contrib/csup/proto.c

   1 /*-
   2  * Copyright (c) 2003-2006, Maxime Henrion <mux@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/select.h>
  31 #include <sys/socket.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34
  35 #include <assert.h>
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <netdb.h>
  39 #include <pthread.h>
  40 #include <signal.h>
  41 #include <stdarg.h>
  42 #include <stddef.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47
  48 #include "config.h"
  49 #include "detailer.h"
  50 #include "fattr.h"
  51 #include "fixups.h"
  52 #include "globtree.h"
  53 #include "keyword.h"
  54 #include "lister.h"
  55 #include "misc.h"
  56 #include "mux.h"
  57 #include "proto.h"
  58 #include "queue.h"
  59 #include "stream.h"
  60 #include "threads.h"
  61 #include "updater.h"
  62
  63 struct killer {
  64         pthread_t thread;
  65         sigset_t sigset;
  66         struct mux *mux;
  67         int killedby;
  68 };
  69
  70 static void              killer_start(struct killer *, struct mux *);
  71 static void             *killer_run(void *);
  72 static void              killer_stop(struct killer *);
  73
  74 static int               proto_waitconnect(int);
  75 static int               proto_greet(struct config *);
  76 static int               proto_negproto(struct config *);
  77 static int               proto_login(struct config *);
  78 static int               proto_fileattr(struct config *);
  79 static int               proto_xchgcoll(struct config *);
  80 static struct mux       *proto_mux(struct config *);
  81
  82 static int               proto_escape(struct stream *, const char *);
  83 static void              proto_unescape(char *);
  84
  85 static int
  86 proto_waitconnect(int s)
  87 {
  88         fd_set readfd;
  89         socklen_t len;
  90         int error, rv, soerror;
  91
  92         FD_ZERO(&readfd);
  93         FD_SET(s, &readfd);
  94
  95         do {
  96                 rv = select(s + 1, &readfd, NULL, NULL, NULL);
  97         } while (rv == -1 && errno == EINTR);
  98         if (rv == -1)
  99                 return (-1);
 100         /* Check that the connection was really successful. */
 101         len = sizeof(soerror);
 102         error = getsockopt(s, SOL_SOCKET, SO_ERROR, &soerror, &len);
 103         if (error) {
 104                 /* We have no choice but faking an error here. */
 105                 errno = ECONNREFUSED;
 106                 return (-1);
 107         }
 108         if (soerror) {
 109                 errno = soerror;
 110                 return (-1);
 111         }
 112         return (0);
 113 }
 114
 115 /* Connect to the CVSup server. */
 116 int
 117 proto_connect(struct config *config, int family, uint16_t port)
 118 {
 119         char addrbuf[NI_MAXHOST];
 120         /* Enough to hold sizeof("cvsup") or any port number. */
 121         char servname[8];
 122         struct addrinfo *res, *ai, hints;
 123         int error, opt, s;
 124
 125         s = -1;
 126         if (port != 0)
 127                 snprintf(servname, sizeof(servname), "%d", port);
 128         else {
 129                 strncpy(servname, "cvsup", sizeof(servname) - 1);
 130                 servname[sizeof(servname) - 1] = '\0';
 131         }
 132         memset(&hints, 0, sizeof(hints));
 133         hints.ai_family = family;
 134         hints.ai_socktype = SOCK_STREAM;
 135         error = getaddrinfo(config->host, servname, &hints, &res);
 136         /*
 137          * Try with the hardcoded port number for OSes that don't
 138          * have cvsup defined in the /etc/services file.
 139          */
 140         if (error == EAI_SERVICE) {
 141                 strncpy(servname, "5999", sizeof(servname) - 1);
 142                 servname[sizeof(servname) - 1] = '\0';
 143                 error = getaddrinfo(config->host, servname, &hints, &res);
 144         }
 145         if (error) {
 146                 lprintf(0, "Name lookup failure for \"%s\": %s\n", config->host,
 147                     gai_strerror(error));
 148                 return (STATUS_TRANSIENTFAILURE);
 149         }
 150         for (ai = res; ai != NULL; ai = ai->ai_next) {
 151                 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 152                 if (s != -1) {
 153                         error = 0;
 154                         if (config->laddr != NULL) {
 155                                 opt = 1;
 156                                 (void)setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 157                                     &opt, sizeof(opt));
 158                                 error = bind(s, config->laddr,
 159                                     config->laddrlen);
 160                         }
 161                         if (!error) {
 162                                 error = connect(s, ai->ai_addr, ai->ai_addrlen);
 163                                 if (error && errno == EINTR)
 164                                         error = proto_waitconnect(s);
 165                         }
 166                         if (error)
 167                                 close(s);
 168                 }
 169                 (void)getnameinfo(ai->ai_addr, ai->ai_addrlen, addrbuf,
 170                     sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
 171                 if (s == -1 || error) {
 172                         lprintf(0, "Cannot connect to %s: %s\n", addrbuf,
 173                             strerror(errno));
 174                         continue;
 175                 }
 176                 lprintf(1, "Connected to %s\n", addrbuf);
 177                 freeaddrinfo(res);
 178                 config->socket = s;
 179                 return (STATUS_SUCCESS);
 180         }
 181         freeaddrinfo(res);
 182         return (STATUS_TRANSIENTFAILURE);
 183 }
 184
 185 /* Greet the server. */
 186 static int
 187 proto_greet(struct config *config)
 188 {
 189         char *line, *cmd, *msg, *swver;
 190         struct stream *s;
 191
 192         s = config->server;
 193         line = stream_getln(s, NULL);
 194         cmd = proto_get_ascii(&line);
 195         if (cmd == NULL)
 196                 goto bad;
 197         if (strcmp(cmd, "OK") == 0) {
 198                 (void)proto_get_ascii(&line);   /* major number */
 199                 (void)proto_get_ascii(&line);   /* minor number */
 200                 swver = proto_get_ascii(&line);
 201         } else if (strcmp(cmd, "!") == 0) {
 202                 msg = proto_get_rest(&line);
 203                 if (msg == NULL)
 204                         goto bad;
 205                 lprintf(-1, "Rejected by server: %s\n", msg);
 206                 return (STATUS_TRANSIENTFAILURE);
 207         } else
 208                 goto bad;
 209         lprintf(2, "Server software version: %s\n",
 210             swver != NULL ? swver : ".");
 211         return (STATUS_SUCCESS);
 212 bad:
 213         lprintf(-1, "Invalid greeting from server\n");
 214         return (STATUS_FAILURE);
 215 }
 216
 217 /* Negotiate protocol version with the server. */
 218 static int
 219 proto_negproto(struct config *config)
 220 {
 221         struct stream *s;
 222         char *cmd, *line, *msg;
 223         int error, maj, min;
 224
 225         s = config->server;
 226         proto_printf(s, "PROTO %d %d %s\n", PROTO_MAJ, PROTO_MIN, PROTO_SWVER);
 227         stream_flush(s);
 228         line = stream_getln(s, NULL);
 229         cmd = proto_get_ascii(&line);
 230         if (cmd == NULL || line == NULL)
 231                 goto bad;
 232         if (strcmp(cmd, "!") == 0) {
 233                 msg = proto_get_rest(&line);
 234                 lprintf(-1, "Protocol negotiation failed: %s\n", msg);
 235                 return (1);
 236         } else if (strcmp(cmd, "PROTO") != 0)
 237                 goto bad;
 238         error = proto_get_int(&line, &maj, 10);
 239         if (!error)
 240                 error = proto_get_int(&line, &min, 10);
 241         if (error)
 242                 goto bad;
 243         if (maj != PROTO_MAJ || min != PROTO_MIN) {
 244                 lprintf(-1, "Server protocol version %d.%d not supported "
 245                     "by client\n", maj, min);
 246                 return (STATUS_FAILURE);
 247         }
 248         return (STATUS_SUCCESS);
 249 bad:
 250         lprintf(-1, "Invalid PROTO command from server\n");
 251         return (STATUS_FAILURE);
 252 }
 253
 254 static int
 255 proto_login(struct config *config)
 256 {
 257         struct stream *s;
 258         char hostbuf[MAXHOSTNAMELEN];
 259         char *line, *login, *host, *cmd, *realm, *challenge, *msg;
 260         int error;
 261
 262         s = config->server;
 263         error = gethostname(hostbuf, sizeof(hostbuf));
 264         hostbuf[sizeof(hostbuf) - 1] = '\0';
 265         if (error)
 266                 host = NULL;
 267         else
 268                 host = hostbuf;
 269         login = getlogin();
 270         proto_printf(s, "USER %s %s\n", login != NULL ? login : "?",
 271             host != NULL ? host : "?");
 272         stream_flush(s);
 273         line = stream_getln(s, NULL);
 274         cmd = proto_get_ascii(&line);
 275         realm = proto_get_ascii(&line);
 276         challenge = proto_get_ascii(&line);
 277         if (challenge == NULL || line != NULL)
 278                 goto bad;
 279         if (strcmp(realm, ".") != 0 || strcmp(challenge, ".") != 0) {
 280                 lprintf(-1, "Authentication required by the server and not "
 281                     "supported by client\n");
 282                 return (STATUS_FAILURE);
 283         }
 284         proto_printf(s, "AUTHMD5 . . .\n");
 285         stream_flush(s);
 286         line = stream_getln(s, NULL);
 287         cmd = proto_get_ascii(&line);
 288         if (cmd == NULL || line == NULL)
 289                 goto bad;
 290         if (strcmp(cmd, "OK") == 0)
 291                 return (STATUS_SUCCESS);
 292         if (strcmp(cmd, "!") == 0) {
 293                 msg = proto_get_rest(&line);
 294                 if (msg == NULL)
 295                         goto bad;
 296                 lprintf(-1, "Server error: %s\n", msg);
 297                 return (STATUS_FAILURE);
 298         }
 299 bad:
 300         lprintf(-1, "Invalid server reply to AUTHMD5\n");
 301         return (STATUS_FAILURE);
 302 }
 303
 304 /*
 305  * File attribute support negotiation.
 306  */
 307 static int
 308 proto_fileattr(struct config *config)
 309 {
 310         fattr_support_t support;
 311         struct stream *s;
 312         char *line, *cmd;
 313         int error, i, n, attr;
 314
 315         s = config->server;
 316         lprintf(2, "Negotiating file attribute support\n");
 317         proto_printf(s, "ATTR %d\n", FT_NUMBER);
 318         for (i = 0; i < FT_NUMBER; i++)
 319                 proto_printf(s, "%x\n", fattr_supported(i));
 320         proto_printf(s, ".\n");
 321         stream_flush(s);
 322         line = stream_getln(s, NULL);
 323         if (line == NULL)
 324                 goto bad;
 325         cmd = proto_get_ascii(&line);
 326         error = proto_get_int(&line, &n, 10);
 327         if (error || line != NULL || strcmp(cmd, "ATTR") != 0 || n > FT_NUMBER)
 328                 goto bad;
 329         for (i = 0; i < n; i++) {
 330                 line = stream_getln(s, NULL);
 331                 if (line == NULL)
 332                         goto bad;
 333                 error = proto_get_int(&line, &attr, 16);
 334                 if (error)
 335                         goto bad;
 336                 support[i] = fattr_supported(i) & attr;
 337         }
 338         for (i = n; i < FT_NUMBER; i++)
 339                 support[i] = 0;
 340         line = stream_getln(s, NULL);
 341         if (line == NULL || strcmp(line, ".") != 0)
 342                 goto bad;
 343         memcpy(config->fasupport, support, sizeof(config->fasupport));
 344         return (STATUS_SUCCESS);
 345 bad:
 346         lprintf(-1, "Protocol error negotiating attribute support\n");
 347         return (STATUS_FAILURE);
 348 }
 349
 350 /*
 351  * Exchange collection information.
 352  */
 353 static int
 354 proto_xchgcoll(struct config *config)
 355 {
 356         struct coll *coll;
 357         struct stream *s;
 358         struct globtree *diraccept, *dirrefuse;
 359         struct globtree *fileaccept, *filerefuse;
 360         char *line, *cmd, *collname, *pat;
 361         char *msg, *release, *ident, *rcskey, *prefix;
 362         size_t i, len;
 363         int error, flags, options;
 364
 365         s = config->server;
 366         lprintf(2, "Exchanging collection information\n");
 367         STAILQ_FOREACH(coll, &config->colls, co_next) {
 368                 proto_printf(s, "COLL %s %s %o %d\n", coll->co_name,
 369                     coll->co_release, coll->co_umask, coll->co_options);
 370                 for (i = 0; i < pattlist_size(coll->co_accepts); i++) {
 371                     proto_printf(s, "ACC %s\n",
 372                         pattlist_get(coll->co_accepts, i));
 373                 }
 374                 for (i = 0; i < pattlist_size(coll->co_refusals); i++) {
 375                     proto_printf(s, "REF %s\n",
 376                         pattlist_get(coll->co_refusals, i));
 377                 }
 378                 proto_printf(s, ".\n");
 379         }
 380         proto_printf(s, ".\n");
 381         stream_flush(s);
 382
 383         STAILQ_FOREACH(coll, &config->colls, co_next) {
 384                 if (coll->co_options & CO_SKIP)
 385                         continue;
 386                 coll->co_norsync = globtree_false();
 387                 line = stream_getln(s, NULL);
 388                 if (line == NULL)
 389                         goto bad;
 390                 cmd = proto_get_ascii(&line);
 391                 collname = proto_get_ascii(&line);
 392                 release = proto_get_ascii(&line);
 393                 error = proto_get_int(&line, &options, 10);
 394                 if (error || line != NULL)
 395                         goto bad;
 396                 if (strcmp(cmd, "COLL") != 0 ||
 397                     strcmp(collname, coll->co_name) != 0 ||
 398                     strcmp(release, coll->co_release) != 0)
 399                         goto bad;
 400                 coll->co_options =
 401                     (coll->co_options | (options & CO_SERVMAYSET)) &
 402                     ~(~options & CO_SERVMAYCLEAR);
 403                 while ((line = stream_getln(s, NULL)) != NULL) {
 404                         if (strcmp(line, ".") == 0)
 405                                 break;
 406                         cmd = proto_get_ascii(&line);
 407                         if (cmd == NULL)
 408                                 goto bad;
 409                         if (strcmp(cmd, "!") == 0) {
 410                                 msg = proto_get_rest(&line);
 411                                 if (msg == NULL)
 412                                         goto bad;
 413                                 lprintf(-1, "Server message: %s\n", msg);
 414                         } else if (strcmp(cmd, "PRFX") == 0) {
 415                                 prefix = proto_get_ascii(&line);
 416                                 if (prefix == NULL || line != NULL)
 417                                         goto bad;
 418                                 coll->co_cvsroot = xstrdup(prefix);
 419                         } else if (strcmp(cmd, "KEYALIAS") == 0) {
 420                                 ident = proto_get_ascii(&line);
 421                                 rcskey = proto_get_ascii(&line);
 422                                 if (rcskey == NULL || line != NULL)
 423                                         goto bad;
 424                                 error = keyword_alias(coll->co_keyword, ident,
 425                                     rcskey);
 426                                 if (error)
 427                                         goto bad;
 428                         } else if (strcmp(cmd, "KEYON") == 0) {
 429                                 ident = proto_get_ascii(&line);
 430                                 if (ident == NULL || line != NULL)
 431                                         goto bad;
 432                                 error = keyword_enable(coll->co_keyword, ident);
 433                                 if (error)
 434                                         goto bad;
 435                         } else if (strcmp(cmd, "KEYOFF") == 0) {
 436                                 ident = proto_get_ascii(&line);
 437                                 if (ident == NULL || line != NULL)
 438                                         goto bad;
 439                                 error = keyword_disable(coll->co_keyword,
 440                                     ident);
 441                                 if (error)
 442                                         goto bad;
 443                         } else if (strcmp(cmd, "NORS") == 0) {
 444                                 pat = proto_get_ascii(&line);
 445                                 if (pat == NULL || line != NULL)
 446                                         goto bad;
 447                                 coll->co_norsync = globtree_or(coll->co_norsync,
 448                                     globtree_match(pat, FNM_PATHNAME));
 449                         } else if (strcmp(cmd, "RNORS") == 0) {
 450                                 pat = proto_get_ascii(&line);
 451                                 if (pat == NULL || line != NULL)
 452                                         goto bad;
 453                                 coll->co_norsync = globtree_or(coll->co_norsync,
 454                                     globtree_match(pat, FNM_PATHNAME |
 455                                     FNM_LEADING_DIR));
 456                         } else
 457                                 goto bad;
 458                 }
 459                 if (line == NULL)
 460                         goto bad;
 461                 keyword_prepare(coll->co_keyword);
 462
 463                 diraccept = globtree_true();
 464                 fileaccept = globtree_true();
 465                 dirrefuse = globtree_false();
 466                 filerefuse = globtree_false();
 467
 468                 if (pattlist_size(coll->co_accepts) > 0) {
 469                         globtree_free(diraccept);
 470                         globtree_free(fileaccept);
 471                         diraccept = globtree_false();
 472                         fileaccept = globtree_false();
 473                         flags = FNM_PATHNAME | FNM_LEADING_DIR |
 474                             FNM_PREFIX_DIRS;
 475                         for (i = 0; i < pattlist_size(coll->co_accepts); i++) {
 476                                 pat = pattlist_get(coll->co_accepts, i);
 477                                 diraccept = globtree_or(diraccept,
 478                                     globtree_match(pat, flags));
 479
 480                                 len = strlen(pat);
 481                                 if (coll->co_options & CO_CHECKOUTMODE &&
 482                                     (len == 0 || pat[len - 1] != '*')) {
 483                                         /* We must modify the pattern so that it
 484                                            refers to the RCS file, rather than
 485                                            the checked-out file. */
 486                                         xasprintf(&pat, "%s,v", pat);
 487                                         fileaccept = globtree_or(fileaccept,
 488                                             globtree_match(pat, flags));
 489                                         free(pat);
 490                                 } else {
 491                                         fileaccept = globtree_or(fileaccept,
 492                                             globtree_match(pat, flags));
 493                                 }
 494                         }
 495                 }
 496
 497                 for (i = 0; i < pattlist_size(coll->co_refusals); i++) {
 498                         pat = pattlist_get(coll->co_refusals, i);
 499                         dirrefuse = globtree_or(dirrefuse,
 500                             globtree_match(pat, 0));
 501                         len = strlen(pat);
 502                         if (coll->co_options & CO_CHECKOUTMODE &&
 503                             (len == 0 || pat[len - 1] != '*')) {
 504                                 /* We must modify the pattern so that it refers
 505                                    to the RCS file, rather than the checked-out
 506                                    file. */
 507                                 xasprintf(&pat, "%s,v", pat);
 508                                 filerefuse = globtree_or(filerefuse,
 509                                     globtree_match(pat, 0));
 510                                 free(pat);
 511                         } else {
 512                                 filerefuse = globtree_or(filerefuse,
 513                                     globtree_match(pat, 0));
 514                         }
 515                 }
 516
 517                 coll->co_dirfilter = globtree_and(diraccept,
 518                     globtree_not(dirrefuse));
 519                 coll->co_filefilter = globtree_and(fileaccept,
 520                     globtree_not(filerefuse));
 521
 522                 /* At this point we don't need the pattern lists anymore. */
 523                 pattlist_free(coll->co_accepts);
 524                 pattlist_free(coll->co_refusals);
 525                 coll->co_accepts = NULL;
 526                 coll->co_refusals = NULL;
 527
 528                 /* Set up a mask of file attributes that we don't want to sync
 529                    with the server. */
 530                 if (!(coll->co_options & CO_SETOWNER))
 531                         coll->co_attrignore |= FA_OWNER | FA_GROUP;
 532                 if (!(coll->co_options & CO_SETMODE))
 533                         coll->co_attrignore |= FA_MODE;
 534                 if (!(coll->co_options & CO_SETFLAGS))
 535                         coll->co_attrignore |= FA_FLAGS;
 536         }
 537         return (STATUS_SUCCESS);
 538 bad:
 539         lprintf(-1, "Protocol error during collection exchange\n");
 540         return (STATUS_FAILURE);
 541 }
 542
 543 static struct mux *
 544 proto_mux(struct config *config)
 545 {
 546         struct mux *m;
 547         struct stream *s, *wr;
 548         struct chan *chan0, *chan1;
 549         int id;
 550
 551         s = config->server;
 552         lprintf(2, "Establishing multiplexed-mode data connection\n");
 553         proto_printf(s, "MUX\n");
 554         stream_flush(s);
 555         m = mux_open(config->socket, &chan0);
 556         if (m == NULL) {
 557                 lprintf(-1, "Cannot open the multiplexer\n");
 558                 return (NULL);
 559         }
 560         id = chan_listen(m);
 561         if (id == -1) {
 562                 lprintf(-1, "ChannelMux.Listen failed: %s\n", strerror(errno));
 563                 mux_close(m);
 564                 return (NULL);
 565         }
 566         wr = stream_open(chan0, NULL, (stream_writefn_t *)chan_write, NULL);
 567         proto_printf(wr, "CHAN %d\n", id);
 568         stream_close(wr);
 569         chan1 = chan_accept(m, id);
 570         if (chan1 == NULL) {
 571                 lprintf(-1, "ChannelMux.Accept failed: %s\n", strerror(errno));
 572                 mux_close(m);
 573                 return (NULL);
 574         }
 575         config->chan0 = chan0;
 576         config->chan1 = chan1;
 577         return (m);
 578 }
 579
 580 /*
 581  * Initializes the connection to the CVSup server, that is handle
 582  * the protocol negotiation, logging in, exchanging file attributes
 583  * support and collections information, and finally run the update
 584  * session.
 585  */
 586 int
 587 proto_run(struct config *config)
 588 {
 589         struct thread_args lister_args;
 590         struct thread_args detailer_args;
 591         struct thread_args updater_args;
 592         struct thread_args *args;
 593         struct killer killer;
 594         struct threads *workers;
 595         struct mux *m;
 596         int i, status;
 597
 598         /*
 599          * We pass NULL for the close() function because we'll reuse
 600          * the socket after the stream is closed.
 601          */
 602         config->server = stream_open_fd(config->socket, stream_read_fd,
 603             stream_write_fd, NULL);
 604         status = proto_greet(config);
 605         if (status == STATUS_SUCCESS)
 606                 status = proto_negproto(config);
 607         if (status == STATUS_SUCCESS)
 608                 status = proto_login(config);
 609         if (status == STATUS_SUCCESS)
 610                 status = proto_fileattr(config);
 611         if (status == STATUS_SUCCESS)
 612                 status = proto_xchgcoll(config);
 613         if (status != STATUS_SUCCESS)
 614                 return (status);
 615
 616         /* Multi-threaded action starts here. */
 617         m = proto_mux(config);
 618         if (m == NULL)
 619                 return (STATUS_FAILURE);
 620
 621         stream_close(config->server);
 622         config->server = NULL;
 623         config->fixups = fixups_new();
 624         killer_start(&killer, m);
 625
 626         /* Start the worker threads. */
 627         workers = threads_new();
 628         args = &lister_args;
 629         args->config = config;
 630         args->status = -1;
 631         args->errmsg = NULL;
 632         args->rd = NULL;
 633         args->wr = stream_open(config->chan0,
 634             NULL, (stream_writefn_t *)chan_write, NULL);
 635         threads_create(workers, lister, args);
 636
 637         args = &detailer_args;
 638         args->config = config;
 639         args->status = -1;
 640         args->errmsg = NULL;
 641         args->rd = stream_open(config->chan0,
 642             (stream_readfn_t *)chan_read, NULL, NULL);
 643         args->wr = stream_open(config->chan1,
 644             NULL, (stream_writefn_t *)chan_write, NULL);
 645         threads_create(workers, detailer, args);
 646
 647         args = &updater_args;
 648         args->config = config;
 649         args->status = -1;
 650         args->errmsg = NULL;
 651         args->rd = stream_open(config->chan1,
 652             (stream_readfn_t *)chan_read, NULL, NULL);
 653         args->wr = NULL;
 654         threads_create(workers, updater, args);
 655
 656         lprintf(2, "Running\n");
 657         /* Wait for all the worker threads to finish. */
 658         status = STATUS_SUCCESS;
 659         for (i = 0; i < 3; i++) {
 660                 args = threads_wait(workers);
 661                 if (args->rd != NULL)
 662                         stream_close(args->rd);
 663                 if (args->wr != NULL)
 664                         stream_close(args->wr);
 665                 if (args->status != STATUS_SUCCESS) {
 666                         assert(args->errmsg != NULL);
 667                         if (status == STATUS_SUCCESS) {
 668                                 status = args->status;
 669                                 /* Shutdown the multiplexer to wake up all
 670                                    the other threads. */
 671                                 mux_shutdown(m, args->errmsg, status);
 672                         }
 673                         free(args->errmsg);
 674                 }
 675         }
 676         threads_free(workers);
 677         if (status == STATUS_SUCCESS) {
 678                 lprintf(2, "Shutting down connection to server\n");
 679                 chan_close(config->chan0);
 680                 chan_close(config->chan1);
 681                 chan_wait(config->chan0);
 682                 chan_wait(config->chan1);
 683                 mux_shutdown(m, NULL, STATUS_SUCCESS);
 684         }
 685         killer_stop(&killer);
 686         fixups_free(config->fixups);
 687         status = mux_close(m);
 688         if (status == STATUS_SUCCESS) {
 689                 lprintf(1, "Finished successfully\n");
 690         } else if (status == STATUS_INTERRUPTED) {
 691                 lprintf(-1, "Interrupted\n");
 692                 if (killer.killedby != -1)
 693                         kill(getpid(), killer.killedby);
 694         }
 695         return (status);
 696 }
 697
 698 /*
 699  * Write a string into the stream, escaping characters as needed.
 700  * Characters escaped:
 701  *
 702  * SPACE        -> "\_"
 703  * TAB          ->  "\t"
 704  * NEWLINE      -> "\n"
 705  * CR           -> "\r"
 706  * \            -> "\\"
 707  */
 708 static int
 709 proto_escape(struct stream *wr, const char *s)
 710 {
 711         size_t len;
 712         ssize_t n;
 713         char c;
 714
 715         /* Handle characters that need escaping. */
 716         do {
 717                 len = strcspn(s, " \t\r\n\\");
 718                 n = stream_write(wr, s, len);
 719                 if (n == -1)
 720                         return (-1);
 721                 c = s[len];
 722                 switch (c) {
 723                 case ' ':
 724                         n = stream_write(wr, "\\_", 2);
 725                         break;
 726                 case '\t':
 727                         n = stream_write(wr, "\\t", 2);
 728                         break;
 729                 case '\r':
 730                         n = stream_write(wr, "\\r", 2);
 731                         break;
 732                 case '\n':
 733                         n = stream_write(wr, "\\n", 2);
 734                         break;
 735                 case '\\':
 736                         n = stream_write(wr, "\\\\", 2);
 737                         break;
 738                 }
 739                 if (n == -1)
 740                         return (-1);
 741                 s += len + 1;
 742         } while (c != '\0');
 743         return (0);
 744 }
 745
 746 /*
 747  * A simple printf() implementation specifically tailored for csup.
 748  * List of the supported formats:
 749  *
 750  * %c           Print a char.
 751  * %d or %i     Print an int as decimal.
 752  * %x           Print an int as hexadecimal.
 753  * %o           Print an int as octal.
 754  * %t           Print a time_t as decimal.
 755  * %s           Print a char * escaping some characters as needed.
 756  * %S           Print a char * without escaping.
 757  * %f           Print an encoded struct fattr *.
 758  * %F           Print an encoded struct fattr *, specifying the supported
 759  *              attributes.
 760  */
 761 int
 762 proto_printf(struct stream *wr, const char *format, ...)
 763 {
 764         fattr_support_t *support;
 765         long long longval;
 766         struct fattr *fa;
 767         const char *fmt;
 768         va_list ap;
 769         char *cp, *s, *attr;
 770         ssize_t n;
 771         int rv, val, ignore;
 772         char c;
 773
 774         n = 0;
 775         rv = 0;
 776         fmt = format;
 777         va_start(ap, format);
 778         while ((cp = strchr(fmt, '%')) != NULL) {
 779                 if (cp > fmt) {
 780                         n = stream_write(wr, fmt, cp - fmt);
 781                         if (n == -1)
 782                                 return (-1);
 783                 }
 784                 if (*++cp == '\0')
 785                         goto done;
 786                 switch (*cp) {
 787                 case 'c':
 788                         c = va_arg(ap, int);
 789                         rv = stream_printf(wr, "%c", c);
 790                         break;
 791                 case 'd':
 792                 case 'i':
 793                         val = va_arg(ap, int);
 794                         rv = stream_printf(wr, "%d", val);
 795                         break;
 796                 case 'x':
 797                         val = va_arg(ap, int);
 798                         rv = stream_printf(wr, "%x", val);
 799                         break;
 800                 case 'o':
 801                         val = va_arg(ap, int);
 802                         rv = stream_printf(wr, "%o", val);
 803                         break;
 804                 case 'S':
 805                         s = va_arg(ap, char *);
 806                         assert(s != NULL);
 807                         rv = stream_printf(wr, "%s", s);
 808                         break;
 809                 case 's':
 810                         s = va_arg(ap, char *);
 811                         assert(s != NULL);
 812                         rv = proto_escape(wr, s);
 813                         break;
 814                 case 't':
 815                         longval = (long long)va_arg(ap, time_t);
 816                         rv = stream_printf(wr, "%lld", longval);
 817                         break;
 818                 case 'f':
 819                         fa = va_arg(ap, struct fattr *);
 820                         attr = fattr_encode(fa, NULL, 0);
 821                         rv = proto_escape(wr, attr);
 822                         free(attr);
 823                         break;
 824                 case 'F':
 825                         fa = va_arg(ap, struct fattr *);
 826                         support = va_arg(ap, fattr_support_t *);
 827                         ignore = va_arg(ap, int);
 828                         attr = fattr_encode(fa, *support, ignore);
 829                         rv = proto_escape(wr, attr);
 830                         free(attr);
 831                         break;
 832                 case '%':
 833                         n = stream_write(wr, "%", 1);
 834                         if (n == -1)
 835                                 return (-1);
 836                         break;
 837                 }
 838                 if (rv == -1)
 839                         return (-1);
 840                 fmt = cp + 1;
 841         }
 842         if (*fmt != '\0') {
 843                 rv = stream_printf(wr, "%s", fmt);
 844                 if (rv == -1)
 845                         return (-1);
 846         }
 847 done:
 848         va_end(ap);
 849         return (0);
 850 }
 851
 852 /*
 853  * Unescape the string, see proto_escape().
 854  */
 855 static void
 856 proto_unescape(char *s)
 857 {
 858         char *cp, *cp2;
 859
 860         cp = s;
 861         while ((cp = strchr(cp, '\\')) != NULL) {
 862                 switch (cp[1]) {
 863                 case '_':
 864                         *cp = ' ';
 865                         break;
 866                 case 't':
 867                         *cp = '\t';
 868                         break;
 869                 case 'r':
 870                         *cp = '\r';
 871                         break;
 872                 case 'n':
 873                         *cp = '\n';
 874                         break;
 875                 case '\\':
 876                         *cp = '\\';
 877                         break;
 878                 default:
 879                         *cp = *(cp + 1);
 880                 }
 881                 cp2 = ++cp;
 882                 while (*cp2 != '\0') {
 883                         *cp2 = *(cp2 + 1);
 884                         cp2++;
 885                 }
 886         }
 887 }
 888
 889 /*
 890  * Get an ascii token in the string.
 891  */
 892 char *
 893 proto_get_ascii(char **s)
 894 {
 895         char *ret;
 896
 897         ret = strsep(s, " ");
 898         if (ret == NULL)
 899                 return (NULL);
 900         /* Make sure we disallow 0-length fields. */
 901         if (*ret == '\0') {
 902                 *s = NULL;
 903                 return (NULL);
 904         }
 905         proto_unescape(ret);
 906         return (ret);
 907 }
 908
 909 /*
 910  * Get the rest of the string.
 911  */
 912 char *
 913 proto_get_rest(char **s)
 914 {
 915         char *ret;
 916
 917         if (s == NULL)
 918                 return (NULL);
 919         ret = *s;
 920         proto_unescape(ret);
 921         *s = NULL;
 922         return (ret);
 923 }
 924
 925 /*
 926  * Get an int token.
 927  */
 928 int
 929 proto_get_int(char **s, int *val, int base)
 930 {
 931         char *cp;
 932         int error;
 933
 934         cp = proto_get_ascii(s);
 935         if (cp == NULL)
 936                 return (-1);
 937         error = asciitoint(cp, val, base);
 938         return (error);
 939 }
 940
 941 /*
 942  * Get a time_t token.
 943  *
 944  * Ideally, we would use an intmax_t and strtoimax() here, but strtoll()
 945  * is more portable and 64bits should be enough for a timestamp.
 946  */
 947 int
 948 proto_get_time(char **s, time_t *val)
 949 {
 950         long long tmp;
 951         char *cp, *end;
 952
 953         cp = proto_get_ascii(s);
 954         if (cp == NULL)
 955                 return (-1);
 956         errno = 0;
 957         tmp = strtoll(cp, &end, 10);
 958         if (errno || *end != '\0')
 959                 return (-1);
 960         *val = (time_t)tmp;
 961         return (0);
 962 }
 963
 964 /* Start the killer thread.  It is used to protect against some signals
 965    during the multi-threaded run so that we can gracefully fail.  */
 966 static void
 967 killer_start(struct killer *k, struct mux *m)
 968 {
 969         int error;
 970
 971         k->mux = m;
 972         k->killedby = -1;
 973         sigemptyset(&k->sigset);
 974         sigaddset(&k->sigset, SIGINT);
 975         sigaddset(&k->sigset, SIGHUP);
 976         sigaddset(&k->sigset, SIGTERM);
 977         sigaddset(&k->sigset, SIGPIPE);
 978         pthread_sigmask(SIG_BLOCK, &k->sigset, NULL);
 979         error = pthread_create(&k->thread, NULL, killer_run, k);
 980         if (error)
 981                 err(1, "pthread_create");
 982 }
 983
 984 /* The main loop of the killer thread. */
 985 static void *
 986 killer_run(void *arg)
 987 {
 988         struct killer *k;
 989         int error, sig, old;
 990
 991         k = arg;
 992 again:
 993         error = sigwait(&k->sigset, &sig);
 994         assert(!error);
 995         if (sig == SIGINT || sig == SIGHUP || sig == SIGTERM) {
 996                 if (k->killedby == -1) {
 997                         k->killedby = sig;
 998                         /* Ensure we don't get canceled during the shutdown. */
 999                         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old);
1000                         mux_shutdown(k->mux, "Cleaning up ...",
1001                             STATUS_INTERRUPTED);
1002                         pthread_setcancelstate(old, NULL);
1003                 }
1004         }
1005         goto again;
1006 }
1007
1008 /* Stop the killer thread. */
1009 static void
1010 killer_stop(struct killer *k)
1011 {
1012         void *val;
1013         int error;
1014
1015         error = pthread_cancel(k->thread);
1016         assert(!error);
1017         pthread_join(k->thread, &val);
1018         assert(val == PTHREAD_CANCELED);
1019         pthread_sigmask(SIG_UNBLOCK, &k->sigset, NULL);
1020 }