newtmcd.c 23.4 KB
Newer Older
1
/*
2
 * Copyright (c) 2000-2011 University of Utah and the Flux Group.
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
 * 
 * {{{EMULAB-LICENSE
 * 
 * This file is part of the Emulab network testbed software.
 * 
 * This file is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * This file is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this file.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * }}}
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include <signal.h>
#include <stdarg.h>
#include <assert.h>
#include <sys/wait.h>
#include <sys/fcntl.h>
#include <sys/syscall.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <paths.h>
#include <setjmp.h>
#include <pwd.h>
#include <grp.h>
48
#include "tmcd.h"
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
#include "config.h"
#include "ssl.h"
#include "log.h"
#include "tbdefs.h"
#include "bootwhat.h"
#include "bootinfo.h"
#include "libtmcd.h"

#define RUNASUSER	"nobody"
#define RUNASGROUP	"nobody"

/* socket read/write timeouts in ms */
#define READTIMO	3000
#define WRITETIMO	3000

#define TESTMODE

int		debug = 0;
static int	verbose = 0;
static int	insecure = 0;
static int	byteswritten = 0;
static struct in_addr myipaddr;
static void	tcpserver(int sock, int portnum);
static void	udpserver(int sock, int portnum);
static int      handle_request(int, struct sockaddr_in *, char *, int);
static int	makesockets(int portnum, int *udpsockp, int *tcpsockp);
int		client_writeback(int sock, void *buf, int len, int tcp);
void		client_writeback_done(int sock, struct sockaddr_in *client);

/* socket timeouts */
static int	readtimo = READTIMO;
static int	writetimo = WRITETIMO;

/* thread support */
#define MAXCHILDREN	20
#define MINCHILDREN	8
static int	numchildren;
static int	maxchildren       = 13;
static int      num_udpservers    = 3;
static int      num_altudpservers = 1;
static int      num_alttcpservers = 1;
static int	mypid;
static volatile int killme;



char *usagestr = 
 "usage: tmcd [-d] [-p #]\n"
 " -d              Turn on debugging. Multiple -d options increase output\n"
 " -p portnum	   Specify a port number to listen on\n"
 " -c num	   Specify number of servers (must be %d <= x <= %d)\n"
 " -v              More verbose logging\n"
 " -i ipaddr       Sets the boss IP addr to return (for multi-homed servers)\n"
 "\n";

void
usage()
{
	fprintf(stderr, usagestr, MINCHILDREN, MAXCHILDREN);
	exit(1);
}

static void
cleanup()
{
	signal(SIGHUP, SIG_IGN);
	killme = 1;
	killpg(0, SIGHUP);
}

static void
setverbose(int sig)
{
	signal(sig, SIG_IGN);
	
	if (sig == SIGUSR1)
		verbose = 1;
	else
		verbose = 0;
	info("verbose logging turned %s\n", verbose ? "on" : "off");

	/* Just the parent sends this */
	if (numchildren)
		killpg(0, sig);
	signal(sig, setverbose);
}

int
main(int argc, char **argv)
{
	int			tcpsock, udpsock, i, ch;
	int			alttcpsock, altudpsock;
	int			status, pid;
	int			portnum = TBSERVER_PORT;
	FILE			*fp;
	char			buf[BUFSIZ];
	struct hostent		*he;
	extern char		build_info[];
	int			server_counts[4]; /* udp,tcp,altudp,alttcp */
	struct {
		int	pid;
		int	which;
	} servers[MAXCHILDREN];

	while ((ch = getopt(argc, argv, "dp:c:Xvi:")) != -1)
		switch(ch) {
		case 'p':
			portnum = atoi(optarg);
			break;
		case 'd':
			debug++;
			break;
		case 'c':
			maxchildren = atoi(optarg);
			break;
		case 'X':
			insecure = 1;
			break;
		case 'v':
			verbose++;
			break;
		case 'i':
			if (inet_aton(optarg, &myipaddr) == 0) {
				fprintf(stderr, "invalid IP address %s\n",
					optarg);
				usage();
			}
			break;
		case 'h':
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc)
		usage();
	if (maxchildren < MINCHILDREN || maxchildren > MAXCHILDREN)
		usage();

#ifdef  WITHSSL
	if (tmcd_server_sslinit()) {
		error("SSL init failed!\n");
		exit(1);
	}
#endif
	if (debug) 
		loginit(0, 0);
	else {
		/* Become a daemon */
		daemon(0, 0);
		loginit(1, "tmcd");
	}
	info("daemon starting (version %d)\n", CURRENT_VERSION);
	info("%s\n", build_info);

	/*
	 * Grab our IP for security check below.
	 */
	if (myipaddr.s_addr == 0) {
#ifdef	LBS
		strcpy(buf, BOSSNODE);
#else
		if (gethostname(buf, sizeof(buf)) < 0)
			pfatal("getting hostname");
#endif
		if ((he = gethostbyname(buf)) == NULL) {
			error("Could not get IP (%s) - %s\n",
			      buf, hstrerror(h_errno));
			exit(1);
		}
		memcpy((char *)&myipaddr, he->h_addr, he->h_length);
	}

	/*
	 * If we were given a port on the command line, don't open the 
	 * alternate ports
	 */
	if (portnum != TBSERVER_PORT) {
	    if (makesockets(portnum, &udpsock, &tcpsock) < 0) {
		error("Could not make sockets!");
		exit(1);
	    }
	    num_alttcpservers = num_altudpservers = 0;
	} else {
	    if (makesockets(portnum, &udpsock, &tcpsock) < 0 ||
		makesockets(TBSERVER_PORT2, &altudpsock, &alttcpsock) < 0) {
		    error("Could not make sockets!");
		    exit(1);
	    }
	}

	signal(SIGTERM, cleanup);
	signal(SIGINT, cleanup);
	signal(SIGHUP, cleanup);
	signal(SIGUSR1, setverbose);
	signal(SIGUSR2, setverbose);

	/*
	 * Stash the pid away.
	 */
	mypid = getpid();
	sprintf(buf, "%s/tmcd.pid", _PATH_VARRUN);
	fp = fopen(buf, "w");
	if (fp != NULL) {
		fprintf(fp, "%d\n", mypid);
		(void) fclose(fp);
	}

	/*
	 * Change to non-root user!
	 */
	if (geteuid() == 0) {
		struct passwd	*pw;
		uid_t		uid;
		gid_t		gid;

		/*
		 * Must be a valid user of course.
		 */
		if ((pw = getpwnam(RUNASUSER)) == NULL) {
			error("invalid user: %s", RUNASUSER);
			exit(1);
		}
		uid = pw->pw_uid;
		gid = pw->pw_gid;

		if (setgroups(1, &gid)) {
			errorc("setgroups");
			exit(1);
		}
		if (setgid(gid)) {
			errorc("setgid");
			exit(1);
		}
		if (setuid(uid)) {
			errorc("setuid");
			exit(1);
		}
		info("Flipped to user/group %d/%d\n", uid, gid);
	}

	/*
	 * Now fork a set of children to handle requests. We keep the
	 * pool at a set level. There are 4 types of servers, each getting
	 * a different number of servers. We do it this cause otherwise
	 * we have to deal with the select storm problem; a bunch of processes
	 * select on the same set of file descriptors, and all get woken up
	 * when something comes in, then all read from the socket but only
	 * one gets it and the others go back to sleep. There are various ways
	 * to deal with this problem, but all of them are a lot more code!
	 */
	server_counts[0] = num_udpservers;
	server_counts[1] = num_altudpservers;
	server_counts[2] = num_alttcpservers;
	server_counts[3] = maxchildren -
		(num_udpservers + num_altudpservers + num_altudpservers);
	bzero(servers, sizeof(servers));
	
	while (1) {
		while (!killme && numchildren < maxchildren) {
			int which = 3;
			
			/*
			 * Find which kind of server is short one.
			 */
			for (i = 0; i < 4; i++) {
				if (server_counts[i]) {
					which = i;
					break;
				}
			}
			
			if ((pid = fork()) < 0) {
				errorc("forking server");
				goto done;
			}
			if (pid) {
				server_counts[which]--;
				/*
				 * Find free slot
				 */
				for (i = 0; i < maxchildren; i++) {
					if (!servers[i].pid)
						break;
				}
				servers[i].pid   = pid;
				servers[i].which = which;
				numchildren++;
				continue;
			}
			/* Poor way of knowing parent/child */
			numchildren = 0;
			mypid = getpid();
			
			/* Child does useful work! Never Returns! */
			signal(SIGTERM, SIG_DFL);
			signal(SIGINT, SIG_DFL);
			signal(SIGHUP, SIG_DFL);
			
			switch (which) {
			case 0: udpserver(udpsock, portnum);
				break;
			case 1: udpserver(altudpsock, TBSERVER_PORT2);
				break;
			case 2: tcpserver(alttcpsock, TBSERVER_PORT2);
				break;
			case 3: tcpserver(tcpsock, portnum);
				break;
			}
			exit(-1);
		}

		/*
		 * Parent waits.
		 */
		pid = waitpid(-1, &status, 0);
		if (pid < 0) {
			errorc("waitpid failed");
			continue;
		} 
		if (WIFSIGNALED(status)) {
			error("server %d exited with signal %d!\n",
			      pid, WTERMSIG(status));
		}
		else if (WIFEXITED(status)) {
			error("server %d exited with status %d!\n",
			      pid, WEXITSTATUS(status));	  
		}
		numchildren--;

		/*
		 * Figure out which and what kind of server it was that died.
		 */
		for (i = 0; i < maxchildren; i++) {
			if (servers[i].pid == pid) {
				servers[i].pid = 0;
				server_counts[servers[i].which]++;
				break;
			}
		}
		if (killme && !numchildren)
			break;
	}
 done:
	CLOSE(tcpsock);
	close(udpsock);
	info("daemon terminating\n");
	exit(0);
}

/*
 * Create sockets on specified port.
 */
static int
makesockets(int portnum, int *udpsockp, int *tcpsockp)
{
	struct sockaddr_in	name;
	int			length, i, udpsock, tcpsock;

	/*
	 * Setup TCP socket for incoming connections.
	 */

	/* Create socket from which to read. */
	tcpsock = socket(AF_INET, SOCK_STREAM, 0);
	if (tcpsock < 0) {
		pfatal("opening stream socket");
	}

	i = 1;
	if (setsockopt(tcpsock, SOL_SOCKET, SO_REUSEADDR,
		       (char *)&i, sizeof(i)) < 0)
		pwarning("setsockopt(SO_REUSEADDR)");;
	
	/* Create name. */
	name.sin_family = AF_INET;
	name.sin_addr.s_addr = INADDR_ANY;
	name.sin_port = htons((u_short) portnum);
	if (bind(tcpsock, (struct sockaddr *) &name, sizeof(name))) {
		pfatal("binding stream socket");
	}
	/* Find assigned port value and print it out. */
	length = sizeof(name);
	if (getsockname(tcpsock, (struct sockaddr *) &name, &length)) {
		pfatal("getsockname");
	}
	if (listen(tcpsock, 128) < 0) {
		pfatal("listen");
	}
	info("listening on TCP port %d\n", ntohs(name.sin_port));
	
	/*
	 * Setup UDP socket
	 */

	/* Create socket from which to read. */
	udpsock = socket(AF_INET, SOCK_DGRAM, 0);
	if (udpsock < 0) {
		pfatal("opening dgram socket");
	}

	i = 1;
	if (setsockopt(udpsock, SOL_SOCKET, SO_REUSEADDR,
		       (char *)&i, sizeof(i)) < 0)
		pwarning("setsockopt(SO_REUSEADDR)");;

	i = 128 * 1024;
	if (setsockopt(udpsock, SOL_SOCKET, SO_RCVBUF, &i, sizeof(i)) < 0)
		pwarning("setsockopt(SO_RCVBUF)");
	
	/* Create name. */
	name.sin_family = AF_INET;
	name.sin_addr.s_addr = INADDR_ANY;
	name.sin_port = htons((u_short) portnum);
	if (bind(udpsock, (struct sockaddr *) &name, sizeof(name))) {
		pfatal("binding dgram socket");
	}

	/* Find assigned port value and print it out. */
	length = sizeof(name);
	if (getsockname(udpsock, (struct sockaddr *) &name, &length)) {
		pfatal("getsockname");
	}
	info("listening on UDP port %d\n", ntohs(name.sin_port));

	*tcpsockp = tcpsock;
	*udpsockp = udpsock;
	return 0;
}

/*
 * Listen for UDP requests. This is not a secure channel, and so this should
 * eventually be killed off.
 */
static void
udpserver(int sock, int portnum)
{
	char			buf[MYBUFSIZE];
	struct sockaddr_in	client;
	int			length, cc;
	unsigned int		nreq = 0;
	
	info("udpserver starting: pid=%d sock=%d portnum=%d\n",
	     mypid, sock, portnum);

	/*
	 * Wait for udp connections.
	 */
	while (1) {
		setproctitle("UDP %d: %u done", portnum, nreq);
		length = sizeof(client);		
		cc = recvfrom(sock, buf, sizeof(buf) - 1,
			      0, (struct sockaddr *)&client, &length);
		if (cc <= 0) {
			if (cc < 0)
				errorc("Reading UDP request");
			error("UDP Connection aborted\n");
			continue;
		}
		buf[cc] = '\0';
		handle_request(sock, &client, buf, 0);
		nreq++;
	}
	exit(1);
}

int
tmcd_accept(int sock, struct sockaddr *addr, socklen_t *addrlen, int ms)
{
	int	newsock;

	if ((newsock = accept(sock, addr, addrlen)) < 0)
		return -1;

	/*
	 * Set timeout value to keep us from hanging due to a
	 * malfunctioning or malicious client.
	 */
	if (ms > 0) {
		struct timeval tv;

		tv.tv_sec = ms / 1000;
		tv.tv_usec = (ms % 1000) * 1000;
		if (setsockopt(newsock, SOL_SOCKET, SO_RCVTIMEO,
			       &tv, sizeof(tv)) < 0) {
			errorc("setting SO_RCVTIMEO");
		}
	}

	return newsock;
}

/*
 * Listen for TCP requests.
 */
static void
tcpserver(int sock, int portnum)
{
	char			buf[MAXTMCDPACKET];
	struct sockaddr_in	client;
	int			length, cc, newsock;
	unsigned int		nreq = 0;
	struct timeval		tv;
	
	info("tcpserver starting: pid=%d sock=%d portnum=%d\n",
	     mypid, sock, portnum);

	/*
	 * Wait for TCP connections.
	 */
	while (1) {
		setproctitle("TCP %d: %u done", portnum, nreq);
		length  = sizeof(client);
		newsock = ACCEPT(sock, (struct sockaddr *)&client, &length,
				 readtimo);
		if (newsock < 0) {
			errorc("accepting TCP connection");
			continue;
		}

		/*
		 * Set write timeout value to keep us from hanging due to a
		 * malfunctioning or malicious client.
		 * NOTE: ACCEPT function sets read timeout.
		 */
		tv.tv_sec = writetimo / 1000;
		tv.tv_usec = (writetimo % 1000) * 1000;
		if (setsockopt(newsock, SOL_SOCKET, SO_SNDTIMEO,
			       &tv, sizeof(tv)) < 0) {
			errorc("setting SO_SNDTIMEO");
			CLOSE(newsock);
			continue;
		}

		/*
		 * Read in the command request.
		 */
		if ((cc = READ(newsock, buf, sizeof(buf) - 1)) <= 0) {
			if (cc < 0) {
				if (errno == EWOULDBLOCK)
					errorc("Timeout reading TCP request");
				else
					errorc("Error reading TCP request");
			}
			error("TCP connection aborted\n");
			CLOSE(newsock);
			continue;
		}
		buf[cc] = '\0';
		handle_request(newsock, &client, buf, 1);
		CLOSE(newsock);
		nreq++;
	}
	exit(1);
}


/*
 * Hack to test timeouts and other anomolous situations for tmcc
 */
 /* XXX Ryan finish this */
#if 0
XML_COMMAND_PROTOTYPE(dotmcctest)
{
	char		buf[MYBUFSIZE];
	int		logit;

	logit = verbose;

	if (logit)
		info("TMCCTEST: %s\n", rdata);

	/*
	 * Always allow the test that doesn't tie up a server thread
	 */
	if (strncmp(rdata, "noreply", strlen("noreply")) == 0)
		return 0;

	/*
	 * The rest can tie up a server thread for non-trivial amounts of
	 * time, only allow if debugging.
	 */
	if (!debug) {
		strcpy(buf, "tmcctest disabled\n");
		goto doit;
	}

	/*
	 * Delay reply by the indicated amount of time
	 */
	if (strncmp(rdata, "delayreply", strlen("delayreply")) == 0) {
		int delay = 0;
		if (sscanf(rdata, "delayreply %d", &delay) == 1 &&
		    delay < 20) {
			sleep(delay);
			sprintf(buf, "replied after %d seconds\n", delay);
		} else {
			strcpy(buf, "bogus delay value\n");
		}
		goto doit;
	}

	if (tcp) {
		/*
		 * Reply in pieces
		 */
		if (strncmp(rdata, "splitreply", strlen("splitreply")) == 0) {
			memset(buf, '1', MYBUFSIZE/4);
			buf[MYBUFSIZE/4] = 0;
			client_writeback(sock, buf, strlen(buf), tcp);
			sleep(1);
			memset(buf, '2', MYBUFSIZE/4);
			buf[MYBUFSIZE/4] = 0;
			client_writeback(sock, buf, strlen(buf), tcp);
			sleep(2);
			memset(buf, '4', MYBUFSIZE/4);
			buf[MYBUFSIZE/4] = 0;
			client_writeback(sock, buf, strlen(buf), tcp);
			sleep(4);
			memset(buf, '0', MYBUFSIZE/4);
			buf[MYBUFSIZE/4-1] = '\n';
			buf[MYBUFSIZE/4] = 0;
			logit = 0;
		} else {
			strcpy(buf, "no such TCP test\n");
		}
	} else {
		strcpy(buf, "no such UDP test\n");
	}

 doit:
	client_writeback(sock, buf, strlen(buf), tcp);
	if (logit)
		info("%s", buf);
	return 0;
}
#endif

static int
handle_request(int sock, struct sockaddr_in *client, char *rdata, int istcp)
{
	struct sockaddr_in redirect_client;
	int		   redirect = 0, havekey = 0;
	char		   *cp, *bp;
	char		   privkey[TBDB_FLEN_PRIVKEY];
	char		   buf[MYBUFSIZE];
	int		   i = 0, err = 0;
	int		   version = DEFAULT_VERSION;
	tmcdreq_t	   tmcdreq, *reqp = &tmcdreq;
	tmcdresp_t	   *response = NULL;

	byteswritten = 0;
#ifdef	WITHSSL
	cp = (istcp ? (isssl ? "SSL" : "TCP") : "UDP");
#else
	cp = (istcp ? "TCP" : "UDP");
#endif
	setproctitle("%s: %s", inet_ntoa(client->sin_addr), cp);

	/*
	 * Init the req structure.
	 */
	bzero(reqp, sizeof(*reqp));

	/*
	 * Look for special tags. 
	 */
	bp = rdata;
	while ((bp = strsep(&rdata, " ")) != NULL) {
		/*
		 * Look for PRIVKEY. 
		 */
		if (sscanf(bp, "PRIVKEY=%64s", buf)) {
724 725 726 727 728 729 730
			for (i = 0; i < strlen(buf); i++){
				if (! isxdigit(buf[i])) {
					info("tmcd client provided invalid "
					     "characters in privkey");
					goto skipit;
				}
			}
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
			havekey = 1;
			strncpy(privkey, buf, sizeof(privkey));

			if (debug) {
				info("PRIVKEY %s\n", buf);
			}
			continue;
		}


		/*
		 * Look for VERSION. 
		 * Check for clients that are newer than the server
		 * and complain.
		 */
		if (sscanf(bp, "VERSION=%d", &i) == 1) {
			version = i;
			if (version > CURRENT_VERSION) {
				error("version skew on request from %s: "
				      "server=%d, request=%d, "
				      "old TMCD installed?\n",
				      inet_ntoa(client->sin_addr),
				      CURRENT_VERSION, version);
			}
			continue;
		}
		reqp->version = version;

		/*
		 * Look for REDIRECT, which is a proxy request for a
		 * client other than the one making the request. Good
		 * for testing. Might become a general tmcd redirect at
		 * some point, so that we can test new tmcds.
		 */
		if (sscanf(bp, "REDIRECT=%30s", buf)) {
			redirect_client = *client;
			redirect        = 1;
			inet_aton(buf, &client->sin_addr);

			info("REDIRECTED from %s to %s\n",
			     inet_ntoa(redirect_client.sin_addr), buf);

			continue;
		}
		
		/*
		 * Look for VNODE. This is used for virtual nodes.
		 * It indicates which of the virtual nodes (on the physical
		 * node) is talking to us. Currently no perm checking.
		 * Very temporary approach; should be done via a per-vnode
		 * cert or a key.
		 */
		if (sscanf(bp, "VNODEID=%30s", buf)) {
784 785 786 787 788 789 790 791
			for (i = 0; i < strlen(buf); i++){
				if (! (isalnum(buf[i]) ||
				       buf[i] == '_' || buf[i] == '-')) {
					info("tmcd client provided invalid "
					     "characters in vnodeid");
					goto skipit;
				}
			}
792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814
			reqp->isvnode = 1;
			strncpy(reqp->vnodeid, buf, sizeof(reqp->vnodeid));

			if (debug) {
				info("VNODEID %s\n", buf);
			}
			continue;
		}

		/*
		 * An empty token (two delimiters next to each other)
		 * is indicated by a null string. If nothing matched,
		 * and its not an empty token, it must be the actual
		 * command and arguments. Break out.
		 *
		 * Note that rdata will point to any text after the command.
		 *
		 */
		if (*bp) {
			break;
		}
	}

815 816 817 818
	reqp->verbose = verbose;
	reqp->debug = debug;

	tmcd_init(reqp, &myipaddr, NULL);
819 820 821 822

	/*
	 * Map the ip to a nodeid.
	 */
823 824 825 826
	if (havekey) {
		if ((err = iptonodeid(client->sin_addr, reqp, privkey))) {
			error("No such node with wanode_key [%s]\n", privkey);
			goto skipit;
827
		}
828 829
	}
	else {
830
		if ((err = iptonodeid(client->sin_addr, reqp, NULL))) {
831 832 833 834 835 836 837 838 839
			if (reqp->isvnode) {
				error("No such vnode %s associated with %s\n",
				      reqp->vnodeid, inet_ntoa(client->sin_addr));
			}
			else {
				error("No such node: %s\n",
				      inet_ntoa(client->sin_addr));
			}
			goto skipit;
840 841 842 843 844 845 846 847 848 849 850
	}
	/*
	 * Redirect geni sliver nodes to the tmcd of their origin.
	 * FIXME
	 */
	if (reqp->tmcd_redirect[0]) {
		char	buf[BUFSIZ];

		sprintf(buf, "REDIRECT=%s\n", reqp->tmcd_redirect);
		client_writeback(sock, buf, strlen(buf), istcp);
		goto skipit;
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881
	}

	/*
	 * Redirect is allowed from the local host only!
	 * I use this for testing. See below where I test redirect
	 * if the verification fails. 
	 */
	if (!insecure && redirect &&
	    redirect_client.sin_addr.s_addr != myipaddr.s_addr) {
		char	buf1[32], buf2[32];
		
		strcpy(buf1, inet_ntoa(redirect_client.sin_addr));
		strcpy(buf2, inet_ntoa(client->sin_addr));

		if (verbose)
			info("%s INVALID REDIRECT: %s\n", buf1, buf2);
		goto skipit;
	}

	reqp->istcp = istcp;
#ifdef  WITHSSL
	/*
	 * We verify UDP requests below based on the particular request
	 */
	if (!reqp->istcp)
		goto execute;

	reqp->isssl = isssl;
	/*
	 * If the connection is not SSL, then it must be a local node.
	 */
882 883
	if (isssl) {
#if 0
884 885 886 887 888 889
		if (tmcd_sslverify_client(reqp->nodeid, reqp->pclass,
					  reqp->ptype,  reqp->islocal)) {
			error("%s: SSL verification failure\n", reqp->nodeid);
			if (! redirect)
				goto skipit;
		}
890
#endif
891 892 893 894 895 896 897 898 899
		/*
		 * LBS: I took this test out. This client verification has
		 * always been a pain, and offers very little since since
		 * the private key is not encrypted anyway. Besides, we
		 * do not return any sensitive data via tmcd, just a lot of
		 * goo that would not be of interest to anyone. I will
		 * kill this code at some point.
		 */
		if (0 && tmcd_sslverify_client(NULL, NULL,
900 901 902 903 904
					  reqp->ptype,  reqp->islocal)) {
			error("%s: SSL verification failure\n", reqp->nodeid);
			if (! redirect)
				goto skipit;
		}
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
	}
	else if (reqp->iscontrol) {
		error("%s: Control node connection without SSL!\n",
		      reqp->nodeid);
		if (!insecure)
			goto skipit;
	}
#else
	/*
	 * When not compiled for ssl, do not allow remote connections.
	 */
	if (!reqp->islocal) {
		error("%s: Remote node connection not allowed (Define SSL)!\n",
		      reqp->nodeid);
		if (!insecure)
			goto skipit;
	}
	if (reqp->iscontrol) {
		error("%s: Control node connection not allowed "
		      "(Define SSL)!\n", reqp->nodeid);
		if (!insecure)
			goto skipit;
	}
#endif
	/*
	 * Check for a redirect using the default DB. This allows
	 * for a simple redirect to a secondary DB for testing.
	 * Upon return, the dbname has been changed if redirected.
	 */
	if (checkdbredirect(reqp)) {
		/* Something went wrong */
		goto skipit;
	}

	/*
	 * Do private key check. (Non-plab) widearea nodes must report a
	 * private key. It comes over ssl of course. At present we skip
	 * this check for ron nodes. 
943 944 945
	 *
	 * LBS: I took this test out cause its silly. Will kill the code at
	 * some point.
946
	 */
947
	if (0 && !reqp->islocal && !(reqp->isplabdslice || reqp->isplabsvc)) {
948 949 950 951 952 953 954 955
		if (!havekey) {
			error("%s: No privkey sent!\n", reqp->nodeid);
			/*
			 * Skip. Okay, the problem is that the nodes out
			 * there are not reporting the key!
			goto skipit;
			 */
		}
956
		else if (checkprivkey(reqp, client->sin_addr, privkey)) {
957 958 959 960 961 962
			error("%s: privkey mismatch: %s!\n",
			      reqp->nodeid, privkey);
			goto skipit;
		}
	}
execute:
963
	response = tmcd_handle_request(reqp, sock, bp, rdata);
964 965

skipit:
966 967 968 969
	if (response) {
		client_writeback(sock, response->data, response->length, istcp);
		if (!istcp) 
			client_writeback_done(sock,
970
				      redirect ? &redirect_client : client);
971
   	}
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065

#if 0
	if (byteswritten && (command_array[i].flags & F_MINLOG) == 0)
		info("%s: %s wrote %d bytes\n",
		     reqp->nodeid, bp,
		     byteswritten);
#endif


	tmcd_free_response(response);

#if 0
	if (cur_node == NULL) {
		info("%s: INVALID REQUEST\n", reqp->nodeid);
		goto skipit;
	}
#endif


	return 0;
}


/*
 * Lets hear it for global state...Yeah!
 */
static char udpbuf[8192];
static int udpfd = -1, udpix;

/*
 * Write back to client
 */
int
client_writeback(int sock, void *buf, int len, int tcp)
{
	int	cc;
	char	*bufp = (char *) buf;
	
	if (tcp) {
		while (len) {
			if ((cc = WRITE(sock, bufp, len)) <= 0) {
				if (cc < 0) {
					errorc("writing to TCP client");
					return -1;
				}
				error("write to TCP client aborted");
				return -1;
			}
			byteswritten += cc;
			len  -= cc;
			bufp += cc;
		}
	} else {
		if (udpfd != sock) {
			if (udpfd != -1)
				error("UDP reply in progress!?");
			udpfd = sock;
			udpix = 0;
		}
		if (udpix + len > sizeof(udpbuf)) {
			error("client data write truncated");
			len = sizeof(udpbuf) - udpix;
		}
		memcpy(&udpbuf[udpix], bufp, len);
		udpix += len;
	}
	return 0;
}

void
client_writeback_done(int sock, struct sockaddr_in *client)
{
	int err;

	/*
	 * XXX got an error before we wrote anything,
	 * still need to send a reply.
	 */
	if (udpfd == -1)
		udpfd = sock;

	if (sock != udpfd)
		error("UDP reply out of sync!");
	else if (udpix != 0) {
		err = sendto(udpfd, udpbuf, udpix, 0,
			     (struct sockaddr *)client, sizeof(*client));
		if (err < 0)
			errorc("writing to UDP client");
	}
	byteswritten = udpix;
	udpfd = -1;
	udpix = 0;
}