| File: | src/usr.bin/rdist/common.c |
| Warning: | line 623, column 8 Although the value stored to 'len' is used in the enclosing expression, the value is never actually read from 'len' |
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| 1 | /* $OpenBSD: common.c,v 1.40 2019/06/28 13:35:03 deraadt Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1983 Regents of the University of California. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the University nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/stat.h> |
| 33 | #include <sys/time.h> |
| 34 | #include <sys/wait.h> |
| 35 | |
| 36 | #include <errno(*__errno()).h> |
| 37 | #include <fcntl.h> |
| 38 | #include <grp.h> |
| 39 | #include <limits.h> |
| 40 | #include <paths.h> |
| 41 | #include <stdarg.h> |
| 42 | #include <stdio.h> |
| 43 | #include <stdlib.h> |
| 44 | #include <string.h> |
| 45 | #include <unistd.h> |
| 46 | |
| 47 | #include "defs.h" |
| 48 | |
| 49 | /* |
| 50 | * Things common to both the client and server. |
| 51 | */ |
| 52 | |
| 53 | /* |
| 54 | * Variables common to both client and server |
| 55 | */ |
| 56 | char host[HOST_NAME_MAX255+1]; /* Name of this host */ |
| 57 | uid_t userid = (uid_t)-1; /* User's UID */ |
| 58 | gid_t groupid = (gid_t)-1; /* User's GID */ |
| 59 | gid_t gidset[NGROUPS_MAX16]; /* User's GID list */ |
| 60 | int gidsetlen = 0; /* Number of GIDS in list */ |
| 61 | char *homedir = NULL((void *)0); /* User's $HOME */ |
| 62 | char *locuser = NULL((void *)0); /* Local User's name */ |
| 63 | int isserver = FALSE0; /* We're the server */ |
| 64 | int amchild = 0; /* This PID is a child */ |
| 65 | int do_fork = 1; /* Fork child process */ |
| 66 | char *currenthost = NULL((void *)0); /* Current client hostname */ |
| 67 | char *progname = NULL((void *)0); /* Name of this program */ |
| 68 | int rem_r = -1; /* Client file descriptor */ |
| 69 | int rem_w = -1; /* Client file descriptor */ |
| 70 | volatile sig_atomic_t contimedout = FALSE0; /* Connection timed out */ |
| 71 | int rtimeout = RTIMEOUT900; /* Response time out */ |
| 72 | jmp_buf finish_jmpbuf; /* Finish() jmp buffer */ |
| 73 | int setjmp_ok = FALSE0; /* setjmp()/longjmp() status */ |
| 74 | char **realargv; /* Real main() argv */ |
| 75 | int realargc; /* Real main() argc */ |
| 76 | opt_t options = 0; /* Global install options */ |
| 77 | char defowner[64] = "bin"; /* Default owner */ |
| 78 | char defgroup[64] = "bin"; /* Default group */ |
| 79 | |
| 80 | static int sendcmdmsg(int, char *, size_t); |
| 81 | static ssize_t remread(int, u_char *, size_t); |
| 82 | static int remmore(void); |
| 83 | |
| 84 | /* |
| 85 | * Front end to write() that handles partial write() requests. |
| 86 | */ |
| 87 | ssize_t |
| 88 | xwrite(int fd, void *buf, size_t len) |
| 89 | { |
| 90 | size_t nleft = len; |
| 91 | ssize_t nwritten; |
| 92 | char *ptr = buf; |
| 93 | |
| 94 | while (nleft > 0) { |
| 95 | if ((nwritten = write(fd, ptr, nleft)) <= 0) { |
| 96 | return nwritten; |
| 97 | } |
| 98 | nleft -= nwritten; |
| 99 | ptr += nwritten; |
| 100 | } |
| 101 | |
| 102 | return len; |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * Do run-time initialization |
| 107 | */ |
| 108 | int |
| 109 | init(int argc, char **argv, char **envp) |
| 110 | { |
| 111 | struct passwd *pw; |
| 112 | int i; |
| 113 | |
| 114 | /* |
| 115 | * Save a copy of our argc and argv before setargs() overwrites them |
| 116 | */ |
| 117 | realargc = argc; |
| 118 | realargv = xmalloc(sizeof(char *) * (argc+1)); |
| 119 | for (i = 0; i < argc; i++) |
| 120 | realargv[i] = xstrdup(argv[i]); |
| 121 | |
| 122 | pw = getpwuid(userid = getuid()); |
| 123 | if (pw == NULL((void *)0)) { |
| 124 | error("Your user id (%u) is not known to this system.", |
| 125 | getuid()); |
| 126 | return(-1); |
| 127 | } |
| 128 | |
| 129 | debugmsg(DM_MISC0x10, "UserID = %u pwname = '%s' home = '%s'\n", |
| 130 | userid, pw->pw_name, pw->pw_dir); |
| 131 | homedir = xstrdup(pw->pw_dir); |
| 132 | locuser = xstrdup(pw->pw_name); |
| 133 | groupid = pw->pw_gid; |
| 134 | gidsetlen = getgroups(NGROUPS_MAX16, gidset); |
| 135 | gethostname(host, sizeof(host)); |
| 136 | #if 0 |
| 137 | if ((cp = strchr(host, '.')) != NULL((void *)0)) |
| 138 | *cp = CNULL'\0'; |
| 139 | #endif |
| 140 | |
| 141 | /* |
| 142 | * If we're not root, disable paranoid ownership checks |
| 143 | * since normal users cannot chown() files. |
| 144 | */ |
| 145 | if (!isserver && userid != 0) { |
| 146 | FLAG_ON(options, DO_NOCHKOWNER)options |= 0x0004000; |
| 147 | FLAG_ON(options, DO_NOCHKGROUP)options |= 0x0010000; |
| 148 | } |
| 149 | |
| 150 | return(0); |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * Finish things up before ending. |
| 155 | */ |
| 156 | void |
| 157 | finish(void) |
| 158 | { |
| 159 | debugmsg(DM_CALL0x01, |
| 160 | "finish() called: do_fork = %d amchild = %d isserver = %d", |
| 161 | do_fork, amchild, isserver); |
| 162 | cleanup(0); |
| 163 | |
| 164 | /* |
| 165 | * There's no valid finish_jmpbuf for the rdist master parent. |
| 166 | */ |
| 167 | if (!do_fork || amchild || isserver) { |
| 168 | |
| 169 | if (!setjmp_ok) { |
| 170 | #ifdef DEBUG_SETJMP |
| 171 | error("attemping longjmp() without target"); |
| 172 | abort(); |
| 173 | #else |
| 174 | exit(1); |
| 175 | #endif |
| 176 | } |
| 177 | |
| 178 | longjmp(finish_jmpbuf, 1); |
| 179 | /*NOTREACHED*/ |
| 180 | error("Unexpected failure of longjmp() in finish()"); |
| 181 | exit(2); |
| 182 | } else |
| 183 | exit(1); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Handle lost connections |
| 188 | */ |
| 189 | void |
| 190 | lostconn(void) |
| 191 | { |
| 192 | /* Prevent looping */ |
| 193 | (void) signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 194 | |
| 195 | rem_r = rem_w = -1; /* Ensure we don't try to send to server */ |
| 196 | checkhostname(); |
| 197 | error("Lost connection to %s", |
| 198 | (currenthost) ? currenthost : "(unknown)"); |
| 199 | |
| 200 | finish(); |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * General signal handler |
| 205 | */ |
| 206 | void |
| 207 | sighandler(int sig) |
| 208 | { |
| 209 | int save_errno = errno(*__errno()); |
| 210 | |
| 211 | /* XXX signal race */ |
| 212 | debugmsg(DM_CALL0x01, "sighandler() received signal %d\n", sig); |
| 213 | |
| 214 | switch (sig) { |
| 215 | case SIGALRM14: |
| 216 | contimedout = TRUE1; |
| 217 | /* XXX signal race */ |
| 218 | checkhostname(); |
| 219 | error("Response time out"); |
| 220 | finish(); |
| 221 | break; |
| 222 | |
| 223 | case SIGPIPE13: |
| 224 | /* XXX signal race */ |
| 225 | lostconn(); |
| 226 | break; |
| 227 | |
| 228 | case SIGFPE8: |
| 229 | debug = !debug; |
| 230 | break; |
| 231 | |
| 232 | case SIGHUP1: |
| 233 | case SIGINT2: |
| 234 | case SIGQUIT3: |
| 235 | case SIGTERM15: |
| 236 | /* XXX signal race */ |
| 237 | finish(); |
| 238 | break; |
| 239 | |
| 240 | default: |
| 241 | /* XXX signal race */ |
| 242 | fatalerr("No signal handler defined for signal %d.", sig); |
| 243 | } |
| 244 | errno(*__errno()) = save_errno; |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * Function to actually send the command char and message to the |
| 249 | * remote host. |
| 250 | */ |
| 251 | static int |
| 252 | sendcmdmsg(int cmd, char *msg, size_t msgsize) |
| 253 | { |
| 254 | int len; |
| 255 | |
| 256 | if (rem_w < 0) |
| 257 | return(-1); |
| 258 | |
| 259 | /* |
| 260 | * All commands except C_NONE should have a newline |
| 261 | */ |
| 262 | if (cmd != C_NONE'=' && !strchr(msg + 1, '\n')) |
| 263 | (void) strlcat(msg + 1, "\n", msgsize - 1); |
| 264 | |
| 265 | if (cmd == C_NONE'=') |
| 266 | len = strlen(msg); |
| 267 | else { |
| 268 | len = strlen(msg + 1) + 1; |
| 269 | msg[0] = cmd; |
| 270 | } |
| 271 | |
| 272 | debugmsg(DM_PROTO0x02, ">>> Cmd = %c (\\%3.3o) Msg = \"%.*s\"", |
| 273 | cmd, cmd, |
| 274 | (cmd == C_NONE'=') ? len-1 : len-2, |
| 275 | (cmd == C_NONE'=') ? msg : msg + 1); |
| 276 | |
| 277 | return(!(xwrite(rem_w, msg, len) == len)); |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Send a command message to the remote host. |
| 282 | * Called as sendcmd(char cmdchar, char *fmt, arg1, arg2, ...) |
| 283 | * The fmt may be NULL, in which case there are no args. |
| 284 | */ |
| 285 | int |
| 286 | sendcmd(char cmd, const char *fmt, ...) |
| 287 | { |
| 288 | static char buf[BUFSIZ1024]; |
| 289 | va_list args; |
| 290 | |
| 291 | va_start(args, fmt)__builtin_va_start(args, fmt); |
| 292 | if (fmt) |
| 293 | (void) vsnprintf(buf + (cmd != C_NONE'='), |
| 294 | sizeof(buf) - (cmd != C_NONE'='), fmt, args); |
| 295 | else |
| 296 | buf[1] = CNULL'\0'; |
| 297 | va_end(args)__builtin_va_end(args); |
| 298 | |
| 299 | return(sendcmdmsg(cmd, buf, sizeof(buf))); |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * Internal variables and routines for reading lines from the remote. |
| 304 | */ |
| 305 | static u_char rembuf[BUFSIZ1024]; |
| 306 | static u_char *remptr; |
| 307 | static ssize_t remleft; |
| 308 | |
| 309 | #define remc()(--remleft < 0 ? remmore() : *remptr++) (--remleft < 0 ? remmore() : *remptr++) |
| 310 | |
| 311 | /* |
| 312 | * Back end to remote read() |
| 313 | */ |
| 314 | static ssize_t |
| 315 | remread(int fd, u_char *buf, size_t bufsiz) |
| 316 | { |
| 317 | return(read(fd, (char *)buf, bufsiz)); |
| 318 | } |
| 319 | |
| 320 | static int |
| 321 | remmore(void) |
| 322 | { |
| 323 | (void) signal(SIGALRM14, sighandler); |
| 324 | (void) alarm(rtimeout); |
| 325 | |
| 326 | remleft = remread(rem_r, rembuf, sizeof(rembuf)); |
| 327 | |
| 328 | (void) alarm(0); |
| 329 | |
| 330 | if (remleft < 0) |
| 331 | return (-2); /* error */ |
| 332 | if (remleft == 0) |
| 333 | return (-1); /* EOF */ |
| 334 | remptr = rembuf; |
| 335 | remleft--; |
| 336 | return (*remptr++); |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * Read an input line from the remote. Return the number of bytes |
| 341 | * stored (equivalent to strlen(p)). If `cleanup' is set, EOF at |
| 342 | * the beginning of a line is returned as EOF (-1); other EOFs, or |
| 343 | * errors, call cleanup() or lostconn(). In other words, unless |
| 344 | * the third argument is nonzero, this routine never returns failure. |
| 345 | */ |
| 346 | int |
| 347 | remline(u_char *buffer, int space, int doclean) |
| 348 | { |
| 349 | int c, left = space; |
| 350 | u_char *p = buffer; |
| 351 | |
| 352 | if (rem_r < 0) { |
| 353 | error("Cannot read remote input: Remote descriptor not open."); |
| 354 | return(-1); |
| 355 | } |
| 356 | |
| 357 | while (left > 0) { |
| 358 | if ((c = remc()(--remleft < 0 ? remmore() : *remptr++)) < -1) { /* error */ |
| 359 | if (doclean) { |
| 360 | finish(); |
| 361 | /*NOTREACHED*/ |
| 362 | } |
| 363 | lostconn(); |
| 364 | /*NOTREACHED*/ |
| 365 | } |
| 366 | if (c == -1) { /* got EOF */ |
| 367 | if (doclean) { |
| 368 | if (left == space) |
| 369 | return (-1);/* signal proper EOF */ |
| 370 | finish(); /* improper EOF */ |
| 371 | /*NOTREACHED*/ |
| 372 | } |
| 373 | lostconn(); |
| 374 | /*NOTREACHED*/ |
| 375 | } |
| 376 | if (c == '\n') { |
| 377 | *p = CNULL'\0'; |
| 378 | |
| 379 | if (debug) { |
| 380 | static char mbuf[BUFSIZ1024]; |
| 381 | |
| 382 | (void) snprintf(mbuf, sizeof(mbuf), |
| 383 | "<<< Cmd = %c (\\%3.3o) Msg = \"%s\"", |
| 384 | buffer[0], buffer[0], |
| 385 | buffer + 1); |
| 386 | |
| 387 | debugmsg(DM_PROTO0x02, "%s", mbuf); |
| 388 | } |
| 389 | |
| 390 | return (space - left); |
| 391 | } |
| 392 | *p++ = c; |
| 393 | left--; |
| 394 | } |
| 395 | |
| 396 | /* this will probably blow the entire session */ |
| 397 | error("remote input line too long"); |
| 398 | p[-1] = CNULL'\0'; /* truncate */ |
| 399 | return (space); |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Non-line-oriented remote read. |
| 404 | */ |
| 405 | ssize_t |
| 406 | readrem(char *p, ssize_t space) |
| 407 | { |
| 408 | if (remleft <= 0) { |
| 409 | /* |
| 410 | * Set remote time out alarm. |
| 411 | */ |
| 412 | (void) signal(SIGALRM14, sighandler); |
| 413 | (void) alarm(rtimeout); |
| 414 | |
| 415 | remleft = remread(rem_r, rembuf, sizeof(rembuf)); |
| 416 | |
| 417 | (void) alarm(0); |
| 418 | remptr = rembuf; |
| 419 | } |
| 420 | |
| 421 | if (remleft <= 0) |
| 422 | return (remleft); |
| 423 | if (remleft < space) |
| 424 | space = remleft; |
| 425 | |
| 426 | memcpy(p, remptr, space); |
| 427 | |
| 428 | remptr += space; |
| 429 | remleft -= space; |
| 430 | |
| 431 | return (space); |
| 432 | } |
| 433 | |
| 434 | /* |
| 435 | * Get the user name for the uid. |
| 436 | */ |
| 437 | char * |
| 438 | getusername(uid_t uid, char *file, opt_t opts) |
| 439 | { |
| 440 | static char buf[100]; |
| 441 | static uid_t lastuid = (uid_t)-1; |
| 442 | const char *name; |
| 443 | |
| 444 | /* |
| 445 | * The value of opts may have changed so we always |
| 446 | * do the opts check. |
| 447 | */ |
| 448 | if (IS_ON(opts, DO_NUMCHKOWNER)(opts & 0x0080000)) { |
| 449 | (void) snprintf(buf, sizeof(buf), ":%u", uid); |
| 450 | return(buf); |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * Try to avoid passwd lookup. |
| 455 | */ |
| 456 | if (lastuid == uid && buf[0] != '\0' && buf[0] != ':') |
| 457 | return(buf); |
| 458 | |
| 459 | lastuid = uid; |
| 460 | |
| 461 | if ((name = user_from_uid(uid, 1)) == NULL((void *)0)) { |
| 462 | if (IS_ON(opts, DO_DEFOWNER)(opts & 0x0800000) && !isserver) |
| 463 | (void) strlcpy(buf, defowner, sizeof(buf)); |
| 464 | else { |
| 465 | message(MT_WARNING0x0010, |
| 466 | "%s: No password entry for uid %u", file, uid); |
| 467 | (void) snprintf(buf, sizeof(buf), ":%u", uid); |
| 468 | } |
| 469 | } else { |
| 470 | (void) strlcpy(buf, name, sizeof(buf)); |
| 471 | } |
| 472 | |
| 473 | return(buf); |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Get the group name for the gid. |
| 478 | */ |
| 479 | char * |
| 480 | getgroupname(gid_t gid, char *file, opt_t opts) |
| 481 | { |
| 482 | static char buf[100]; |
| 483 | static gid_t lastgid = (gid_t)-1; |
| 484 | const char *name; |
| 485 | |
| 486 | /* |
| 487 | * The value of opts may have changed so we always |
| 488 | * do the opts check. |
| 489 | */ |
| 490 | if (IS_ON(opts, DO_NUMCHKGROUP)(opts & 0x0040000)) { |
| 491 | (void) snprintf(buf, sizeof(buf), ":%u", gid); |
| 492 | return(buf); |
| 493 | } |
| 494 | |
| 495 | /* |
| 496 | * Try to avoid group lookup. |
| 497 | */ |
| 498 | if (lastgid == gid && buf[0] != '\0' && buf[0] != ':') |
| 499 | return(buf); |
| 500 | |
| 501 | lastgid = gid; |
| 502 | |
| 503 | if ((name = group_from_gid(gid, 1)) == NULL((void *)0)) { |
| 504 | if (IS_ON(opts, DO_DEFGROUP)(opts & 0x0400000) && !isserver) |
| 505 | (void) strlcpy(buf, defgroup, sizeof(buf)); |
| 506 | else { |
| 507 | message(MT_WARNING0x0010, "%s: No name for group %u", |
| 508 | file, gid); |
| 509 | (void) snprintf(buf, sizeof(buf), ":%u", gid); |
| 510 | } |
| 511 | } else |
| 512 | (void) strlcpy(buf, name, sizeof(buf)); |
| 513 | |
| 514 | return(buf); |
| 515 | } |
| 516 | |
| 517 | /* |
| 518 | * Read a response from the remote host. |
| 519 | */ |
| 520 | int |
| 521 | response(void) |
| 522 | { |
| 523 | static u_char resp[BUFSIZ1024]; |
| 524 | u_char *s; |
| 525 | int n; |
| 526 | |
| 527 | debugmsg(DM_CALL0x01, "response() start\n"); |
| 528 | |
| 529 | n = remline(s = resp, sizeof(resp), 0); |
| 530 | |
| 531 | n--; |
| 532 | switch (*s++) { |
| 533 | case C_ACK'\5': |
| 534 | debugmsg(DM_PROTO0x02, "received ACK\n"); |
| 535 | return(0); |
| 536 | case C_LOGMSG'\4': |
| 537 | if (n > 0) { |
| 538 | message(MT_CHANGE0x0020, "%s", s); |
| 539 | return(1); |
| 540 | } |
| 541 | debugmsg(DM_PROTO0x02, "received EMPTY logmsg\n"); |
| 542 | return(0); |
| 543 | case C_NOTEMSG'\3': |
| 544 | if (s) |
| 545 | message(MT_NOTICE0x0100, "%s", s); |
| 546 | return(response()); |
| 547 | |
| 548 | default: |
| 549 | s--; |
| 550 | n++; |
| 551 | /* fall into... */ |
| 552 | |
| 553 | case C_ERRMSG'\1': /* Normal error message */ |
| 554 | if (s) |
| 555 | message(MT_NERROR0x0002, "%s", s); |
| 556 | return(-1); |
| 557 | |
| 558 | case C_FERRMSG'\2': /* Fatal error message */ |
| 559 | if (s) |
| 560 | message(MT_FERROR0x0004, "%s", s); |
| 561 | finish(); |
| 562 | return(-1); |
| 563 | } |
| 564 | /*NOTREACHED*/ |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * This should be in expand.c but the other routines call other modules |
| 569 | * that we don't want to load in. |
| 570 | * |
| 571 | * Expand file names beginning with `~' into the |
| 572 | * user's home directory path name. Return a pointer in buf to the |
| 573 | * part corresponding to `file'. |
| 574 | */ |
| 575 | char * |
| 576 | exptilde(char *ebuf, char *file, size_t ebufsize) |
| 577 | { |
| 578 | struct passwd *pw; |
| 579 | char *pw_dir, *rest; |
| 580 | static char lastuser[_PW_NAME_LEN31 + 1]; |
| 581 | static char lastdir[PATH_MAX1024]; |
| 582 | size_t len; |
| 583 | |
| 584 | if (*file != '~') { |
| 585 | notilde: |
| 586 | (void) strlcpy(ebuf, file, ebufsize); |
| 587 | return(ebuf); |
| 588 | } |
| 589 | pw_dir = homedir; |
| 590 | if (*++file == CNULL'\0') { |
| 591 | rest = NULL((void *)0); |
| 592 | } else if (*file == '/') { |
| 593 | rest = file; |
| 594 | } else { |
| 595 | rest = file; |
| 596 | while (*rest && *rest != '/') |
| 597 | rest++; |
| 598 | if (*rest == '/') |
| 599 | *rest = CNULL'\0'; |
| 600 | else |
| 601 | rest = NULL((void *)0); |
| 602 | if (strcmp(locuser, file) != 0) { |
| 603 | if (strcmp(lastuser, file) != 0) { |
| 604 | if ((pw = getpwnam(file)) == NULL((void *)0)) { |
| 605 | error("%s: unknown user name", file); |
| 606 | if (rest != NULL((void *)0)) |
| 607 | *rest = '/'; |
| 608 | return(NULL((void *)0)); |
| 609 | } |
| 610 | strlcpy(lastuser, pw->pw_name, sizeof(lastuser)); |
| 611 | strlcpy(lastdir, pw->pw_dir, sizeof(lastdir)); |
| 612 | } |
| 613 | pw_dir = lastdir; |
| 614 | } |
| 615 | if (rest != NULL((void *)0)) |
| 616 | *rest = '/'; |
| 617 | } |
| 618 | if ((len = strlcpy(ebuf, pw_dir, ebufsize)) >= ebufsize) |
| 619 | goto notilde; |
| 620 | pw_dir = ebuf + len; |
| 621 | if (rest != NULL((void *)0)) { |
| 622 | pw_dir++; |
| 623 | if ((len = strlcat(ebuf, rest, ebufsize)) >= ebufsize) |
Although the value stored to 'len' is used in the enclosing expression, the value is never actually read from 'len' | |
| 624 | goto notilde; |
| 625 | } |
| 626 | return(pw_dir); |
| 627 | } |
| 628 | |
| 629 | |
| 630 | |
| 631 | /* |
| 632 | * Set access and modify times of a given file |
| 633 | */ |
| 634 | int |
| 635 | setfiletime(char *file, time_t atime, time_t mtime) |
| 636 | { |
| 637 | struct timeval tv[2]; |
| 638 | |
| 639 | if (atime != 0 && mtime != 0) { |
| 640 | tv[0].tv_sec = atime; |
| 641 | tv[1].tv_sec = mtime; |
| 642 | tv[0].tv_usec = tv[1].tv_usec = 0; |
| 643 | return (utimes(file, tv)); |
| 644 | } else /* Set to current time */ |
| 645 | return (utimes(file, NULL((void *)0))); |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Get version info |
| 650 | */ |
| 651 | char * |
| 652 | getversion(void) |
| 653 | { |
| 654 | static char buff[BUFSIZ1024]; |
| 655 | |
| 656 | (void) snprintf(buff, sizeof(buff), |
| 657 | "Version %s.%d (%s) - Protocol Version %d, Release %s, Patch level %d", |
| 658 | DISTVERSION"0.92", PATCHLEVEL0, DISTSTATUS"BETA", |
| 659 | VERSION6, DISTVERSION"0.92", PATCHLEVEL0); |
| 660 | |
| 661 | return(buff); |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * Execute a shell command to handle special cases. |
| 666 | * This is now common to both server and client |
| 667 | */ |
| 668 | void |
| 669 | runcommand(char *cmd) |
| 670 | { |
| 671 | ssize_t nread; |
| 672 | pid_t pid, wpid; |
| 673 | char *cp, *s; |
| 674 | char sbuf[BUFSIZ1024], buf[BUFSIZ1024]; |
| 675 | int fd[2], status; |
| 676 | |
| 677 | if (pipe(fd) == -1) { |
| 678 | error("pipe of %s failed: %s", cmd, SYSERRstrerror((*__errno()))); |
| 679 | return; |
| 680 | } |
| 681 | |
| 682 | if ((pid = fork()) == 0) { |
| 683 | /* |
| 684 | * Return everything the shell commands print. |
| 685 | */ |
| 686 | (void) close(0); |
| 687 | (void) close(1); |
| 688 | (void) close(2); |
| 689 | (void) open(_PATH_DEVNULL"/dev/null", O_RDONLY0x0000); |
| 690 | (void) dup(fd[PIPE_WRITE1]); |
| 691 | (void) dup(fd[PIPE_WRITE1]); |
| 692 | (void) close(fd[PIPE_READ0]); |
| 693 | (void) close(fd[PIPE_WRITE1]); |
| 694 | (void) execl(_PATH_BSHELL"/bin/sh", "sh", "-c", cmd, (char *)NULL((void *)0)); |
| 695 | _exit(127); |
| 696 | } |
| 697 | (void) close(fd[PIPE_WRITE1]); |
| 698 | s = sbuf; |
| 699 | *s++ = C_LOGMSG'\4'; |
| 700 | while ((nread = read(fd[PIPE_READ0], buf, sizeof(buf))) > 0) { |
| 701 | cp = buf; |
| 702 | do { |
| 703 | *s++ = *cp++; |
| 704 | if (cp[-1] != '\n') { |
| 705 | if (s < (char *) &sbuf[sizeof(sbuf)-1]) |
| 706 | continue; |
| 707 | *s++ = '\n'; |
| 708 | } |
| 709 | /* |
| 710 | * Throw away blank lines. |
| 711 | */ |
| 712 | if (s == &sbuf[2]) { |
| 713 | s--; |
| 714 | continue; |
| 715 | } |
| 716 | if (isserver) |
| 717 | (void) xwrite(rem_w, sbuf, s - sbuf); |
| 718 | else { |
| 719 | *s = CNULL'\0'; |
| 720 | message(MT_INFO0x0040, "%s", sbuf+1); |
| 721 | } |
| 722 | s = &sbuf[1]; |
| 723 | } while (--nread); |
| 724 | } |
| 725 | if (s > (char *) &sbuf[1]) { |
| 726 | *s++ = '\n'; |
| 727 | if (isserver) |
| 728 | (void) xwrite(rem_w, sbuf, s - sbuf); |
| 729 | else { |
| 730 | *s = CNULL'\0'; |
| 731 | message(MT_INFO0x0040, "%s", sbuf+1); |
| 732 | } |
| 733 | } |
| 734 | while ((wpid = wait(&status)) != pid && wpid != -1) |
| 735 | ; |
| 736 | if (wpid == -1) |
| 737 | status = -1; |
| 738 | (void) close(fd[PIPE_READ0]); |
| 739 | if (status) |
| 740 | error("shell returned %d", status); |
| 741 | else if (isserver) |
| 742 | ack()(void) sendcmd('\5', ((void *)0)); |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * Malloc with error checking |
| 747 | */ |
| 748 | void * |
| 749 | xmalloc(size_t amt) |
| 750 | { |
| 751 | void *ptr; |
| 752 | |
| 753 | if ((ptr = malloc(amt)) == NULL((void *)0)) |
| 754 | fatalerr("Cannot malloc %zu bytes of memory.", amt); |
| 755 | |
| 756 | return (ptr); |
| 757 | } |
| 758 | |
| 759 | /* |
| 760 | * realloc with error checking |
| 761 | */ |
| 762 | void * |
| 763 | xrealloc(void *baseptr, size_t amt) |
| 764 | { |
| 765 | void *new; |
| 766 | |
| 767 | if ((new = realloc(baseptr, amt)) == NULL((void *)0)) |
| 768 | fatalerr("Cannot realloc %zu bytes of memory.", amt); |
| 769 | |
| 770 | return (new); |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * calloc with error checking |
| 775 | */ |
| 776 | void * |
| 777 | xcalloc(size_t num, size_t esize) |
| 778 | { |
| 779 | void *ptr; |
| 780 | |
| 781 | if ((ptr = calloc(num, esize)) == NULL((void *)0)) |
| 782 | fatalerr("Cannot calloc %zu * %zu = %zu bytes of memory.", |
| 783 | num, esize, num * esize); |
| 784 | |
| 785 | return (ptr); |
| 786 | } |
| 787 | |
| 788 | /* |
| 789 | * Strdup with error checking |
| 790 | */ |
| 791 | char * |
| 792 | xstrdup(const char *str) |
| 793 | { |
| 794 | size_t len = strlen(str) + 1; |
| 795 | char *nstr = xmalloc(len); |
| 796 | |
| 797 | return (memcpy(nstr, str, len)); |
| 798 | } |
| 799 | |
| 800 | /* |
| 801 | * Private version of basename() |
| 802 | */ |
| 803 | char * |
| 804 | xbasename(char *path) |
| 805 | { |
| 806 | char *cp; |
| 807 | |
| 808 | if ((cp = strrchr(path, '/')) != NULL((void *)0)) |
| 809 | return(cp+1); |
| 810 | else |
| 811 | return(path); |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * Take a colon (':') separated path to a file and |
| 816 | * search until a component of that path is found and |
| 817 | * return the found file name. |
| 818 | */ |
| 819 | char * |
| 820 | searchpath(char *path) |
| 821 | { |
| 822 | char *file; |
| 823 | char *space; |
| 824 | int found; |
| 825 | struct stat statbuf; |
| 826 | |
| 827 | for (found = 0; !found && (file = strsep(&path, ":")) != NULL((void *)0); ) { |
| 828 | if ((space = strchr(file, ' ')) != NULL((void *)0)) |
| 829 | *space = CNULL'\0'; |
| 830 | found = stat(file, &statbuf) == 0; |
| 831 | if (space) |
| 832 | *space = ' '; /* Put back what we zapped */ |
| 833 | } |
| 834 | return (file); |
| 835 | } |