crypto/openssh-4/sftp.c

   1 /* $OpenBSD: sftp.c,v 1.96 2007/01/03 04:09:15 stevesk Exp $ */
   2 /*
   3  * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "includes.h"
  19
  20 #include <sys/types.h>
  21 #include <sys/ioctl.h>
  22 #ifdef HAVE_SYS_STAT_H
  23 # include <sys/stat.h>
  24 #endif
  25 #include <sys/param.h>
  26 #include <sys/socket.h>
  27 #include <sys/wait.h>
  28
  29 #include <errno.h>
  30
  31 #ifdef HAVE_PATHS_H
  32 # include <paths.h>
  33 #endif
  34 #ifdef USE_LIBEDIT
  35 #include <histedit.h>
  36 #else
  37 typedef void EditLine;
  38 #endif
  39 #include <signal.h>
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44 #include <stdarg.h>
  45
  46 #include "xmalloc.h"
  47 #include "log.h"
  48 #include "pathnames.h"
  49 #include "misc.h"
  50
  51 #include "sftp.h"
  52 #include "buffer.h"
  53 #include "sftp-common.h"
  54 #include "sftp-client.h"
  55
  56 /* File to read commands from */
  57 FILE* infile;
  58
  59 /* Are we in batchfile mode? */
  60 int batchmode = 0;
  61
  62 /* Size of buffer used when copying files */
  63 size_t copy_buffer_len = 32768;
  64
  65 /* Number of concurrent outstanding requests */
  66 size_t num_requests = 16;
  67
  68 /* PID of ssh transport process */
  69 static pid_t sshpid = -1;
  70
  71 /* This is set to 0 if the progressmeter is not desired. */
  72 int showprogress = 1;
  73
  74 /* SIGINT received during command processing */
  75 volatile sig_atomic_t interrupted = 0;
  76
  77 /* I wish qsort() took a separate ctx for the comparison function...*/
  78 int sort_flag;
  79
  80 int remote_glob(struct sftp_conn *, const char *, int,
  81     int (*)(const char *, int), glob_t *); /* proto for sftp-glob.c */
  82
  83 extern char *__progname;
  84
  85 /* Separators for interactive commands */
  86 #define WHITESPACE " \t\r\n"
  87
  88 /* ls flags */
  89 #define LS_LONG_VIEW    0x01    /* Full view ala ls -l */
  90 #define LS_SHORT_VIEW   0x02    /* Single row view ala ls -1 */
  91 #define LS_NUMERIC_VIEW 0x04    /* Long view with numeric uid/gid */
  92 #define LS_NAME_SORT    0x08    /* Sort by name (default) */
  93 #define LS_TIME_SORT    0x10    /* Sort by mtime */
  94 #define LS_SIZE_SORT    0x20    /* Sort by file size */
  95 #define LS_REVERSE_SORT 0x40    /* Reverse sort order */
  96 #define LS_SHOW_ALL     0x80    /* Don't skip filenames starting with '.' */
  97
  98 #define VIEW_FLAGS      (LS_LONG_VIEW|LS_SHORT_VIEW|LS_NUMERIC_VIEW)
  99 #define SORT_FLAGS      (LS_NAME_SORT|LS_TIME_SORT|LS_SIZE_SORT)
 100
 101 /* Commands for interactive mode */
 102 #define I_CHDIR         1
 103 #define I_CHGRP         2
 104 #define I_CHMOD         3
 105 #define I_CHOWN         4
 106 #define I_GET           5
 107 #define I_HELP          6
 108 #define I_LCHDIR        7
 109 #define I_LLS           8
 110 #define I_LMKDIR        9
 111 #define I_LPWD          10
 112 #define I_LS            11
 113 #define I_LUMASK        12
 114 #define I_MKDIR         13
 115 #define I_PUT           14
 116 #define I_PWD           15
 117 #define I_QUIT          16
 118 #define I_RENAME        17
 119 #define I_RM            18
 120 #define I_RMDIR         19
 121 #define I_SHELL         20
 122 #define I_SYMLINK       21
 123 #define I_VERSION       22
 124 #define I_PROGRESS      23
 125
 126 struct CMD {
 127         const char *c;
 128         const int n;
 129 };
 130
 131 static const struct CMD cmds[] = {
 132         { "bye",        I_QUIT },
 133         { "cd",         I_CHDIR },
 134         { "chdir",      I_CHDIR },
 135         { "chgrp",      I_CHGRP },
 136         { "chmod",      I_CHMOD },
 137         { "chown",      I_CHOWN },
 138         { "dir",        I_LS },
 139         { "exit",       I_QUIT },
 140         { "get",        I_GET },
 141         { "mget",       I_GET },
 142         { "help",       I_HELP },
 143         { "lcd",        I_LCHDIR },
 144         { "lchdir",     I_LCHDIR },
 145         { "lls",        I_LLS },
 146         { "lmkdir",     I_LMKDIR },
 147         { "ln",         I_SYMLINK },
 148         { "lpwd",       I_LPWD },
 149         { "ls",         I_LS },
 150         { "lumask",     I_LUMASK },
 151         { "mkdir",      I_MKDIR },
 152         { "progress",   I_PROGRESS },
 153         { "put",        I_PUT },
 154         { "mput",       I_PUT },
 155         { "pwd",        I_PWD },
 156         { "quit",       I_QUIT },
 157         { "rename",     I_RENAME },
 158         { "rm",         I_RM },
 159         { "rmdir",      I_RMDIR },
 160         { "symlink",    I_SYMLINK },
 161         { "version",    I_VERSION },
 162         { "!",          I_SHELL },
 163         { "?",          I_HELP },
 164         { NULL,                 -1}
 165 };
 166
 167 int interactive_loop(int fd_in, int fd_out, char *file1, char *file2);
 168
 169 /* ARGSUSED */
 170 static void
 171 killchild(int signo)
 172 {
 173         if (sshpid > 1) {
 174                 kill(sshpid, SIGTERM);
 175                 waitpid(sshpid, NULL, 0);
 176         }
 177
 178         _exit(1);
 179 }
 180
 181 /* ARGSUSED */
 182 static void
 183 cmd_interrupt(int signo)
 184 {
 185         const char msg[] = "\rInterrupt  \n";
 186         int olderrno = errno;
 187
 188         write(STDERR_FILENO, msg, sizeof(msg) - 1);
 189         interrupted = 1;
 190         errno = olderrno;
 191 }
 192
 193 static void
 194 help(void)
 195 {
 196         printf("Available commands:\n");
 197         printf("cd path                       Change remote directory to 'path'\n");
 198         printf("lcd path                      Change local directory to 'path'\n");
 199         printf("chgrp grp path                Change group of file 'path' to 'grp'\n");
 200         printf("chmod mode path               Change permissions of file 'path' to 'mode'\n");
 201         printf("chown own path                Change owner of file 'path' to 'own'\n");
 202         printf("help                          Display this help text\n");
 203         printf("get remote-path [local-path]  Download file\n");
 204         printf("lls [ls-options [path]]       Display local directory listing\n");
 205         printf("ln oldpath newpath            Symlink remote file\n");
 206         printf("lmkdir path                   Create local directory\n");
 207         printf("lpwd                          Print local working directory\n");
 208         printf("ls [path]                     Display remote directory listing\n");
 209         printf("lumask umask                  Set local umask to 'umask'\n");
 210         printf("mkdir path                    Create remote directory\n");
 211         printf("progress                      Toggle display of progress meter\n");
 212         printf("put local-path [remote-path]  Upload file\n");
 213         printf("pwd                           Display remote working directory\n");
 214         printf("exit                          Quit sftp\n");
 215         printf("quit                          Quit sftp\n");
 216         printf("rename oldpath newpath        Rename remote file\n");
 217         printf("rmdir path                    Remove remote directory\n");
 218         printf("rm path                       Delete remote file\n");
 219         printf("symlink oldpath newpath       Symlink remote file\n");
 220         printf("version                       Show SFTP version\n");
 221         printf("!command                      Execute 'command' in local shell\n");
 222         printf("!                             Escape to local shell\n");
 223         printf("?                             Synonym for help\n");
 224 }
 225
 226 static void
 227 local_do_shell(const char *args)
 228 {
 229         int status;
 230         char *shell;
 231         pid_t pid;
 232
 233         if (!*args)
 234                 args = NULL;
 235
 236         if ((shell = getenv("SHELL")) == NULL)
 237                 shell = _PATH_BSHELL;
 238
 239         if ((pid = fork()) == -1)
 240                 fatal("Couldn't fork: %s", strerror(errno));
 241
 242         if (pid == 0) {
 243                 /* XXX: child has pipe fds to ssh subproc open - issue? */
 244                 if (args) {
 245                         debug3("Executing %s -c \"%s\"", shell, args);
 246                         execl(shell, shell, "-c", args, (char *)NULL);
 247                 } else {
 248                         debug3("Executing %s", shell);
 249                         execl(shell, shell, (char *)NULL);
 250                 }
 251                 fprintf(stderr, "Couldn't execute \"%s\": %s\n", shell,
 252                     strerror(errno));
 253                 _exit(1);
 254         }
 255         while (waitpid(pid, &status, 0) == -1)
 256                 if (errno != EINTR)
 257                         fatal("Couldn't wait for child: %s", strerror(errno));
 258         if (!WIFEXITED(status))
 259                 error("Shell exited abnormally");
 260         else if (WEXITSTATUS(status))
 261                 error("Shell exited with status %d", WEXITSTATUS(status));
 262 }
 263
 264 static void
 265 local_do_ls(const char *args)
 266 {
 267         if (!args || !*args)
 268                 local_do_shell(_PATH_LS);
 269         else {
 270                 int len = strlen(_PATH_LS " ") + strlen(args) + 1;
 271                 char *buf = xmalloc(len);
 272
 273                 /* XXX: quoting - rip quoting code from ftp? */
 274                 snprintf(buf, len, _PATH_LS " %s", args);
 275                 local_do_shell(buf);
 276                 xfree(buf);
 277         }
 278 }
 279
 280 /* Strip one path (usually the pwd) from the start of another */
 281 static char *
 282 path_strip(char *path, char *strip)
 283 {
 284         size_t len;
 285
 286         if (strip == NULL)
 287                 return (xstrdup(path));
 288
 289         len = strlen(strip);
 290         if (strncmp(path, strip, len) == 0) {
 291                 if (strip[len - 1] != '/' && path[len] == '/')
 292                         len++;
 293                 return (xstrdup(path + len));
 294         }
 295
 296         return (xstrdup(path));
 297 }
 298
 299 static char *
 300 path_append(char *p1, char *p2)
 301 {
 302         char *ret;
 303         size_t len = strlen(p1) + strlen(p2) + 2;
 304
 305         ret = xmalloc(len);
 306         strlcpy(ret, p1, len);
 307         if (p1[0] != '\0' && p1[strlen(p1) - 1] != '/')
 308                 strlcat(ret, "/", len);
 309         strlcat(ret, p2, len);
 310
 311         return(ret);
 312 }
 313
 314 static char *
 315 make_absolute(char *p, char *pwd)
 316 {
 317         char *abs_str;
 318
 319         /* Derelativise */
 320         if (p && p[0] != '/') {
 321                 abs_str = path_append(pwd, p);
 322                 xfree(p);
 323                 return(abs_str);
 324         } else
 325                 return(p);
 326 }
 327
 328 static int
 329 infer_path(const char *p, char **ifp)
 330 {
 331         char *cp;
 332
 333         cp = strrchr(p, '/');
 334         if (cp == NULL) {
 335                 *ifp = xstrdup(p);
 336                 return(0);
 337         }
 338
 339         if (!cp[1]) {
 340                 error("Invalid path");
 341                 return(-1);
 342         }
 343
 344         *ifp = xstrdup(cp + 1);
 345         return(0);
 346 }
 347
 348 static int
 349 parse_getput_flags(const char **cpp, int *pflag)
 350 {
 351         const char *cp = *cpp;
 352
 353         /* Check for flags */
 354         if (cp[0] == '-' && cp[1] && strchr(WHITESPACE, cp[2])) {
 355                 switch (cp[1]) {
 356                 case 'p':
 357                 case 'P':
 358                         *pflag = 1;
 359                         break;
 360                 default:
 361                         error("Invalid flag -%c", cp[1]);
 362                         return(-1);
 363                 }
 364                 cp += 2;
 365                 *cpp = cp + strspn(cp, WHITESPACE);
 366         }
 367
 368         return(0);
 369 }
 370
 371 static int
 372 parse_ls_flags(const char **cpp, int *lflag)
 373 {
 374         const char *cp = *cpp;
 375
 376         /* Defaults */
 377         *lflag = LS_NAME_SORT;
 378
 379         /* Check for flags */
 380         if (cp++[0] == '-') {
 381                 for (; strchr(WHITESPACE, *cp) == NULL; cp++) {
 382                         switch (*cp) {
 383                         case 'l':
 384                                 *lflag &= ~VIEW_FLAGS;
 385                                 *lflag |= LS_LONG_VIEW;
 386                                 break;
 387                         case '1':
 388                                 *lflag &= ~VIEW_FLAGS;
 389                                 *lflag |= LS_SHORT_VIEW;
 390                                 break;
 391                         case 'n':
 392                                 *lflag &= ~VIEW_FLAGS;
 393                                 *lflag |= LS_NUMERIC_VIEW|LS_LONG_VIEW;
 394                                 break;
 395                         case 'S':
 396                                 *lflag &= ~SORT_FLAGS;
 397                                 *lflag |= LS_SIZE_SORT;
 398                                 break;
 399                         case 't':
 400                                 *lflag &= ~SORT_FLAGS;
 401                                 *lflag |= LS_TIME_SORT;
 402                                 break;
 403                         case 'r':
 404                                 *lflag |= LS_REVERSE_SORT;
 405                                 break;
 406                         case 'f':
 407                                 *lflag &= ~SORT_FLAGS;
 408                                 break;
 409                         case 'a':
 410                                 *lflag |= LS_SHOW_ALL;
 411                                 break;
 412                         default:
 413                                 error("Invalid flag -%c", *cp);
 414                                 return(-1);
 415                         }
 416                 }
 417                 *cpp = cp + strspn(cp, WHITESPACE);
 418         }
 419
 420         return(0);
 421 }
 422
 423 static int
 424 get_pathname(const char **cpp, char **path)
 425 {
 426         const char *cp = *cpp, *end;
 427         char quot;
 428         u_int i, j;
 429
 430         cp += strspn(cp, WHITESPACE);
 431         if (!*cp) {
 432                 *cpp = cp;
 433                 *path = NULL;
 434                 return (0);
 435         }
 436
 437         *path = xmalloc(strlen(cp) + 1);
 438
 439         /* Check for quoted filenames */
 440         if (*cp == '\"' || *cp == '\'') {
 441                 quot = *cp++;
 442
 443                 /* Search for terminating quote, unescape some chars */
 444                 for (i = j = 0; i <= strlen(cp); i++) {
 445                         if (cp[i] == quot) {    /* Found quote */
 446                                 i++;
 447                                 (*path)[j] = '\0';
 448                                 break;
 449                         }
 450                         if (cp[i] == '\0') {    /* End of string */
 451                                 error("Unterminated quote");
 452                                 goto fail;
 453                         }
 454                         if (cp[i] == '\\') {    /* Escaped characters */
 455                                 i++;
 456                                 if (cp[i] != '\'' && cp[i] != '\"' &&
 457                                     cp[i] != '\\') {
 458                                         error("Bad escaped character '\\%c'",
 459                                             cp[i]);
 460                                         goto fail;
 461                                 }
 462                         }
 463                         (*path)[j++] = cp[i];
 464                 }
 465
 466                 if (j == 0) {
 467                         error("Empty quotes");
 468                         goto fail;
 469                 }
 470                 *cpp = cp + i + strspn(cp + i, WHITESPACE);
 471         } else {
 472                 /* Read to end of filename */
 473                 end = strpbrk(cp, WHITESPACE);
 474                 if (end == NULL)
 475                         end = strchr(cp, '\0');
 476                 *cpp = end + strspn(end, WHITESPACE);
 477
 478                 memcpy(*path, cp, end - cp);
 479                 (*path)[end - cp] = '\0';
 480         }
 481         return (0);
 482
 483  fail:
 484         xfree(*path);
 485         *path = NULL;
 486         return (-1);
 487 }
 488
 489 static int
 490 is_dir(char *path)
 491 {
 492         struct stat sb;
 493
 494         /* XXX: report errors? */
 495         if (stat(path, &sb) == -1)
 496                 return(0);
 497
 498         return(S_ISDIR(sb.st_mode));
 499 }
 500
 501 static int
 502 is_reg(char *path)
 503 {
 504         struct stat sb;
 505
 506         if (stat(path, &sb) == -1)
 507                 fatal("stat %s: %s", path, strerror(errno));
 508
 509         return(S_ISREG(sb.st_mode));
 510 }
 511
 512 static int
 513 remote_is_dir(struct sftp_conn *conn, char *path)
 514 {
 515         Attrib *a;
 516
 517         /* XXX: report errors? */
 518         if ((a = do_stat(conn, path, 1)) == NULL)
 519                 return(0);
 520         if (!(a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS))
 521                 return(0);
 522         return(S_ISDIR(a->perm));
 523 }
 524
 525 static int
 526 process_get(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
 527 {
 528         char *abs_src = NULL;
 529         char *abs_dst = NULL;
 530         char *tmp;
 531         glob_t g;
 532         int err = 0;
 533         int i;
 534
 535         abs_src = xstrdup(src);
 536         abs_src = make_absolute(abs_src, pwd);
 537
 538         memset(&g, 0, sizeof(g));
 539         debug3("Looking up %s", abs_src);
 540         if (remote_glob(conn, abs_src, 0, NULL, &g)) {
 541                 error("File \"%s\" not found.", abs_src);
 542                 err = -1;
 543                 goto out;
 544         }
 545
 546         /* If multiple matches, dst must be a directory or unspecified */
 547         if (g.gl_matchc > 1 && dst && !is_dir(dst)) {
 548                 error("Multiple files match, but \"%s\" is not a directory",
 549                     dst);
 550                 err = -1;
 551                 goto out;
 552         }
 553
 554         for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
 555                 if (infer_path(g.gl_pathv[i], &tmp)) {
 556                         err = -1;
 557                         goto out;
 558                 }
 559
 560                 if (g.gl_matchc == 1 && dst) {
 561                         /* If directory specified, append filename */
 562                         xfree(tmp);
 563                         if (is_dir(dst)) {
 564                                 if (infer_path(g.gl_pathv[0], &tmp)) {
 565                                         err = 1;
 566                                         goto out;
 567                                 }
 568                                 abs_dst = path_append(dst, tmp);
 569                                 xfree(tmp);
 570                         } else
 571                                 abs_dst = xstrdup(dst);
 572                 } else if (dst) {
 573                         abs_dst = path_append(dst, tmp);
 574                         xfree(tmp);
 575                 } else
 576                         abs_dst = tmp;
 577
 578                 printf("Fetching %s to %s\n", g.gl_pathv[i], abs_dst);
 579                 if (do_download(conn, g.gl_pathv[i], abs_dst, pflag) == -1)
 580                         err = -1;
 581                 xfree(abs_dst);
 582                 abs_dst = NULL;
 583         }
 584
 585 out:
 586         xfree(abs_src);
 587         globfree(&g);
 588         return(err);
 589 }
 590
 591 static int
 592 process_put(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
 593 {
 594         char *tmp_dst = NULL;
 595         char *abs_dst = NULL;
 596         char *tmp;
 597         glob_t g;
 598         int err = 0;
 599         int i;
 600
 601         if (dst) {
 602                 tmp_dst = xstrdup(dst);
 603                 tmp_dst = make_absolute(tmp_dst, pwd);
 604         }
 605
 606         memset(&g, 0, sizeof(g));
 607         debug3("Looking up %s", src);
 608         if (glob(src, 0, NULL, &g)) {
 609                 error("File \"%s\" not found.", src);
 610                 err = -1;
 611                 goto out;
 612         }
 613
 614         /* If multiple matches, dst may be directory or unspecified */
 615         if (g.gl_matchc > 1 && tmp_dst && !remote_is_dir(conn, tmp_dst)) {
 616                 error("Multiple files match, but \"%s\" is not a directory",
 617                     tmp_dst);
 618                 err = -1;
 619                 goto out;
 620         }
 621
 622         for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
 623                 if (!is_reg(g.gl_pathv[i])) {
 624                         error("skipping non-regular file %s",
 625                             g.gl_pathv[i]);
 626                         continue;
 627                 }
 628                 if (infer_path(g.gl_pathv[i], &tmp)) {
 629                         err = -1;
 630                         goto out;
 631                 }
 632
 633                 if (g.gl_matchc == 1 && tmp_dst) {
 634                         /* If directory specified, append filename */
 635                         if (remote_is_dir(conn, tmp_dst)) {
 636                                 if (infer_path(g.gl_pathv[0], &tmp)) {
 637                                         err = 1;
 638                                         goto out;
 639                                 }
 640                                 abs_dst = path_append(tmp_dst, tmp);
 641                                 xfree(tmp);
 642                         } else
 643                                 abs_dst = xstrdup(tmp_dst);
 644
 645                 } else if (tmp_dst) {
 646                         abs_dst = path_append(tmp_dst, tmp);
 647                         xfree(tmp);
 648                 } else
 649                         abs_dst = make_absolute(tmp, pwd);
 650
 651                 printf("Uploading %s to %s\n", g.gl_pathv[i], abs_dst);
 652                 if (do_upload(conn, g.gl_pathv[i], abs_dst, pflag) == -1)
 653                         err = -1;
 654         }
 655
 656 out:
 657         if (abs_dst)
 658                 xfree(abs_dst);
 659         if (tmp_dst)
 660                 xfree(tmp_dst);
 661         globfree(&g);
 662         return(err);
 663 }
 664
 665 static int
 666 sdirent_comp(const void *aa, const void *bb)
 667 {
 668         SFTP_DIRENT *a = *(SFTP_DIRENT **)aa;
 669         SFTP_DIRENT *b = *(SFTP_DIRENT **)bb;
 670         int rmul = sort_flag & LS_REVERSE_SORT ? -1 : 1;
 671
 672 #define NCMP(a,b) (a == b ? 0 : (a < b ? 1 : -1))
 673         if (sort_flag & LS_NAME_SORT)
 674                 return (rmul * strcmp(a->filename, b->filename));
 675         else if (sort_flag & LS_TIME_SORT)
 676                 return (rmul * NCMP(a->a.mtime, b->a.mtime));
 677         else if (sort_flag & LS_SIZE_SORT)
 678                 return (rmul * NCMP(a->a.size, b->a.size));
 679
 680         fatal("Unknown ls sort type");
 681 }
 682
 683 /* sftp ls.1 replacement for directories */
 684 static int
 685 do_ls_dir(struct sftp_conn *conn, char *path, char *strip_path, int lflag)
 686 {
 687         int n;
 688         u_int c = 1, colspace = 0, columns = 1;
 689         SFTP_DIRENT **d;
 690
 691         if ((n = do_readdir(conn, path, &d)) != 0)
 692                 return (n);
 693
 694         if (!(lflag & LS_SHORT_VIEW)) {
 695                 u_int m = 0, width = 80;
 696                 struct winsize ws;
 697                 char *tmp;
 698
 699                 /* Count entries for sort and find longest filename */
 700                 for (n = 0; d[n] != NULL; n++) {
 701                         if (d[n]->filename[0] != '.' || (lflag & LS_SHOW_ALL))
 702                                 m = MAX(m, strlen(d[n]->filename));
 703                 }
 704
 705                 /* Add any subpath that also needs to be counted */
 706                 tmp = path_strip(path, strip_path);
 707                 m += strlen(tmp);
 708                 xfree(tmp);
 709
 710                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) != -1)
 711                         width = ws.ws_col;
 712
 713                 columns = width / (m + 2);
 714                 columns = MAX(columns, 1);
 715                 colspace = width / columns;
 716                 colspace = MIN(colspace, width);
 717         }
 718
 719         if (lflag & SORT_FLAGS) {
 720                 for (n = 0; d[n] != NULL; n++)
 721                         ;       /* count entries */
 722                 sort_flag = lflag & (SORT_FLAGS|LS_REVERSE_SORT);
 723                 qsort(d, n, sizeof(*d), sdirent_comp);
 724         }
 725
 726         for (n = 0; d[n] != NULL && !interrupted; n++) {
 727                 char *tmp, *fname;
 728
 729                 if (d[n]->filename[0] == '.' && !(lflag & LS_SHOW_ALL))
 730                         continue;
 731
 732                 tmp = path_append(path, d[n]->filename);
 733                 fname = path_strip(tmp, strip_path);
 734                 xfree(tmp);
 735
 736                 if (lflag & LS_LONG_VIEW) {
 737                         if (lflag & LS_NUMERIC_VIEW) {
 738                                 char *lname;
 739                                 struct stat sb;
 740
 741                                 memset(&sb, 0, sizeof(sb));
 742                                 attrib_to_stat(&d[n]->a, &sb);
 743                                 lname = ls_file(fname, &sb, 1);
 744                                 printf("%s\n", lname);
 745                                 xfree(lname);
 746                         } else
 747                                 printf("%s\n", d[n]->longname);
 748                 } else {
 749                         printf("%-*s", colspace, fname);
 750                         if (c >= columns) {
 751                                 printf("\n");
 752                                 c = 1;
 753                         } else
 754                                 c++;
 755                 }
 756
 757                 xfree(fname);
 758         }
 759
 760         if (!(lflag & LS_LONG_VIEW) && (c != 1))
 761                 printf("\n");
 762
 763         free_sftp_dirents(d);
 764         return (0);
 765 }
 766
 767 /* sftp ls.1 replacement which handles path globs */
 768 static int
 769 do_globbed_ls(struct sftp_conn *conn, char *path, char *strip_path,
 770     int lflag)
 771 {
 772         glob_t g;
 773         u_int i, c = 1, colspace = 0, columns = 1;
 774         Attrib *a = NULL;
 775
 776         memset(&g, 0, sizeof(g));
 777
 778         if (remote_glob(conn, path, GLOB_MARK|GLOB_NOCHECK|GLOB_BRACE,
 779             NULL, &g) || (g.gl_pathc && !g.gl_matchc)) {
 780                 if (g.gl_pathc)
 781                         globfree(&g);
 782                 error("Can't ls: \"%s\" not found", path);
 783                 return (-1);
 784         }
 785
 786         if (interrupted)
 787                 goto out;
 788
 789         /*
 790          * If the glob returns a single match and it is a directory,
 791          * then just list its contents.
 792          */
 793         if (g.gl_matchc == 1) {
 794                 if ((a = do_lstat(conn, g.gl_pathv[0], 1)) == NULL) {
 795                         globfree(&g);
 796                         return (-1);
 797                 }
 798                 if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
 799                     S_ISDIR(a->perm)) {
 800                         int err;
 801
 802                         err = do_ls_dir(conn, g.gl_pathv[0], strip_path, lflag);
 803                         globfree(&g);
 804                         return (err);
 805                 }
 806         }
 807
 808         if (!(lflag & LS_SHORT_VIEW)) {
 809                 u_int m = 0, width = 80;
 810                 struct winsize ws;
 811
 812                 /* Count entries for sort and find longest filename */
 813                 for (i = 0; g.gl_pathv[i]; i++)
 814                         m = MAX(m, strlen(g.gl_pathv[i]));
 815
 816                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) != -1)
 817                         width = ws.ws_col;
 818
 819                 columns = width / (m + 2);
 820                 columns = MAX(columns, 1);
 821                 colspace = width / columns;
 822         }
 823
 824         for (i = 0; g.gl_pathv[i] && !interrupted; i++, a = NULL) {
 825                 char *fname;
 826
 827                 fname = path_strip(g.gl_pathv[i], strip_path);
 828
 829                 if (lflag & LS_LONG_VIEW) {
 830                         char *lname;
 831                         struct stat sb;
 832
 833                         /*
 834                          * XXX: this is slow - 1 roundtrip per path
 835                          * A solution to this is to fork glob() and
 836                          * build a sftp specific version which keeps the
 837                          * attribs (which currently get thrown away)
 838                          * that the server returns as well as the filenames.
 839                          */
 840                         memset(&sb, 0, sizeof(sb));
 841                         if (a == NULL)
 842                                 a = do_lstat(conn, g.gl_pathv[i], 1);
 843                         if (a != NULL)
 844                                 attrib_to_stat(a, &sb);
 845                         lname = ls_file(fname, &sb, 1);
 846                         printf("%s\n", lname);
 847                         xfree(lname);
 848                 } else {
 849                         printf("%-*s", colspace, fname);
 850                         if (c >= columns) {
 851                                 printf("\n");
 852                                 c = 1;
 853                         } else
 854                                 c++;
 855                 }
 856                 xfree(fname);
 857         }
 858
 859         if (!(lflag & LS_LONG_VIEW) && (c != 1))
 860                 printf("\n");
 861
 862  out:
 863         if (g.gl_pathc)
 864                 globfree(&g);
 865
 866         return (0);
 867 }
 868
 869 static int
 870 parse_args(const char **cpp, int *pflag, int *lflag, int *iflag,
 871     unsigned long *n_arg, char **path1, char **path2)
 872 {
 873         const char *cmd, *cp = *cpp;
 874         char *cp2;
 875         int base = 0;
 876         long l;
 877         int i, cmdnum;
 878
 879         /* Skip leading whitespace */
 880         cp = cp + strspn(cp, WHITESPACE);
 881
 882         /* Ignore blank lines and lines which begin with comment '#' char */
 883         if (*cp == '\0' || *cp == '#')
 884                 return (0);
 885
 886         /* Check for leading '-' (disable error processing) */
 887         *iflag = 0;
 888         if (*cp == '-') {
 889                 *iflag = 1;
 890                 cp++;
 891         }
 892
 893         /* Figure out which command we have */
 894         for (i = 0; cmds[i].c; i++) {
 895                 int cmdlen = strlen(cmds[i].c);
 896
 897                 /* Check for command followed by whitespace */
 898                 if (!strncasecmp(cp, cmds[i].c, cmdlen) &&
 899                     strchr(WHITESPACE, cp[cmdlen])) {
 900                         cp += cmdlen;
 901                         cp = cp + strspn(cp, WHITESPACE);
 902                         break;
 903                 }
 904         }
 905         cmdnum = cmds[i].n;
 906         cmd = cmds[i].c;
 907
 908         /* Special case */
 909         if (*cp == '!') {
 910                 cp++;
 911                 cmdnum = I_SHELL;
 912         } else if (cmdnum == -1) {
 913                 error("Invalid command.");
 914                 return (-1);
 915         }
 916
 917         /* Get arguments and parse flags */
 918         *lflag = *pflag = *n_arg = 0;
 919         *path1 = *path2 = NULL;
 920         switch (cmdnum) {
 921         case I_GET:
 922         case I_PUT:
 923                 if (parse_getput_flags(&cp, pflag))
 924                         return(-1);
 925                 /* Get first pathname (mandatory) */
 926                 if (get_pathname(&cp, path1))
 927                         return(-1);
 928                 if (*path1 == NULL) {
 929                         error("You must specify at least one path after a "
 930                             "%s command.", cmd);
 931                         return(-1);
 932                 }
 933                 /* Try to get second pathname (optional) */
 934                 if (get_pathname(&cp, path2))
 935                         return(-1);
 936                 break;
 937         case I_RENAME:
 938         case I_SYMLINK:
 939                 if (get_pathname(&cp, path1))
 940                         return(-1);
 941                 if (get_pathname(&cp, path2))
 942                         return(-1);
 943                 if (!*path1 || !*path2) {
 944                         error("You must specify two paths after a %s "
 945                             "command.", cmd);
 946                         return(-1);
 947                 }
 948                 break;
 949         case I_RM:
 950         case I_MKDIR:
 951         case I_RMDIR:
 952         case I_CHDIR:
 953         case I_LCHDIR:
 954         case I_LMKDIR:
 955                 /* Get pathname (mandatory) */
 956                 if (get_pathname(&cp, path1))
 957                         return(-1);
 958                 if (*path1 == NULL) {
 959                         error("You must specify a path after a %s command.",
 960                             cmd);
 961                         return(-1);
 962                 }
 963                 break;
 964         case I_LS:
 965                 if (parse_ls_flags(&cp, lflag))
 966                         return(-1);
 967                 /* Path is optional */
 968                 if (get_pathname(&cp, path1))
 969                         return(-1);
 970                 break;
 971         case I_LLS:
 972         case I_SHELL:
 973                 /* Uses the rest of the line */
 974                 break;
 975         case I_LUMASK:
 976                 base = 8;
 977         case I_CHMOD:
 978                 base = 8;
 979         case I_CHOWN:
 980         case I_CHGRP:
 981                 /* Get numeric arg (mandatory) */
 982                 errno = 0;
 983                 l = strtol(cp, &cp2, base);
 984                 if (cp2 == cp || ((l == LONG_MIN || l == LONG_MAX) &&
 985                     errno == ERANGE) || l < 0) {
 986                         error("You must supply a numeric argument "
 987                             "to the %s command.", cmd);
 988                         return(-1);
 989                 }
 990                 cp = cp2;
 991                 *n_arg = l;
 992                 if (cmdnum == I_LUMASK && strchr(WHITESPACE, *cp))
 993                         break;
 994                 if (cmdnum == I_LUMASK || !strchr(WHITESPACE, *cp)) {
 995                         error("You must supply a numeric argument "
 996                             "to the %s command.", cmd);
 997                         return(-1);
 998                 }
 999                 cp += strspn(cp, WHITESPACE);
1000
1001                 /* Get pathname (mandatory) */
1002                 if (get_pathname(&cp, path1))
1003                         return(-1);
1004                 if (*path1 == NULL) {
1005                         error("You must specify a path after a %s command.",
1006                             cmd);
1007                         return(-1);
1008                 }
1009                 break;
1010         case I_QUIT:
1011         case I_PWD:
1012         case I_LPWD:
1013         case I_HELP:
1014         case I_VERSION:
1015         case I_PROGRESS:
1016                 break;
1017         default:
1018                 fatal("Command not implemented");
1019         }
1020
1021         *cpp = cp;
1022         return(cmdnum);
1023 }
1024
1025 static int
1026 parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
1027     int err_abort)
1028 {
1029         char *path1, *path2, *tmp;
1030         int pflag, lflag, iflag, cmdnum, i;
1031         unsigned long n_arg;
1032         Attrib a, *aa;
1033         char path_buf[MAXPATHLEN];
1034         int err = 0;
1035         glob_t g;
1036
1037         path1 = path2 = NULL;
1038         cmdnum = parse_args(&cmd, &pflag, &lflag, &iflag, &n_arg,
1039             &path1, &path2);
1040
1041         if (iflag != 0)
1042                 err_abort = 0;
1043
1044         memset(&g, 0, sizeof(g));
1045
1046         /* Perform command */
1047         switch (cmdnum) {
1048         case 0:
1049                 /* Blank line */
1050                 break;
1051         case -1:
1052                 /* Unrecognized command */
1053                 err = -1;
1054                 break;
1055         case I_GET:
1056                 err = process_get(conn, path1, path2, *pwd, pflag);
1057                 break;
1058         case I_PUT:
1059                 err = process_put(conn, path1, path2, *pwd, pflag);
1060                 break;
1061         case I_RENAME:
1062                 path1 = make_absolute(path1, *pwd);
1063                 path2 = make_absolute(path2, *pwd);
1064                 err = do_rename(conn, path1, path2);
1065                 break;
1066         case I_SYMLINK:
1067                 path2 = make_absolute(path2, *pwd);
1068                 err = do_symlink(conn, path1, path2);
1069                 break;
1070         case I_RM:
1071                 path1 = make_absolute(path1, *pwd);
1072                 remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
1073                 for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
1074                         printf("Removing %s\n", g.gl_pathv[i]);
1075                         err = do_rm(conn, g.gl_pathv[i]);
1076                         if (err != 0 && err_abort)
1077                                 break;
1078                 }
1079                 break;
1080         case I_MKDIR:
1081                 path1 = make_absolute(path1, *pwd);
1082                 attrib_clear(&a);
1083                 a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
1084                 a.perm = 0777;
1085                 err = do_mkdir(conn, path1, &a);
1086                 break;
1087         case I_RMDIR:
1088                 path1 = make_absolute(path1, *pwd);
1089                 err = do_rmdir(conn, path1);
1090                 break;
1091         case I_CHDIR:
1092                 path1 = make_absolute(path1, *pwd);
1093                 if ((tmp = do_realpath(conn, path1)) == NULL) {
1094                         err = 1;
1095                         break;
1096                 }
1097                 if ((aa = do_stat(conn, tmp, 0)) == NULL) {
1098                         xfree(tmp);
1099                         err = 1;
1100                         break;
1101                 }
1102                 if (!(aa->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)) {
1103                         error("Can't change directory: Can't check target");
1104                         xfree(tmp);
1105                         err = 1;
1106                         break;
1107                 }
1108                 if (!S_ISDIR(aa->perm)) {
1109                         error("Can't change directory: \"%s\" is not "
1110                             "a directory", tmp);
1111                         xfree(tmp);
1112                         err = 1;
1113                         break;
1114                 }
1115                 xfree(*pwd);
1116                 *pwd = tmp;
1117                 break;
1118         case I_LS:
1119                 if (!path1) {
1120                         do_globbed_ls(conn, *pwd, *pwd, lflag);
1121                         break;
1122                 }
1123
1124                 /* Strip pwd off beginning of non-absolute paths */
1125                 tmp = NULL;
1126                 if (*path1 != '/')
1127                         tmp = *pwd;
1128
1129                 path1 = make_absolute(path1, *pwd);
1130                 err = do_globbed_ls(conn, path1, tmp, lflag);
1131                 break;
1132         case I_LCHDIR:
1133                 if (chdir(path1) == -1) {
1134                         error("Couldn't change local directory to "
1135                             "\"%s\": %s", path1, strerror(errno));
1136                         err = 1;
1137                 }
1138                 break;
1139         case I_LMKDIR:
1140                 if (mkdir(path1, 0777) == -1) {
1141                         error("Couldn't create local directory "
1142                             "\"%s\": %s", path1, strerror(errno));
1143                         err = 1;
1144                 }
1145                 break;
1146         case I_LLS:
1147                 local_do_ls(cmd);
1148                 break;
1149         case I_SHELL:
1150                 local_do_shell(cmd);
1151                 break;
1152         case I_LUMASK:
1153                 umask(n_arg);
1154                 printf("Local umask: %03lo\n", n_arg);
1155                 break;
1156         case I_CHMOD:
1157                 path1 = make_absolute(path1, *pwd);
1158                 attrib_clear(&a);
1159                 a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
1160                 a.perm = n_arg;
1161                 remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
1162                 for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
1163                         printf("Changing mode on %s\n", g.gl_pathv[i]);
1164                         err = do_setstat(conn, g.gl_pathv[i], &a);
1165                         if (err != 0 && err_abort)
1166                                 break;
1167                 }
1168                 break;
1169         case I_CHOWN:
1170         case I_CHGRP:
1171                 path1 = make_absolute(path1, *pwd);
1172                 remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
1173                 for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
1174                         if (!(aa = do_stat(conn, g.gl_pathv[i], 0))) {
1175                                 if (err != 0 && err_abort)
1176                                         break;
1177                                 else
1178                                         continue;
1179                         }
1180                         if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
1181                                 error("Can't get current ownership of "
1182                                     "remote file \"%s\"", g.gl_pathv[i]);
1183                                 if (err != 0 && err_abort)
1184                                         break;
1185                                 else
1186                                         continue;
1187                         }
1188                         aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
1189                         if (cmdnum == I_CHOWN) {
1190                                 printf("Changing owner on %s\n", g.gl_pathv[i]);
1191                                 aa->uid = n_arg;
1192                         } else {
1193                                 printf("Changing group on %s\n", g.gl_pathv[i]);
1194                                 aa->gid = n_arg;
1195                         }
1196                         err = do_setstat(conn, g.gl_pathv[i], aa);
1197                         if (err != 0 && err_abort)
1198                                 break;
1199                 }
1200                 break;
1201         case I_PWD:
1202                 printf("Remote working directory: %s\n", *pwd);
1203                 break;
1204         case I_LPWD:
1205                 if (!getcwd(path_buf, sizeof(path_buf))) {
1206                         error("Couldn't get local cwd: %s", strerror(errno));
1207                         err = -1;
1208                         break;
1209                 }
1210                 printf("Local working directory: %s\n", path_buf);
1211                 break;
1212         case I_QUIT:
1213                 /* Processed below */
1214                 break;
1215         case I_HELP:
1216                 help();
1217                 break;
1218         case I_VERSION:
1219                 printf("SFTP protocol version %u\n", sftp_proto_version(conn));
1220                 break;
1221         case I_PROGRESS:
1222                 showprogress = !showprogress;
1223                 if (showprogress)
1224                         printf("Progress meter enabled\n");
1225                 else
1226                         printf("Progress meter disabled\n");
1227                 break;
1228         default:
1229                 fatal("%d is not implemented", cmdnum);
1230         }
1231
1232         if (g.gl_pathc)
1233                 globfree(&g);
1234         if (path1)
1235                 xfree(path1);
1236         if (path2)
1237                 xfree(path2);
1238
1239         /* If an unignored error occurs in batch mode we should abort. */
1240         if (err_abort && err != 0)
1241                 return (-1);
1242         else if (cmdnum == I_QUIT)
1243                 return (1);
1244
1245         return (0);
1246 }
1247
1248 #ifdef USE_LIBEDIT
1249 static char *
1250 prompt(EditLine *el)
1251 {
1252         return ("sftp> ");
1253 }
1254 #endif
1255
1256 int
1257 interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
1258 {
1259         char *pwd;
1260         char *dir = NULL;
1261         char cmd[2048];
1262         struct sftp_conn *conn;
1263         int err, interactive;
1264         EditLine *el = NULL;
1265 #ifdef USE_LIBEDIT
1266         History *hl = NULL;
1267         HistEvent hev;
1268         extern char *__progname;
1269
1270         if (!batchmode && isatty(STDIN_FILENO)) {
1271                 if ((el = el_init(__progname, stdin, stdout, stderr)) == NULL)
1272                         fatal("Couldn't initialise editline");
1273                 if ((hl = history_init()) == NULL)
1274                         fatal("Couldn't initialise editline history");
1275                 history(hl, &hev, H_SETSIZE, 100);
1276                 el_set(el, EL_HIST, history, hl);
1277
1278                 el_set(el, EL_PROMPT, prompt);
1279                 el_set(el, EL_EDITOR, "emacs");
1280                 el_set(el, EL_TERMINAL, NULL);
1281                 el_set(el, EL_SIGNAL, 1);
1282                 el_source(el, NULL);
1283         }
1284 #endif /* USE_LIBEDIT */
1285
1286         conn = do_init(fd_in, fd_out, copy_buffer_len, num_requests);
1287         if (conn == NULL)
1288                 fatal("Couldn't initialise connection to server");
1289
1290         pwd = do_realpath(conn, ".");
1291         if (pwd == NULL)
1292                 fatal("Need cwd");
1293
1294         if (file1 != NULL) {
1295                 dir = xstrdup(file1);
1296                 dir = make_absolute(dir, pwd);
1297
1298                 if (remote_is_dir(conn, dir) && file2 == NULL) {
1299                         printf("Changing to: %s\n", dir);
1300                         snprintf(cmd, sizeof cmd, "cd \"%s\"", dir);
1301                         if (parse_dispatch_command(conn, cmd, &pwd, 1) != 0) {
1302                                 xfree(dir);
1303                                 xfree(pwd);
1304                                 xfree(conn);
1305                                 return (-1);
1306                         }
1307                 } else {
1308                         if (file2 == NULL)
1309                                 snprintf(cmd, sizeof cmd, "get %s", dir);
1310                         else
1311                                 snprintf(cmd, sizeof cmd, "get %s %s", dir,
1312                                     file2);
1313
1314                         err = parse_dispatch_command(conn, cmd, &pwd, 1);
1315                         xfree(dir);
1316                         xfree(pwd);
1317                         xfree(conn);
1318                         return (err);
1319                 }
1320                 xfree(dir);
1321         }
1322
1323 #if defined(HAVE_SETVBUF) && !defined(BROKEN_SETVBUF)
1324         setvbuf(stdout, NULL, _IOLBF, 0);
1325         setvbuf(infile, NULL, _IOLBF, 0);
1326 #else
1327         setlinebuf(stdout);
1328         setlinebuf(infile);
1329 #endif
1330
1331         interactive = !batchmode && isatty(STDIN_FILENO);
1332         err = 0;
1333         for (;;) {
1334                 char *cp;
1335
1336                 signal(SIGINT, SIG_IGN);
1337
1338                 if (el == NULL) {
1339                         if (interactive)
1340                                 printf("sftp> ");
1341                         if (fgets(cmd, sizeof(cmd), infile) == NULL) {
1342                                 if (interactive)
1343                                         printf("\n");
1344                                 break;
1345                         }
1346                         if (!interactive) { /* Echo command */
1347                                 printf("sftp> %s", cmd);
1348                                 if (strlen(cmd) > 0 &&
1349                                     cmd[strlen(cmd) - 1] != '\n')
1350                                         printf("\n");
1351                         }
1352                 } else {
1353 #ifdef USE_LIBEDIT
1354                         const char *line;
1355                         int count = 0;
1356
1357                         if ((line = el_gets(el, &count)) == NULL || count <= 0) {
1358                                 printf("\n");
1359                                 break;
1360                         }
1361                         history(hl, &hev, H_ENTER, line);
1362                         if (strlcpy(cmd, line, sizeof(cmd)) >= sizeof(cmd)) {
1363                                 fprintf(stderr, "Error: input line too long\n");
1364                                 continue;
1365                         }
1366 #endif /* USE_LIBEDIT */
1367                 }
1368
1369                 cp = strrchr(cmd, '\n');
1370                 if (cp)
1371                         *cp = '\0';
1372
1373                 /* Handle user interrupts gracefully during commands */
1374                 interrupted = 0;
1375                 signal(SIGINT, cmd_interrupt);
1376
1377                 err = parse_dispatch_command(conn, cmd, &pwd, batchmode);
1378                 if (err != 0)
1379                         break;
1380         }
1381         xfree(pwd);
1382         xfree(conn);
1383
1384 #ifdef USE_LIBEDIT
1385         if (el != NULL)
1386                 el_end(el);
1387 #endif /* USE_LIBEDIT */
1388
1389         /* err == 1 signifies normal "quit" exit */
1390         return (err >= 0 ? 0 : -1);
1391 }
1392
1393 static void
1394 connect_to_server(char *path, char **args, int *in, int *out)
1395 {
1396         int c_in, c_out;
1397
1398 #ifdef USE_PIPES
1399         int pin[2], pout[2];
1400
1401         if ((pipe(pin) == -1) || (pipe(pout) == -1))
1402                 fatal("pipe: %s", strerror(errno));
1403         *in = pin[0];
1404         *out = pout[1];
1405         c_in = pout[0];
1406         c_out = pin[1];
1407 #else /* USE_PIPES */
1408         int inout[2];
1409
1410         if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1)
1411                 fatal("socketpair: %s", strerror(errno));
1412         *in = *out = inout[0];
1413         c_in = c_out = inout[1];
1414 #endif /* USE_PIPES */
1415
1416         if ((sshpid = fork()) == -1)
1417                 fatal("fork: %s", strerror(errno));
1418         else if (sshpid == 0) {
1419                 if ((dup2(c_in, STDIN_FILENO) == -1) ||
1420                     (dup2(c_out, STDOUT_FILENO) == -1)) {
1421                         fprintf(stderr, "dup2: %s\n", strerror(errno));
1422                         _exit(1);
1423                 }
1424                 close(*in);
1425                 close(*out);
1426                 close(c_in);
1427                 close(c_out);
1428
1429                 /*
1430                  * The underlying ssh is in the same process group, so we must
1431                  * ignore SIGINT if we want to gracefully abort commands,
1432                  * otherwise the signal will make it to the ssh process and
1433                  * kill it too
1434                  */
1435                 signal(SIGINT, SIG_IGN);
1436                 execvp(path, args);
1437                 fprintf(stderr, "exec: %s: %s\n", path, strerror(errno));
1438                 _exit(1);
1439         }
1440
1441         signal(SIGTERM, killchild);
1442         signal(SIGINT, killchild);
1443         signal(SIGHUP, killchild);
1444         close(c_in);
1445         close(c_out);
1446 }
1447
1448 static void
1449 usage(void)
1450 {
1451         extern char *__progname;
1452
1453         fprintf(stderr,
1454             "usage: %s [-1Cv] [-B buffer_size] [-b batchfile] [-F ssh_config]\n"
1455             "            [-o ssh_option] [-P sftp_server_path] [-R num_requests]\n"
1456             "            [-S program] [-s subsystem | sftp_server] host\n"
1457             "       %s [[user@]host[:file [file]]]\n"
1458             "       %s [[user@]host[:dir[/]]]\n"
1459             "       %s -b batchfile [user@]host\n", __progname, __progname, __progname, __progname);
1460         exit(1);
1461 }
1462
1463 int
1464 main(int argc, char **argv)
1465 {
1466         int in, out, ch, err;
1467         char *host, *userhost, *cp, *file2 = NULL;
1468         int debug_level = 0, sshver = 2;
1469         char *file1 = NULL, *sftp_server = NULL;
1470         char *ssh_program = _PATH_SSH_PROGRAM, *sftp_direct = NULL;
1471         LogLevel ll = SYSLOG_LEVEL_INFO;
1472         arglist args;
1473         extern int optind;
1474         extern char *optarg;
1475
1476         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1477         sanitise_stdfd();
1478
1479         __progname = ssh_get_progname(argv[0]);
1480         memset(&args, '\0', sizeof(args));
1481         args.list = NULL;
1482         addargs(&args, "%s", ssh_program);
1483         addargs(&args, "-oForwardX11 no");
1484         addargs(&args, "-oForwardAgent no");
1485         addargs(&args, "-oPermitLocalCommand no");
1486         addargs(&args, "-oClearAllForwardings yes");
1487
1488         ll = SYSLOG_LEVEL_INFO;
1489         infile = stdin;
1490
1491         while ((ch = getopt(argc, argv, "1hvCo:s:S:b:B:F:P:R:")) != -1) {
1492                 switch (ch) {
1493                 case 'C':
1494                         addargs(&args, "-C");
1495                         break;
1496                 case 'v':
1497                         if (debug_level < 3) {
1498                                 addargs(&args, "-v");
1499                                 ll = SYSLOG_LEVEL_DEBUG1 + debug_level;
1500                         }
1501                         debug_level++;
1502                         break;
1503                 case 'F':
1504                 case 'o':
1505                         addargs(&args, "-%c%s", ch, optarg);
1506                         break;
1507                 case '1':
1508                         sshver = 1;
1509                         if (sftp_server == NULL)
1510                                 sftp_server = _PATH_SFTP_SERVER;
1511                         break;
1512                 case 's':
1513                         sftp_server = optarg;
1514                         break;
1515                 case 'S':
1516                         ssh_program = optarg;
1517                         replacearg(&args, 0, "%s", ssh_program);
1518                         break;
1519                 case 'b':
1520                         if (batchmode)
1521                                 fatal("Batch file already specified.");
1522
1523                         /* Allow "-" as stdin */
1524                         if (strcmp(optarg, "-") != 0 &&
1525                             (infile = fopen(optarg, "r")) == NULL)
1526                                 fatal("%s (%s).", strerror(errno), optarg);
1527                         showprogress = 0;
1528                         batchmode = 1;
1529                         addargs(&args, "-obatchmode yes");
1530                         break;
1531                 case 'P':
1532                         sftp_direct = optarg;
1533                         break;
1534                 case 'B':
1535                         copy_buffer_len = strtol(optarg, &cp, 10);
1536                         if (copy_buffer_len == 0 || *cp != '\0')
1537                                 fatal("Invalid buffer size \"%s\"", optarg);
1538                         break;
1539                 case 'R':
1540                         num_requests = strtol(optarg, &cp, 10);
1541                         if (num_requests == 0 || *cp != '\0')
1542                                 fatal("Invalid number of requests \"%s\"",
1543                                     optarg);
1544                         break;
1545                 case 'h':
1546                 default:
1547                         usage();
1548                 }
1549         }
1550
1551         if (!isatty(STDERR_FILENO))
1552                 showprogress = 0;
1553
1554         log_init(argv[0], ll, SYSLOG_FACILITY_USER, 1);
1555
1556         if (sftp_direct == NULL) {
1557                 if (optind == argc || argc > (optind + 2))
1558                         usage();
1559
1560                 userhost = xstrdup(argv[optind]);
1561                 file2 = argv[optind+1];
1562
1563                 if ((host = strrchr(userhost, '@')) == NULL)
1564                         host = userhost;
1565                 else {
1566                         *host++ = '\0';
1567                         if (!userhost[0]) {
1568                                 fprintf(stderr, "Missing username\n");
1569                                 usage();
1570                         }
1571                         addargs(&args, "-l%s", userhost);
1572                 }
1573
1574                 if ((cp = colon(host)) != NULL) {
1575                         *cp++ = '\0';
1576                         file1 = cp;
1577                 }
1578
1579                 host = cleanhostname(host);
1580                 if (!*host) {
1581                         fprintf(stderr, "Missing hostname\n");
1582                         usage();
1583                 }
1584
1585                 addargs(&args, "-oProtocol %d", sshver);
1586
1587                 /* no subsystem if the server-spec contains a '/' */
1588                 if (sftp_server == NULL || strchr(sftp_server, '/') == NULL)
1589                         addargs(&args, "-s");
1590
1591                 addargs(&args, "%s", host);
1592                 addargs(&args, "%s", (sftp_server != NULL ?
1593                     sftp_server : "sftp"));
1594
1595                 if (!batchmode)
1596                         fprintf(stderr, "Connecting to %s...\n", host);
1597                 connect_to_server(ssh_program, args.list, &in, &out);
1598         } else {
1599                 args.list = NULL;
1600                 addargs(&args, "sftp-server");
1601
1602                 if (!batchmode)
1603                         fprintf(stderr, "Attaching to %s...\n", sftp_direct);
1604                 connect_to_server(sftp_direct, args.list, &in, &out);
1605         }
1606         freeargs(&args);
1607
1608         err = interactive_loop(in, out, file1, file2);
1609
1610 #if !defined(USE_PIPES)
1611         shutdown(in, SHUT_RDWR);
1612         shutdown(out, SHUT_RDWR);
1613 #endif
1614
1615         close(in);
1616         close(out);
1617         if (batchmode)
1618                 fclose(infile);
1619
1620         while (waitpid(sshpid, NULL, 0) == -1)
1621                 if (errno != EINTR)
1622                         fatal("Couldn't wait for ssh process: %s",
1623                             strerror(errno));
1624
1625         exit(err == 0 ? 0 : 1);
1626 }