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rumpclient.c revision 1.22 
      1 /*      $NetBSD: rumpclient.c,v 1.22 2011/02/05 12:38:19 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2010, 2011 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * Client side routines for rump syscall proxy.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD");
     34 
     35 #include <sys/param.h>
     36 #include <sys/event.h>
     37 #include <sys/mman.h>
     38 #include <sys/socket.h>
     39 
     40 #include <arpa/inet.h>
     41 #include <netinet/in.h>
     42 #include <netinet/tcp.h>
     43 
     44 #include <assert.h>
     45 #include <dlfcn.h>
     46 #include <errno.h>
     47 #include <fcntl.h>
     48 #include <link.h>
     49 #include <poll.h>
     50 #include <pthread.h>
     51 #include <signal.h>
     52 #include <stdarg.h>
     53 #include <stdbool.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 #include <rump/rumpclient.h>
     60 
     61 #define HOSTOPS
     62 int	(*host_socket)(int, int, int);
     63 int	(*host_close)(int);
     64 int	(*host_connect)(int, const struct sockaddr *, socklen_t);
     65 int	(*host_fcntl)(int, int, ...);
     66 int	(*host_poll)(struct pollfd *, nfds_t, int);
     67 ssize_t	(*host_read)(int, void *, size_t);
     68 ssize_t (*host_sendto)(int, const void *, size_t, int,
     69 		       const struct sockaddr *, socklen_t);
     70 int	(*host_setsockopt)(int, int, int, const void *, socklen_t);
     71 
     72 int	(*host_kqueue)(void);
     73 int	(*host_kevent)(int, const struct kevent *, size_t,
     74 		       struct kevent *, size_t, const struct timespec *);
     75 
     76 #include "sp_common.c"
     77 
     78 static struct spclient clispc = {
     79 	.spc_fd = -1,
     80 };
     81 
     82 static int kq = -1;
     83 static sigset_t fullset;
     84 
     85 static int doconnect(bool);
     86 static int handshake_req(struct spclient *, uint32_t *, int, bool);
     87 
     88 time_t retrytimo = RUMPCLIENT_RETRYCONN_ONCE;
     89 
     90 static int
     91 send_with_recon(struct spclient *spc, const void *data, size_t dlen)
     92 {
     93 	struct timeval starttime, curtime;
     94 	time_t prevreconmsg;
     95 	unsigned reconretries;
     96 	int rv;
     97 
     98 	for (prevreconmsg = 0, reconretries = 0;;) {
     99 		rv = dosend(spc, data, dlen);
    100 		if (__predict_false(rv == ENOTCONN || rv == EBADF)) {
    101 			/* no persistent connections */
    102 			if (retrytimo == 0)
    103 				break;
    104 
    105 			if (!prevreconmsg) {
    106 				prevreconmsg = time(NULL);
    107 				gettimeofday(&starttime, NULL);
    108 			}
    109 			if (reconretries == 1) {
    110 				if (retrytimo == RUMPCLIENT_RETRYCONN_ONCE) {
    111 					rv = ENOTCONN;
    112 					break;
    113 				}
    114 				fprintf(stderr, "rump_sp: connection to "
    115 				    "kernel lost, trying to reconnect ...\n");
    116 			} else if (time(NULL) - prevreconmsg > 120) {
    117 				fprintf(stderr, "rump_sp: still trying to "
    118 				    "reconnect ...\n");
    119 				prevreconmsg = time(NULL);
    120 			}
    121 
    122 			/* check that we aren't over the limit */
    123 			if (retrytimo > 0) {
    124 				struct timeval tmp;
    125 
    126 				gettimeofday(&curtime, NULL);
    127 				timersub(&curtime, &starttime, &tmp);
    128 				if (tmp.tv_sec >= retrytimo) {
    129 					fprintf(stderr, "rump_sp: reconnect "
    130 					    "failed, %lld second timeout\n",
    131 					    (long long)retrytimo);
    132 					return ENOTCONN;
    133 				}
    134 			}
    135 
    136 			/* adhoc backoff timer */
    137 			if (reconretries < 10) {
    138 				usleep(100000 * reconretries);
    139 			} else {
    140 				sleep(MIN(10, reconretries-9));
    141 			}
    142 			reconretries++;
    143 
    144 			if ((rv = doconnect(false)) != 0)
    145 				continue;
    146 			if ((rv = handshake_req(&clispc, NULL, 0, true)) != 0)
    147 				continue;
    148 
    149 			/*
    150 			 * ok, reconnect succesful.  we need to return to
    151 			 * the upper layer to get the entire PDU resent.
    152 			 */
    153 			if (reconretries != 1)
    154 				fprintf(stderr, "rump_sp: reconnected!\n");
    155 			rv = EAGAIN;
    156 			break;
    157 		} else {
    158 			_DIAGASSERT(errno != EAGAIN);
    159 			break;
    160 		}
    161 	}
    162 
    163 	return rv;
    164 }
    165 
    166 static int
    167 cliwaitresp(struct spclient *spc, struct respwait *rw, sigset_t *mask,
    168 	bool keeplock)
    169 {
    170 	uint64_t mygen;
    171 	bool imalive = true;
    172 
    173 	pthread_mutex_lock(&spc->spc_mtx);
    174 	if (!keeplock)
    175 		sendunlockl(spc);
    176 	mygen = spc->spc_generation;
    177 
    178 	rw->rw_error = 0;
    179 	while (!rw->rw_done && rw->rw_error == 0) {
    180 		if (__predict_false(spc->spc_generation != mygen || !imalive))
    181 			break;
    182 
    183 		/* are we free to receive? */
    184 		if (spc->spc_istatus == SPCSTATUS_FREE) {
    185 			struct kevent kev[8];
    186 			int gotresp, dosig, rv, i;
    187 
    188 			spc->spc_istatus = SPCSTATUS_BUSY;
    189 			pthread_mutex_unlock(&spc->spc_mtx);
    190 
    191 			dosig = 0;
    192 			for (gotresp = 0; !gotresp; ) {
    193 				switch (readframe(spc)) {
    194 				case 0:
    195 					rv = host_kevent(kq, NULL, 0,
    196 					    kev, __arraycount(kev), NULL);
    197 
    198 					/*
    199 					 * XXX: don't know how this can
    200 					 * happen (timeout cannot expire
    201 					 * since there isn't one), but
    202 					 * it does happen
    203 					 */
    204 					if (__predict_false(rv == 0))
    205 						continue;
    206 
    207 					for (i = 0; i < rv; i++) {
    208 						if (kev[i].filter
    209 						    == EVFILT_SIGNAL)
    210 							dosig++;
    211 					}
    212 					if (dosig)
    213 						goto cleanup;
    214 
    215 					continue;
    216 				case -1:
    217 					imalive = false;
    218 					goto cleanup;
    219 				default:
    220 					break;
    221 				}
    222 
    223 				switch (spc->spc_hdr.rsp_class) {
    224 				case RUMPSP_RESP:
    225 				case RUMPSP_ERROR:
    226 					kickwaiter(spc);
    227 					gotresp = spc->spc_hdr.rsp_reqno ==
    228 					    rw->rw_reqno;
    229 					break;
    230 				case RUMPSP_REQ:
    231 					handlereq(spc);
    232 					break;
    233 				default:
    234 					/* panic */
    235 					break;
    236 				}
    237 			}
    238 
    239  cleanup:
    240 			pthread_mutex_lock(&spc->spc_mtx);
    241 			if (spc->spc_istatus == SPCSTATUS_WANTED)
    242 				kickall(spc);
    243 			spc->spc_istatus = SPCSTATUS_FREE;
    244 
    245 			/* take one for the team */
    246 			if (dosig) {
    247 				pthread_mutex_unlock(&spc->spc_mtx);
    248 				pthread_sigmask(SIG_SETMASK, mask, NULL);
    249 				pthread_sigmask(SIG_SETMASK, &fullset, NULL);
    250 				pthread_mutex_lock(&spc->spc_mtx);
    251 			}
    252 		} else {
    253 			spc->spc_istatus = SPCSTATUS_WANTED;
    254 			pthread_cond_wait(&rw->rw_cv, &spc->spc_mtx);
    255 		}
    256 	}
    257 	TAILQ_REMOVE(&spc->spc_respwait, rw, rw_entries);
    258 	pthread_mutex_unlock(&spc->spc_mtx);
    259 	pthread_cond_destroy(&rw->rw_cv);
    260 
    261 	if (spc->spc_generation != mygen || !imalive) {
    262 		return ENOTCONN;
    263 	}
    264 	return rw->rw_error;
    265 }
    266 
    267 static int
    268 syscall_req(struct spclient *spc, int sysnum,
    269 	const void *data, size_t dlen, void **resp)
    270 {
    271 	struct rsp_hdr rhdr;
    272 	struct respwait rw;
    273 	sigset_t omask;
    274 	int rv;
    275 
    276 	rhdr.rsp_len = sizeof(rhdr) + dlen;
    277 	rhdr.rsp_class = RUMPSP_REQ;
    278 	rhdr.rsp_type = RUMPSP_SYSCALL;
    279 	rhdr.rsp_sysnum = sysnum;
    280 
    281 	pthread_sigmask(SIG_SETMASK, &fullset, &omask);
    282 	do {
    283 		putwait(spc, &rw, &rhdr);
    284 		if ((rv = send_with_recon(spc, &rhdr, sizeof(rhdr))) != 0) {
    285 			unputwait(spc, &rw);
    286 			continue;
    287 		}
    288 		if ((rv = send_with_recon(spc, data, dlen)) != 0) {
    289 			unputwait(spc, &rw);
    290 			continue;
    291 		}
    292 
    293 		rv = cliwaitresp(spc, &rw, &omask, false);
    294 		if (rv == ENOTCONN)
    295 			rv = EAGAIN;
    296 	} while (rv == EAGAIN);
    297 	pthread_sigmask(SIG_SETMASK, &omask, NULL);
    298 
    299 	*resp = rw.rw_data;
    300 	return rv;
    301 }
    302 
    303 static int
    304 handshake_req(struct spclient *spc, uint32_t *auth, int cancel, bool haslock)
    305 {
    306 	struct handshake_fork rf;
    307 	struct rsp_hdr rhdr;
    308 	struct respwait rw;
    309 	sigset_t omask;
    310 	size_t bonus;
    311 	int rv;
    312 
    313 	if (auth) {
    314 		bonus = sizeof(rf);
    315 	} else {
    316 		bonus = strlen(getprogname())+1;
    317 	}
    318 
    319 	/* performs server handshake */
    320 	rhdr.rsp_len = sizeof(rhdr) + bonus;
    321 	rhdr.rsp_class = RUMPSP_REQ;
    322 	rhdr.rsp_type = RUMPSP_HANDSHAKE;
    323 	if (auth)
    324 		rhdr.rsp_handshake = HANDSHAKE_FORK;
    325 	else
    326 		rhdr.rsp_handshake = HANDSHAKE_GUEST;
    327 
    328 	pthread_sigmask(SIG_SETMASK, &fullset, &omask);
    329 	if (haslock)
    330 		putwait_locked(spc, &rw, &rhdr);
    331 	else
    332 		putwait(spc, &rw, &rhdr);
    333 	rv = dosend(spc, &rhdr, sizeof(rhdr));
    334 	if (auth) {
    335 		memcpy(rf.rf_auth, auth, AUTHLEN*sizeof(*auth));
    336 		rf.rf_cancel = cancel;
    337 		rv = send_with_recon(spc, &rf, sizeof(rf));
    338 	} else {
    339 		rv = dosend(spc, getprogname(), strlen(getprogname())+1);
    340 	}
    341 	if (rv || cancel) {
    342 		if (haslock)
    343 			unputwait_locked(spc, &rw);
    344 		else
    345 			unputwait(spc, &rw);
    346 		if (cancel) {
    347 			pthread_sigmask(SIG_SETMASK, &omask, NULL);
    348 			return rv;
    349 		}
    350 	} else {
    351 		rv = cliwaitresp(spc, &rw, &omask, haslock);
    352 	}
    353 	pthread_sigmask(SIG_SETMASK, &omask, NULL);
    354 	if (rv)
    355 		return rv;
    356 
    357 	rv = *(int *)rw.rw_data;
    358 	free(rw.rw_data);
    359 
    360 	return rv;
    361 }
    362 
    363 static int
    364 prefork_req(struct spclient *spc, void **resp)
    365 {
    366 	struct rsp_hdr rhdr;
    367 	struct respwait rw;
    368 	sigset_t omask;
    369 	int rv;
    370 
    371 	rhdr.rsp_len = sizeof(rhdr);
    372 	rhdr.rsp_class = RUMPSP_REQ;
    373 	rhdr.rsp_type = RUMPSP_PREFORK;
    374 	rhdr.rsp_error = 0;
    375 
    376 	pthread_sigmask(SIG_SETMASK, &fullset, &omask);
    377 	do {
    378 		putwait(spc, &rw, &rhdr);
    379 		rv = send_with_recon(spc, &rhdr, sizeof(rhdr));
    380 		if (rv != 0) {
    381 			unputwait(spc, &rw);
    382 			continue;
    383 		}
    384 
    385 		rv = cliwaitresp(spc, &rw, &omask, false);
    386 		if (rv == ENOTCONN)
    387 			rv = EAGAIN;
    388 	} while (rv == EAGAIN);
    389 	pthread_sigmask(SIG_SETMASK, &omask, NULL);
    390 
    391 	*resp = rw.rw_data;
    392 	return rv;
    393 }
    394 
    395 /*
    396  * prevent response code from deadlocking with reconnect code
    397  */
    398 static int
    399 resp_sendlock(struct spclient *spc)
    400 {
    401 	int rv = 0;
    402 
    403 	pthread_mutex_lock(&spc->spc_mtx);
    404 	while (spc->spc_ostatus != SPCSTATUS_FREE) {
    405 		if (__predict_false(spc->spc_reconnecting)) {
    406 			rv = EBUSY;
    407 			goto out;
    408 		}
    409 		spc->spc_ostatus = SPCSTATUS_WANTED;
    410 		pthread_cond_wait(&spc->spc_cv, &spc->spc_mtx);
    411 	}
    412 	spc->spc_ostatus = SPCSTATUS_BUSY;
    413 
    414  out:
    415 	pthread_mutex_unlock(&spc->spc_mtx);
    416 	return rv;
    417 }
    418 
    419 static void
    420 send_copyin_resp(struct spclient *spc, uint64_t reqno, void *data, size_t dlen,
    421 	int wantstr)
    422 {
    423 	struct rsp_hdr rhdr;
    424 
    425 	if (wantstr)
    426 		dlen = MIN(dlen, strlen(data)+1);
    427 
    428 	rhdr.rsp_len = sizeof(rhdr) + dlen;
    429 	rhdr.rsp_reqno = reqno;
    430 	rhdr.rsp_class = RUMPSP_RESP;
    431 	rhdr.rsp_type = RUMPSP_COPYIN;
    432 	rhdr.rsp_sysnum = 0;
    433 
    434 	if (resp_sendlock(spc) != 0)
    435 		return;
    436 	(void)dosend(spc, &rhdr, sizeof(rhdr));
    437 	(void)dosend(spc, data, dlen);
    438 	sendunlock(spc);
    439 }
    440 
    441 static void
    442 send_anonmmap_resp(struct spclient *spc, uint64_t reqno, void *addr)
    443 {
    444 	struct rsp_hdr rhdr;
    445 
    446 	rhdr.rsp_len = sizeof(rhdr) + sizeof(addr);
    447 	rhdr.rsp_reqno = reqno;
    448 	rhdr.rsp_class = RUMPSP_RESP;
    449 	rhdr.rsp_type = RUMPSP_ANONMMAP;
    450 	rhdr.rsp_sysnum = 0;
    451 
    452 	if (resp_sendlock(spc) != 0)
    453 		return;
    454 	(void)dosend(spc, &rhdr, sizeof(rhdr));
    455 	(void)dosend(spc, &addr, sizeof(addr));
    456 	sendunlock(spc);
    457 }
    458 
    459 int
    460 rumpclient_syscall(int sysnum, const void *data, size_t dlen,
    461 	register_t *retval)
    462 {
    463 	struct rsp_sysresp *resp;
    464 	void *rdata;
    465 	int rv;
    466 
    467 	DPRINTF(("rumpsp syscall_req: syscall %d with %p/%zu\n",
    468 	    sysnum, data, dlen));
    469 
    470 	rv = syscall_req(&clispc, sysnum, data, dlen, &rdata);
    471 	if (rv)
    472 		return rv;
    473 
    474 	resp = rdata;
    475 	DPRINTF(("rumpsp syscall_resp: syscall %d error %d, rv: %d/%d\n",
    476 	    sysnum, rv, resp->rsys_retval[0], resp->rsys_retval[1]));
    477 
    478 	memcpy(retval, &resp->rsys_retval, sizeof(resp->rsys_retval));
    479 	rv = resp->rsys_error;
    480 	free(rdata);
    481 
    482 	return rv;
    483 }
    484 
    485 static void
    486 handlereq(struct spclient *spc)
    487 {
    488 	struct rsp_copydata *copydata;
    489 	struct rsp_hdr *rhdr = &spc->spc_hdr;
    490 	void *mapaddr;
    491 	size_t maplen;
    492 	int reqtype = spc->spc_hdr.rsp_type;
    493 
    494 	switch (reqtype) {
    495 	case RUMPSP_COPYIN:
    496 	case RUMPSP_COPYINSTR:
    497 		/*LINTED*/
    498 		copydata = (struct rsp_copydata *)spc->spc_buf;
    499 		DPRINTF(("rump_sp handlereq: copyin request: %p/%zu\n",
    500 		    copydata->rcp_addr, copydata->rcp_len));
    501 		send_copyin_resp(spc, spc->spc_hdr.rsp_reqno,
    502 		    copydata->rcp_addr, copydata->rcp_len,
    503 		    reqtype == RUMPSP_COPYINSTR);
    504 		break;
    505 	case RUMPSP_COPYOUT:
    506 	case RUMPSP_COPYOUTSTR:
    507 		/*LINTED*/
    508 		copydata = (struct rsp_copydata *)spc->spc_buf;
    509 		DPRINTF(("rump_sp handlereq: copyout request: %p/%zu\n",
    510 		    copydata->rcp_addr, copydata->rcp_len));
    511 		/*LINTED*/
    512 		memcpy(copydata->rcp_addr, copydata->rcp_data,
    513 		    copydata->rcp_len);
    514 		break;
    515 	case RUMPSP_ANONMMAP:
    516 		/*LINTED*/
    517 		maplen = *(size_t *)spc->spc_buf;
    518 		mapaddr = mmap(NULL, maplen, PROT_READ|PROT_WRITE,
    519 		    MAP_ANON, -1, 0);
    520 		if (mapaddr == MAP_FAILED)
    521 			mapaddr = NULL;
    522 		DPRINTF(("rump_sp handlereq: anonmmap: %p\n", mapaddr));
    523 		send_anonmmap_resp(spc, spc->spc_hdr.rsp_reqno, mapaddr);
    524 		break;
    525 	case RUMPSP_RAISE:
    526 		DPRINTF(("rump_sp handlereq: raise sig %d\n", rhdr->rsp_signo));
    527 		raise((int)rhdr->rsp_signo);
    528 		/*
    529 		 * We most likely have signals blocked, but the signal
    530 		 * will be handled soon enough when we return.
    531 		 */
    532 		break;
    533 	default:
    534 		printf("PANIC: INVALID TYPE %d\n", reqtype);
    535 		abort();
    536 		break;
    537 	}
    538 
    539 	spcfreebuf(spc);
    540 }
    541 
    542 static unsigned ptab_idx;
    543 static struct sockaddr *serv_sa;
    544 
    545 static int
    546 doconnect(bool noisy)
    547 {
    548 	struct respwait rw;
    549 	struct rsp_hdr rhdr;
    550 	struct kevent kev[NSIG+1];
    551 	char banner[MAXBANNER];
    552 	struct pollfd pfd;
    553 	int s, error, flags, i;
    554 	ssize_t n;
    555 
    556 	if (kq != -1)
    557 		host_close(kq);
    558 	kq = -1;
    559 	s = -1;
    560 
    561 	if (clispc.spc_fd != -1)
    562 		host_close(clispc.spc_fd);
    563 	clispc.spc_fd = -1;
    564 
    565 	/*
    566 	 * for reconnect, gate everyone out of the receiver code
    567 	 */
    568 	putwait_locked(&clispc, &rw, &rhdr);
    569 
    570 	pthread_mutex_lock(&clispc.spc_mtx);
    571 	clispc.spc_reconnecting = 1;
    572 	pthread_cond_broadcast(&clispc.spc_cv);
    573 	clispc.spc_generation++;
    574 	while (clispc.spc_istatus != SPCSTATUS_FREE) {
    575 		clispc.spc_istatus = SPCSTATUS_WANTED;
    576 		pthread_cond_wait(&rw.rw_cv, &clispc.spc_mtx);
    577 	}
    578 	kickall(&clispc);
    579 
    580 	/*
    581 	 * we can release it already since we hold the
    582 	 * send lock during reconnect
    583 	 * XXX: assert it
    584 	 */
    585 	clispc.spc_istatus = SPCSTATUS_FREE;
    586 	pthread_mutex_unlock(&clispc.spc_mtx);
    587 	unputwait_locked(&clispc, &rw);
    588 
    589 	free(clispc.spc_buf);
    590 	clispc.spc_off = 0;
    591 
    592 	s = host_socket(parsetab[ptab_idx].domain, SOCK_STREAM, 0);
    593 	if (s == -1)
    594 		return -1;
    595 
    596 	pfd.fd = s;
    597 	pfd.events = POLLIN;
    598 	while (host_connect(s, serv_sa, (socklen_t)serv_sa->sa_len) == -1) {
    599 		if (errno == EINTR)
    600 			continue;
    601 		error = errno;
    602 		if (noisy)
    603 			fprintf(stderr, "rump_sp: client connect failed: %s\n",
    604 			    strerror(errno));
    605 		errno = error;
    606 		return -1;
    607 	}
    608 
    609 	if ((error = parsetab[ptab_idx].connhook(s)) != 0) {
    610 		error = errno;
    611 		if (noisy)
    612 			fprintf(stderr, "rump_sp: connect hook failed\n");
    613 		errno = error;
    614 		return -1;
    615 	}
    616 
    617 	if ((n = host_read(s, banner, sizeof(banner)-1)) < 0) {
    618 		error = errno;
    619 		if (noisy)
    620 			fprintf(stderr, "rump_sp: failed to read banner\n");
    621 		errno = error;
    622 		return -1;
    623 	}
    624 
    625 	if (banner[n-1] != '\n') {
    626 		if (noisy)
    627 			fprintf(stderr, "rump_sp: invalid banner\n");
    628 		errno = EINVAL;
    629 		return -1;
    630 	}
    631 	banner[n] = '\0';
    632 	/* parse the banner some day */
    633 
    634 	flags = host_fcntl(s, F_GETFL, 0);
    635 	if (host_fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) {
    636 		if (noisy)
    637 			fprintf(stderr, "rump_sp: socket fd NONBLOCK: %s\n",
    638 			    strerror(errno));
    639 		errno = EINVAL;
    640 		return -1;
    641 	}
    642 	clispc.spc_fd = s;
    643 	clispc.spc_state = SPCSTATE_RUNNING;
    644 	clispc.spc_reconnecting = 0;
    645 
    646 	/* setup kqueue, we want all signals and the fd */
    647 	if ((kq = host_kqueue()) == -1) {
    648 		error = errno;
    649 		if (noisy)
    650 			fprintf(stderr, "rump_sp: cannot setup kqueue");
    651 		errno = error;
    652 		return -1;
    653 	}
    654 
    655 	for (i = 0; i < NSIG; i++) {
    656 		EV_SET(&kev[i], i+1, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, 0);
    657 	}
    658 	EV_SET(&kev[NSIG], clispc.spc_fd,
    659 	    EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, 0);
    660 	if (host_kevent(kq, kev, NSIG+1, NULL, 0, NULL) == -1) {
    661 		error = errno;
    662 		if (noisy)
    663 			fprintf(stderr, "rump_sp: kevent() failed");
    664 		errno = error;
    665 		return -1;
    666 	}
    667 
    668 	return 0;
    669 }
    670 
    671 static int
    672 doinit(void)
    673 {
    674 
    675 	TAILQ_INIT(&clispc.spc_respwait);
    676 	pthread_mutex_init(&clispc.spc_mtx, NULL);
    677 	pthread_cond_init(&clispc.spc_cv, NULL);
    678 
    679 	return 0;
    680 }
    681 
    682 void *(*rumpclient_dlsym)(void *, const char *);
    683 
    684 int
    685 rumpclient_init()
    686 {
    687 	char *p;
    688 	int error;
    689 
    690 	/* dlsym overrided by rumphijack? */
    691 	if (!rumpclient_dlsym)
    692 		rumpclient_dlsym = dlsym;
    693 
    694 	/*
    695 	 * sag mir, wo die symbol sind.  zogen fort, der krieg beginnt.
    696 	 * wann wird man je verstehen?  wann wird man je verstehen?
    697 	 */
    698 #define FINDSYM2(_name_,_syscall_)					\
    699 	if ((host_##_name_ = rumpclient_dlsym(RTLD_NEXT,		\
    700 	    #_syscall_)) == NULL)					\
    701 		/* host_##_name_ = _syscall_ */;
    702 #define FINDSYM(_name_) FINDSYM2(_name_,_name_)
    703 	FINDSYM2(socket,__socket30);
    704 	FINDSYM(close);
    705 	FINDSYM(connect);
    706 	FINDSYM(fcntl);
    707 	FINDSYM(poll);
    708 	FINDSYM(read);
    709 	FINDSYM(sendto);
    710 	FINDSYM(setsockopt);
    711 	FINDSYM(kqueue);
    712 #if !__NetBSD_Prereq__(5,99,7)
    713 	FINDSYM(kevent);
    714 #else
    715 	FINDSYM2(kevent,_sys___kevent50);
    716 #endif
    717 #undef	FINDSYM
    718 #undef	FINDSY2
    719 
    720 	if ((p = getenv("RUMP_SERVER")) == NULL) {
    721 		errno = ENOENT;
    722 		return -1;
    723 	}
    724 
    725 	if ((error = parseurl(p, &serv_sa, &ptab_idx, 0)) != 0) {
    726 		errno = error;
    727 		return -1;
    728 	}
    729 
    730 	if (doinit() == -1)
    731 		return -1;
    732 	if (doconnect(true) == -1)
    733 		return -1;
    734 
    735 	error = handshake_req(&clispc, NULL, 0, false);
    736 	if (error) {
    737 		pthread_mutex_destroy(&clispc.spc_mtx);
    738 		pthread_cond_destroy(&clispc.spc_cv);
    739 		if (clispc.spc_fd != -1)
    740 			host_close(clispc.spc_fd);
    741 		errno = error;
    742 		return -1;
    743 	}
    744 
    745 	sigfillset(&fullset);
    746 	return 0;
    747 }
    748 
    749 struct rumpclient_fork {
    750 	uint32_t fork_auth[AUTHLEN];
    751 };
    752 
    753 struct rumpclient_fork *
    754 rumpclient_prefork(void)
    755 {
    756 	struct rumpclient_fork *rpf;
    757 	void *resp;
    758 	int rv;
    759 
    760 	rpf = malloc(sizeof(*rpf));
    761 	if (rpf == NULL)
    762 		return NULL;
    763 
    764 	if ((rv = prefork_req(&clispc, &resp)) != 0) {
    765 		free(rpf);
    766 		errno = rv;
    767 		return NULL;
    768 	}
    769 
    770 	memcpy(rpf->fork_auth, resp, sizeof(rpf->fork_auth));
    771 	free(resp);
    772 
    773 	return rpf;
    774 }
    775 
    776 int
    777 rumpclient_fork_init(struct rumpclient_fork *rpf)
    778 {
    779 	int error;
    780 
    781 	memset(&clispc, 0, sizeof(clispc));
    782 	clispc.spc_fd = -1;
    783 	kq = -1;
    784 
    785 	if (doinit() == -1)
    786 		return -1;
    787 	if (doconnect(false) == -1)
    788 		return -1;
    789 
    790 	error = handshake_req(&clispc, rpf->fork_auth, 0, false);
    791 	if (error) {
    792 		pthread_mutex_destroy(&clispc.spc_mtx);
    793 		pthread_cond_destroy(&clispc.spc_cv);
    794 		errno = error;
    795 		return -1;
    796 	}
    797 
    798 	return 0;
    799 }
    800 
    801 void
    802 rumpclient_setconnretry(time_t timeout)
    803 {
    804 
    805 	if (timeout < RUMPCLIENT_RETRYCONN_ONCE)
    806 		return; /* gigo */
    807 
    808 	retrytimo = timeout;
    809 }
    810