;
if (ssl_errno == SSL_ERROR_WANT_READ) {
x.events = IOPAUSE_READ;
x.fd = rfd;
if (x.fd == -1) return -1;
}
else {
x.events = IOPAUSE_WRITE;
x.fd = wfd;
if (x.fd == -1) return -1;
}
for (;;) {
taia_now(&now);
iopause(&x,1,&deadline,&now);
if (x.revents) break;
if (taia_less(&deadline,&now))
return -1;
}
}
}
int dns_resolvconfip(char s[64])
{
struct taia now;
taia_now(&now);
if (taia_less(&deadline,&now)) ok = 0;
if (!uses) ok = 0;
if (!ok) {
if (init(ip) == -1) return -1;
taia_uint(&deadline,600);
taia_add(&deadline,&now,&deadline);
uses = 10000;
ok = 1;
}
--uses;
byte_copy(s,64,ip);
return 0;
}
int dns_resolvconfrewrite(stralloc *out)
{
struct taia now;
taia_now(&now);
if (taia_less(&deadline,&now)) ok = 0;
if (!uses) ok = 0;
if (!ok) {
if (init(&rules) == -1) return -1;
taia_uint(&deadline,600);
taia_add(&deadline,&now,&deadline);
uses = 10000;
ok = 1;
}
--uses;
if (!stralloc_copy(out,&rules)) return -1;
return 0;
}
int dns_resolve(const char *q,const char qtype[2])
{
struct taia stamp;
struct taia deadline;
char servers[256];
iopause_fd x[1];
int r;
if (dns_resolvconfip(servers) == -1) return -1;
if (dns_transmit_start(&dns_resolve_tx,servers,1,q,qtype,V6any) == -1) return -1;
for (;;) {
taia_now(&stamp);
taia_uint(&deadline,120);
taia_add(&deadline,&deadline,&stamp);
dns_transmit_io(&dns_resolve_tx,x,&deadline);
iopause(x,1,&deadline,&stamp);
r = dns_transmit_get(&dns_resolve_tx,x,&stamp);
if (r == -1) return -1;
if (r == 1) return 0;
}
}
int resolve(char *q,char qtype[2],char servers[256])
{
struct taia stamp;
struct taia deadline;
iopause_fd x[1];
int r;
if (dns_transmit_start(&tx,servers,0,q,qtype,V6any) == -1) return -1;
for (;;) {
taia_now(&stamp);
taia_uint(&deadline,120);
taia_add(&deadline,&deadline,&stamp);
dns_transmit_io(&tx,x,&deadline);
iopause(x,1,&deadline,&stamp);
r = dns_transmit_get(&tx,x,&stamp);
if (r == -1) return -1;
if (r == 1) break;
}
return 0;
}
int timeoutwrite(int t,int fd,const char *buf,int len)
{
struct taia now;
struct taia deadline;
iopause_fd x;
taia_now(&now);
taia_uint(&deadline,t);
taia_add(&deadline,&now,&deadline);
x.fd = fd;
x.events = IOPAUSE_WRITE;
for (;;) {
taia_now(&now);
iopause(&x,1,&deadline,&now);
if (x.revents) break;
if (taia_less(&deadline,&now)) {
errno = error_timeout;
return -1;
}
}
return write(fd,buf,len);
}
int timeoutread(int t,int fd,char *buf,int len)
{
struct taia now;
struct taia deadline;
iopause_fd x;
taia_now(&now);
taia_uint(&deadline,t);
taia_add(&deadline,&now,&deadline);
x.fd = fd;
x.events = IOPAUSE_READ;
for (;;) {
taia_now(&now);
iopause(&x,1,&deadline,&now);
if (x.revents) break;
if (taia_less(&deadline,&now)) {
errno = ETIMEDOUT;
return -1;
}
}
return read(fd,buf,len);
}
static int thisudp(struct dns_transmit *d)
{
const char *ip;
socketfree(d);
while (d->udploop < 4) {
for (;d->curserver < 16;++d->curserver) {
ip = d->servers + 4 * d->curserver;
if (byte_diff(ip,4,"\0\0\0\0")) {
d->query[2] = dns_random(256);
d->query[3] = dns_random(256);
d->s1 = 1 + socket_udp();
if (!d->s1) { dns_transmit_free(d); return -1; }
if (randombind(d) == -1) { dns_transmit_free(d); return -1; }
if (socket_connect4(d->s1 - 1,ip,53) == 0)
if (send(d->s1 - 1,d->query + 2,d->querylen - 2,0) == d->querylen - 2) {
struct taia now;
taia_now(&now);
taia_uint(&d->deadline,timeouts[d->udploop]);
taia_add(&d->deadline,&d->deadline,&now);
d->tcpstate = 0;
return 0;
}
socketfree(d);
}
}
++d->udploop;
d->curserver = 0;
}
dns_transmit_free(d); return -1;
}
int timeoutaccept6(int s,char ip[16],uint16 *port,unsigned int timeout,uint32 *scope_id)
{
struct taia now;
struct taia deadline;
iopause_fd x;
x.fd = s;
x.events = IOPAUSE_READ;
taia_now(&now);
taia_uint(&deadline,timeout);
taia_add(&deadline,&now,&deadline);
for (;;) {
taia_now(&now);
iopause(&x,1,&deadline,&now);
if (x.revents) break;
if (taia_less(&deadline,&now)) {
errno = ETIMEDOUT; /* note that connect attempt is continuing */
return -1;
}
}
if (!socket_connected(s)) return -1;
if (ndelay_off(s) == -1) return -1;
return socket_accept6(s,ip,port,scope_id);
}
static int thistcp(struct dns_transmit *d)
{
struct taia now;
const char *ip;
socketfree(d);
packetfree(d);
for (;d->curserver < 16;++d->curserver) {
ip = d->servers + 16 * d->curserver;
if (byte_diff(ip,16,V6any)) {
d->query[2] = dns_random(256);
d->query[3] = dns_random(256);
d->s1 = 1 + socket_tcp6();
if (!d->s1) { dns_transmit_free(d); return -1; }
if (randombind(d) == -1) { dns_transmit_free(d); return -1; }
taia_now(&now);
taia_uint(&d->deadline,10);
taia_add(&d->deadline,&d->deadline,&now);
if (socket_connect6(d->s1 - 1,ip,53,d->scope_id) == 0) {
d->tcpstate = 2;
return 0;
}
if ((errno == error_inprogress) || (errno == error_wouldblock)) {
d->tcpstate = 1;
return 0;
}
socketfree(d);
}
}
dns_transmit_free(d); return -1;
}
void doio(void) {
iopause_fd x[2];
struct taia deadline;
struct taia now;
struct taia timeout;
if (! stralloc_ready(&encinbuf, bufsizein)) die_nomem();
encin.buf =encin.start =encin.end =encinbuf.s; encin.size =bufsizein;
if (! stralloc_ready(&decinbuf, bufsizein)) die_nomem();
decin.buf =decin.start =decin.end =decinbuf.s; decin.size =bufsizein;
if (! stralloc_ready(&encoubuf, bufsizeou)) die_nomem();
encou.buf =encou.start =encou.end =encoubuf.s; encou.size =bufsizeou;
if (! stralloc_ready(&decoubuf, bufsizeou)) die_nomem();
decou.buf =decou.start =decou.end =decoubuf.s; decou.size =bufsizeou;
if (client) {
rc =matrixSslEncodeClientHello(ssl, &decou, 0);
if (rc != 0) fatalx("unable to encode client hello");
if (write(fdstdou, decou.start, decou.end -decou.start)
!= (decou.end -decou.start))
fatal("unable to send client hello");
if (verbose > 2) info("sending client hello");
if (verbose > 2) infou("write bytes: ", decou.end -decou.start);
bytesou +=decou.end -decou.start;
decou.start =decou.end =decou.buf;
}
taia_now(&now);
taia_uint(&timeout, handshake_timeout);
taia_add(&timeout, &now, &timeout);
for (;;) {
iopause_fd *xx =x;
int l =2;
x[0].fd =encpipe[0];
x[0].events =IOPAUSE_READ;
x[0].revents =0;
x[1].fd =fdstdin;
x[1].events =IOPAUSE_READ;
x[1].revents =0;
if ((x[0].fd == -1) || handshake) { --l; ++xx; }
if (x[1].fd == -1) --l;
if (! l) return;
taia_now(&now);
if (handshake) {
if (taia_less(&timeout, &now)) {
if (verbose) info("ssl handshake timeout, exit.");
return;
}
deadline.sec =timeout.sec;
deadline.nano =timeout.nano;
deadline.atto =timeout.atto;
}
else {
taia_uint(&deadline, 30);
taia_add(&deadline, &now, &deadline);
}
iopause(xx, l, &deadline, &now);
if (x[0].revents) encode();
if (x[1].revents) decode();
}
}
int main(int argc, char **argv)
{
struct stat s;
time_t mtime =0;
int wstat;
int curdir;
int pid;
struct taia deadline;
struct taia now;
struct taia stampcheck;
char ch;
int i;
progname =*argv++;
if (! argv || ! *argv) usage();
if (**argv == '-')
{
switch (*(*argv +1))
{
case 'P':
pgrp =1;
case '-':
++argv;
}
if (! argv || ! *argv) usage();
}
sig_catch(sig_term, s_term);
sig_catch(sig_hangup, s_hangup);
svdir =*argv++;
if (argv && *argv)
{
rplog =*argv;
if (setup_log() != 1)
{
rplog =0;
warn3x("log service disabled.", 0, 0);
}
}
if ((curdir =open_read(".")) == -1)
fatal("unable to open current directory", 0);
coe(curdir);
taia_now(&stampcheck);
for (;;)
{
/* collect children */
for (;;)
{
if ((pid =wait_nohang(&wstat)) <= 0) break;
for (i =0; i < svnum; i++)
{
if (pid == sv[i].pid)
{
/* runsv has gone */
sv[i].pid =0;
check =1;
break;
}
}
}
taia_now(&now);
if (now.sec.x < (stampcheck.sec.x -3))
{
/* time warp */
warn3x("time warp: resetting time stamp.", 0, 0);
taia_now(&stampcheck);
taia_now(&now);
if (rplog) taia_now(&stamplog);
}
if (taia_less(&now, &stampcheck) == 0)
{
/* wait at least a second */
taia_uint(&deadline, 1);
taia_add(&stampcheck, &now, &deadline);
if (stat(svdir, &s) != -1)
{
if (check || \
s.st_mtime != mtime || s.st_ino != ino || s.st_dev != dev)
{
/* svdir modified */
if (chdir(svdir) != -1)
{
mtime =s.st_mtime;
dev =s.st_dev;
ino =s.st_ino;
check =0;
if (now.sec.x <= (4611686018427387914ULL +(uint64)mtime))
sleep(1);
runsvdir();
while (fchdir(curdir) == -1)
{
warn("unable to change directory, pausing", 0);
sleep(5);
}
}
else
warn("unable to change directory to ", svdir);
}
}
else
warn("unable to stat ", svdir);
}
if (rplog)
if (taia_less(&now, &stamplog) == 0)
{
write(logpipe[1], ".", 1);
taia_uint(&deadline, 900);
taia_add(&stamplog, &now, &deadline);
}
/* half a second */
deadline.sec.x =0;
deadline.nano =500000000UL;
deadline.atto =0;
taia_add(&deadline, &now, &deadline);
sig_block(sig_child);
if (rplog)
iopause(io, 1, &deadline, &now);
else
iopause(0, 0, &deadline, &now);
sig_unblock(sig_child);
if (rplog && (io[0].revents | IOPAUSE_READ))
while (read(logpipe[0], &ch, 1) > 0)
if (ch)
{
for (i =6; i < rploglen; i++)
rplog[i -1] =rplog[i];
rplog[rploglen -1] =ch;
}
switch(exitsoon)
{
case 1:
_exit(0);
case 2:
for (i =0; i < svnum; i++) if (sv[i].pid) kill(sv[i].pid, SIGTERM);
_exit(111);
}
} /* for (;;) */
/* not reached */
_exit(0);
}
int main(int argc,char **argv)
{
struct taia stamp;
struct taia deadline;
int opt;
unsigned long u;
int i;
int j;
int r;
while ((opt = getopt(argc,argv,"c:l:")) != opteof)
switch(opt) {
case 'c':
scan_ulong(optarg,&u);
if (u < 1) u = 1;
if (u > 1000) u = 1000;
maxactive = u;
break;
case 'l':
scan_ulong(optarg,&u);
if (u < 1) u = 1;
if (u > 1000000) u = 1000000;
xmax = u;
break;
default:
strerr_die1x(111,"dnsfilter: usage: dnsfilter [ -c concurrency ] [ -l lines ]");
}
x = (struct line *) alloc(xmax * sizeof(struct line));
if (!x) nomem();
byte_zero(x,xmax * sizeof(struct line));
io = (iopause_fd *) alloc((xmax + 1) * sizeof(iopause_fd));
if (!io) nomem();
if (!stralloc_copys(&partial,"")) nomem();
while (flag0 || inbuflen || partial.len || xnum) {
taia_now(&stamp);
taia_uint(&deadline,120);
taia_add(&deadline,&deadline,&stamp);
iolen = 0;
if (flag0)
if (inbuflen < sizeof inbuf) {
inio = io + iolen++;
inio->fd = 0;
inio->events = IOPAUSE_READ;
}
for (i = 0;i < xnum;++i)
if (x[i].flagactive) {
x[i].io = io + iolen++;
dns_transmit_io(&x[i].dt,x[i].io,&deadline);
}
iopause(io,iolen,&deadline,&stamp);
if (flag0)
if (inbuflen < sizeof inbuf)
if (inio->revents) {
r = read(0,inbuf + inbuflen,(sizeof inbuf) - inbuflen);
if (r <= 0)
flag0 = 0;
else
inbuflen += r;
}
for (i = 0;i < xnum;++i)
if (x[i].flagactive) {
r = dns_transmit_get(&x[i].dt,x[i].io,&stamp);
if (r == -1) {
errout(i);
x[i].flagactive = 0;
--numactive;
}
else if (r == 1) {
if (dns_name_packet(&x[i].middle,x[i].dt.packet,x[i].dt.packetlen) == -1)
errout(i);
if (x[i].middle.len)
if (!stralloc_cats(&x[i].left,"=")) nomem();
x[i].flagactive = 0;
--numactive;
}
}
for (;;) {
if (xnum && !x[0].flagactive) {
buffer_put(buffer_1,x[0].left.s,x[0].left.len);
buffer_put(buffer_1,x[0].middle.s,x[0].middle.len);
buffer_put(buffer_1,x[0].right.s,x[0].right.len);
buffer_flush(buffer_1);
--xnum;
tmp = x[0];
for (i = 0;i < xnum;++i) x[i] = x[i + 1];
x[xnum] = tmp;
continue;
}
if ((xnum < xmax) && (numactive < maxactive)) {
i = byte_chr(inbuf,inbuflen,'\n');
if (inbuflen && (i == inbuflen)) {
if (!stralloc_catb(&partial,inbuf,inbuflen)) nomem();
inbuflen = 0;
continue;
}
if ((i < inbuflen) || (!flag0 && partial.len)) {
if (i < inbuflen) ++i;
if (!stralloc_catb(&partial,inbuf,i)) nomem();
inbuflen -= i;
for (j = 0;j < inbuflen;++j) inbuf[j] = inbuf[j + i];
if (partial.len) {
i = byte_chr(partial.s,partial.len,'\n');
i = byte_chr(partial.s,i,'\t');
i = byte_chr(partial.s,i,' ');
if (!stralloc_copyb(&x[xnum].left,partial.s,i)) nomem();
if (!stralloc_copys(&x[xnum].middle,"")) nomem();
if (!stralloc_copyb(&x[xnum].right,partial.s + i,partial.len - i)) nomem();
x[xnum].flagactive = 0;
partial.len = i;
if (!stralloc_0(&partial)) nomem();
if (ip4_scan(partial.s,ip)) {
dns_name4_domain(name,ip);
if (dns_resolvconfip(servers) == -1)
strerr_die2sys(111,FATAL,"unable to read /etc/resolv.conf: ");
if (dns_transmit_start(&x[xnum].dt,servers,1,name,DNS_T_PTR,"\0\0\0\0") == -1)
errout(xnum);
else {
x[xnum].flagactive = 1;
++numactive;
}
}
++xnum;
}
partial.len = 0;
continue;
}
}
break;
}
}
_exit(0);
}
int
main (int argc, char *argv[])
{
time_t t = 0;
char *x = NULL;
struct sigaction sa;
iopause_fd *iop = NULL;
int i = 0, n = 0, *udp53 = NULL;
prog = strdup ((x = strrchr (argv[0], '/')) != NULL ? x + 1 : argv[0]);
sa.sa_handler = handle_term;
sigaction (SIGINT, &sa, NULL);
sigaction (SIGTERM, &sa, NULL);
sa.sa_handler = SIG_IGN;
sigaction (SIGPIPE, &sa, NULL);
i = check_option (argc, argv);
argc -= i;
argv += i;
if (mode & DAEMON)
{
i = fork ();
if (i == -1)
err (-1, "could not fork a daemon process");
if (i > 0)
return 0;
}
time (&t);
memset (buf, 0, sizeof (buf));
strftime (buf, sizeof (buf), "%b-%d %Y %T %Z", localtime (&t));
warnx ("version %s: starting: %s\n", VERSION, buf);
set_timezone ();
if (debug_level)
warnx ("TIMEZONE: %s", env_get ("TZ"));
initialize ();
if (!debug_level)
if ((x = env_get ("DEBUG_LEVEL")))
debug_level = atol (x);
warnx ("DEBUG_LEVEL set to `%d'", debug_level);
if ((x = env_get ("DATALIMIT")))
{
struct rlimit r;
unsigned long dlimit = atol (x);
if (getrlimit (RLIMIT_DATA, &r) != 0)
err (-1, "could not get resource RLIMIT_DATA");
r.rlim_cur = (dlimit <= r.rlim_max) ? dlimit : r.rlim_max;
if (setrlimit (RLIMIT_DATA, &r) != 0)
err (-1, "could not set resource RLIMIT_DATA");
if (debug_level)
warnx ("DATALIMIT set to `%ld' bytes", r.rlim_cur);
}
if (!(x = env_get ("IP")))
err (-1, "$IP not set");
for (i = 0; (unsigned)i < strlen (x); i++)
n = (x[i] == ',') ? n+1 : n;
if (!(udp53 = calloc (n+1, sizeof (int))))
err (-1, "could not allocate enough memory for udp53");
if (!(iop = calloc (n+1, sizeof (iopause_fd))))
err (-1, "could not allocate enough memory for iop");
i = n = 0;
while (x[i])
{
unsigned int l = 0;
if (!(l = ip4_scan(x+i, ip)))
errx (-1, "could not parse IP address `%s'", x + i);
udp53[n] = socket_udp();
if (udp53[n] == -1)
errx (-1, "could not open UDP socket");
if (socket_bind4_reuse (udp53[n], ip, server_port) == -1)
errx (-1, "could not bind UDP socket");
ndelay_off (udp53[n]);
socket_tryreservein (udp53[n], 65536);
iop[n].fd = udp53[n];
iop[n].events = IOPAUSE_READ;
n++;
i += (x[i + l] == ',') ? l + 1 : l;
}
droproot ();
while (1)
{
struct taia stamp;
struct in_addr odst; /* original destination IP */
struct taia deadline;
taia_now (&stamp);
taia_uint (&deadline, 300);
taia_add (&deadline, &deadline, &stamp);
iopause (iop, n, &deadline, &stamp);
for (i = 0; i < n; i++)
{
if (!iop[i].revents)
continue;
len = socket_recv4 (udp53[i], buf, sizeof (buf), ip, &port, &odst);
if (len < 0)
continue;
if (!doit ())
continue;
if (response_len > 512)
response_tc ();
/* may block for buffer space; if it fails, too bad */
len = socket_send4 (udp53[i], response,
response_len, ip, port, &odst);
if (len < 0)
continue;
if (debug_level > 1)
log_querydone(qnum, response, response_len);
}
}
return 0;
}
static void
doit (void)
{
struct taia stamp;
struct taia deadline;
int j = 0, r = 0, iolen = 0;
for (;;)
{
taia_now (&stamp);
taia_uint (&deadline, 120);
taia_add (&deadline, &deadline, &stamp);
iolen = 0;
udp53io = io + iolen++;
udp53io->fd = udp53;
udp53io->events = IOPAUSE_READ;
tcp53io = io + iolen++;
tcp53io->fd = tcp53;
tcp53io->events = IOPAUSE_READ;
for (j = 0; j < MAXUDP; ++j)
{
if (u[j].active)
{
u[j].io = io + iolen++;
query_io (&u[j].q, u[j].io, &deadline);
}
}
for (j = 0; j < MAXTCP; ++j)
{
if (t[j].active)
{
t[j].io = io + iolen++;
if (t[j].state == 0)
query_io (&t[j].q, t[j].io, &deadline);
else
{
if (taia_less (&t[j].timeout, &deadline))
deadline = t[j].timeout;
t[j].io->fd = t[j].tcp;
t[j].io->events = (t[j].state > 0) ?
IOPAUSE_READ : IOPAUSE_WRITE;
}
}
}
iopause (io, iolen, &deadline, &stamp);
for (j = 0; j < MAXUDP; ++j)
{
if (u[j].active)
{
r = query_get (&u[j].q, u[j].io, &stamp);
if (r == -1)
u_drop (j);
if (r == 1)
u_respond (j);
}
}
for (j = 0; j < MAXTCP; ++j)
{
if (t[j].active)
{
if (t[j].io->revents)
t_timeout (j);
if (t[j].state == 0)
{
r = query_get (&t[j].q, t[j].io, &stamp);
if (r == -1)
t_drop (j);
if (r == 1)
t_respond (j);
}
else
if (t[j].io->revents || taia_less (&t[j].timeout, &stamp))
t_rw (j);
}
}
if (udp53io && udp53io->revents)
u_new();
if (tcp53io && tcp53io->revents)
t_new();
}
}
void doit(int fdleft,int fdright) /* copy 0 -> fdleft, copy fdright -> 1 */
{
struct taia stamp;
struct taia deadline;
iopause_fd x[4];
int xlen;
iopause_fd *io0;
iopause_fd *ioleft;
iopause_fd *io1;
iopause_fd *ioright;
int r;
for (;;) {
xlen = 0;
io0 = 0;
if (leftstatus == 0) {
io0 = &x[xlen++];
io0->fd = 0;
io0->events = IOPAUSE_READ;
}
ioleft = 0;
if (leftstatus == 1) {
ioleft = &x[xlen++];
ioleft->fd = fdleft;
ioleft->events = IOPAUSE_WRITE;
}
ioright = 0;
if (rightstatus == 0) {
ioright = &x[xlen++];
ioright->fd = fdright;
ioright->events = IOPAUSE_READ;
}
io1 = 0;
if (rightstatus == 1) {
io1 = &x[xlen++];
io1->fd = 1;
io1->events = IOPAUSE_WRITE;
}
taia_now(&stamp);
taia_uint(&deadline,3600);
taia_add(&deadline,&stamp,&deadline);
iopause(x,xlen,&deadline,&stamp);
if (io0 && io0->revents) {
r = read(0,leftbuf,sizeof leftbuf);
if (r <= 0) {
leftstatus = -1;
close(fdleft);
buffer_puts(&ssrecord,pid);
buffer_puts(&ssrecord," < [EOF]\n");
buffer_flush(&ssrecord);
}
else {
leftstatus = 1; leftpos = 0; leftlen = r;
record(leftbuf,r," < ");
}
}
if (ioleft && ioleft->revents) {
r = write(fdleft,leftbuf + leftpos,leftlen - leftpos);
if (r == -1) break;
leftpos += r;
if (leftpos == leftlen) leftstatus = 0;
}
if (ioright && ioright->revents) {
r = read(fdright,rightbuf,sizeof rightbuf);
if (r <= 0) {
buffer_puts(&ssrecord,pid);
buffer_puts(&ssrecord," > [EOF]\n");
buffer_flush(&ssrecord);
break;
}
rightstatus = 1; rightpos = 0; rightlen = r;
record(rightbuf,r," > ");
}
if (io1 && io1->revents) {
r = write(1,rightbuf + rightpos,rightlen - rightpos);
if (r == -1) break;
rightpos += r;
if (rightpos == rightlen) rightstatus = 0;
}
}
_exit(0);
}
void doit(void)
{
iopause_fd x[2];
struct taia deadline;
struct taia stamp;
int wstat;
int r;
char ch;
announce();
for (;;) {
if (flagexit && !pid) return;
sig_unblock(sig_child);
x[0].fd = selfpipe[0];
x[0].events = IOPAUSE_READ;
x[1].fd = fdcontrol;
x[1].events = IOPAUSE_READ;
taia_now(&stamp);
taia_uint(&deadline,3600);
taia_add(&deadline,&stamp,&deadline);
iopause(x,2,&deadline,&stamp);
sig_block(sig_child);
while (read(selfpipe[0],&ch,1) == 1)
;
for (;;) {
r = wait_nohang(&wstat);
if (!r) break;
if ((r == -1) && (errno != error_intr)) break;
if (r == pid) {
pid = 0;
pidchange();
announce();
if (flagexit) return;
if (flagwant && flagwantup) trystart();
break;
}
}
if (read(fdcontrol,&ch,1) == 1)
switch(ch) {
case 'd':
flagwant = 1;
flagwantup = 0;
if (pid) { kill(pid,SIGTERM); kill(pid,SIGCONT); flagpaused = 0; }
announce();
break;
case 'u':
flagwant = 1;
flagwantup = 1;
announce();
if (!pid) trystart();
break;
case 'o':
flagwant = 0;
announce();
if (!pid) trystart();
break;
case 'a':
if (pid) kill(pid,SIGALRM);
break;
case 'h':
if (pid) kill(pid,SIGHUP);
break;
case 'k':
if (pid) kill(pid,SIGKILL);
break;
case 't':
if (pid) kill(pid,SIGTERM);
break;
case 'i':
if (pid) kill(pid,SIGINT);
break;
case 'p':
flagpaused = 1;
announce();
if (pid) kill(pid,SIGSTOP);
break;
case 'c':
flagpaused = 0;
announce();
if (pid) kill(pid,SIGCONT);
break;
case 'x':
flagexit = 1;
announce();
break;
}
}
}
int dns_transmit_get(struct dns_transmit *d,const iopause_fd *x,const struct taia *when)
{
char udpbuf[513];
unsigned char ch;
int r;
int fd;
errno = error_io;
fd = d->s1 - 1;
if (!x->revents) {
if (taia_less(when,&d->deadline)) return 0;
errno = error_timeout;
if (d->tcpstate == 0) return nextudp(d);
return nexttcp(d);
}
if (d->tcpstate == 0) {
/*
have attempted to send UDP query to each server udploop times
have sent query to curserver on UDP socket s
*/
r = recv(fd,udpbuf,sizeof udpbuf,0);
if (r <= 0) {
if (errno == error_connrefused) if (d->udploop == 2) return 0;
return nextudp(d);
}
if (r + 1 > sizeof udpbuf) return 0;
if (irrelevant(d,udpbuf,r)) return 0;
if (serverwantstcp(udpbuf,r)) return firsttcp(d);
if (serverfailed(udpbuf,r)) {
if (d->udploop == 2) return 0;
return nextudp(d);
}
socketfree(d);
d->packetlen = r;
d->packet = alloc(d->packetlen);
if (!d->packet) { dns_transmit_free(d); return -1; }
byte_copy(d->packet,d->packetlen,udpbuf);
queryfree(d);
return 1;
}
if (d->tcpstate == 1) {
/*
have sent connection attempt to curserver on TCP socket s
pos not defined
*/
if (!socket_connected(fd)) return nexttcp(d);
d->pos = 0;
d->tcpstate = 2;
return 0;
}
if (d->tcpstate == 2) {
/*
have connection to curserver on TCP socket s
have sent pos bytes of query
*/
r = write(fd,d->query + d->pos,d->querylen - d->pos);
if (r <= 0) return nexttcp(d);
d->pos += r;
if (d->pos == d->querylen) {
struct taia now;
taia_now(&now);
taia_uint(&d->deadline,10);
taia_add(&d->deadline,&d->deadline,&now);
d->tcpstate = 3;
}
return 0;
}
if (d->tcpstate == 3) {
/*
have sent entire query to curserver on TCP socket s
pos not defined
*/
r = read(fd,&ch,1);
if (r <= 0) return nexttcp(d);
d->packetlen = ch;
d->tcpstate = 4;
return 0;
}
if (d->tcpstate == 4) {
/*
have sent entire query to curserver on TCP socket s
pos not defined
have received one byte of packet length into packetlen
*/
r = read(fd,&ch,1);
if (r <= 0) return nexttcp(d);
d->packetlen <<= 8;
d->packetlen += ch;
d->tcpstate = 5;
d->pos = 0;
d->packet = alloc(d->packetlen);
if (!d->packet) { dns_transmit_free(d); return -1; }
return 0;
}
if (d->tcpstate == 5) {
/*
have sent entire query to curserver on TCP socket s
have received entire packet length into packetlen
packet is allocated
have received pos bytes of packet
*/
r = read(fd,d->packet + d->pos,d->packetlen - d->pos);
if (r <= 0) return nexttcp(d);
d->pos += r;
if (d->pos < d->packetlen) return 0;
socketfree(d);
if (irrelevant(d,d->packet,d->packetlen)) return nexttcp(d);
if (serverwantstcp(d->packet,d->packetlen)) return nexttcp(d);
if (serverfailed(d->packet,d->packetlen)) return nexttcp(d);
queryfree(d);
return 1;
}
return 0;
}
void doit(int fdleft,int fdright)
{
struct taia stamp;
struct taia deadline;
iopause_fd x[4];
int xlen;
iopause_fd *io0;
iopause_fd *ioleft;
iopause_fd *io1;
iopause_fd *ioright;
int r;
int i;
char ch;
for (;;) {
xlen = 0;
io0 = 0;
if (leftstatus == 0) {
io0 = &x[xlen++];
io0->fd = 0;
io0->events = IOPAUSE_READ;
}
ioleft = 0;
if (leftstatus == 1) {
ioleft = &x[xlen++];
ioleft->fd = fdleft;
ioleft->events = IOPAUSE_WRITE;
}
ioright = 0;
if (rightstatus == 0) {
ioright = &x[xlen++];
ioright->fd = fdright;
ioright->events = IOPAUSE_READ;
}
io1 = 0;
if (rightstatus == 1) {
io1 = &x[xlen++];
io1->fd = 1;
io1->events = IOPAUSE_WRITE;
}
taia_now(&stamp);
taia_uint(&deadline,3600);
taia_add(&deadline,&stamp,&deadline);
iopause(x,xlen,&deadline,&stamp);
if (io0 && io0->revents) {
r = read(0,prebuf,sizeof prebuf);
if (r <= 0) {
leftstatus = -1;
close(fdleft);
}
else {
leftstatus = 1;
leftpos = 0;
leftlen = 0;
for (i = 0;i < r;++i) {
ch = prebuf[i];
if (ch == '\n')
if (!leftflagcr)
leftbuf[leftlen++] = '\r';
leftbuf[leftlen++] = ch;
leftflagcr = (ch == '\r');
}
}
}
if (ioleft && ioleft->revents) {
r = write(fdleft,leftbuf + leftpos,leftlen - leftpos);
if (r == -1) break;
leftpos += r;
if (leftpos == leftlen) leftstatus = 0;
}
if (ioright && ioright->revents) {
r = read(fdright,prebuf,sizeof prebuf);
if (r <= 0) break;
rightstatus = 1;
rightpos = 0;
rightlen = 0;
for (i = 0;i < r;++i) {
ch = prebuf[i];
if (ch == '\n')
if (!rightflagcr)
rightbuf[rightlen++] = '\r';
rightbuf[rightlen++] = ch;
rightflagcr = (ch == '\r');
}
}
if (io1 && io1->revents) {
r = write(1,rightbuf + rightpos,rightlen - rightpos);
if (r == -1) break;
rightpos += r;
if (rightpos == rightlen) rightstatus = 0;
}
}
_exit(0);
}
static int
thisudp (struct dns_transmit *d)
{
const char *ip = NULL;
socketfree (d);
mergefree (d);
while (d->udploop < 4)
{
for (; d->curserver < 16; ++d->curserver)
{
ip = d->servers + 4 * d->curserver;
if (byte_diff (ip, 4, "\0\0\0\0"))
{
if (merge_enable && try_merge (d))
{
if (merge_logger)
merge_logger (ip, d->qtype, d->query + 14);
return 0;
}
d->query[2] = dns_random (256);
d->query[3] = dns_random (256);
d->s1 = 1 + socket_udp ();
if (!d->s1)
{
dns_transmit_free (d);
return -1;
}
if (randombind (d) == -1)
{
dns_transmit_free (d);
return -1;
}
if (socket_connect4 (d->s1 - 1, ip, 53) == 0)
{
if (send (d->s1 - 1, d->query + 2, d->querylen - 2, 0)
== d->querylen - 2)
{
struct taia now;
taia_now (&now);
taia_uint (&d->deadline, timeouts[d->udploop]);
taia_add (&d->deadline, &d->deadline, &now);
d->tcpstate = 0;
if (merge_enable)
register_inprogress (d);
return 0;
}
}
socketfree (d);
}
}
++d->udploop;
d->curserver = 0;
}
dns_transmit_free (d);
return -1;
}
