git.distorted.org.uk Git - u/mdw/putty/blob - unix/uxsftp.c

   1 /*
   2  * uxsftp.c: the Unix-specific parts of PSFTP and PSCP.
   3  */
   4
   5 #include <sys/time.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <stdlib.h>
   9 #include <fcntl.h>
  10 #include <dirent.h>
  11 #include <unistd.h>
  12 #include <utime.h>
  13 #include <errno.h>
  14 #include <assert.h>
  15
  16 #include "putty.h"
  17 #include "psftp.h"
  18
  19 /*
  20  * In PSFTP our selects are synchronous, so these functions are
  21  * empty stubs.
  22  */
  23 int uxsel_input_add(int fd, int rwx) { return 0; }
  24 void uxsel_input_remove(int id) { }
  25
  26 char *x_get_default(const char *key)
  27 {
  28     return NULL;                       /* this is a stub */
  29 }
  30
  31 void platform_get_x11_auth(char *display, int *protocol,
  32                            unsigned char *data, int *datalen)
  33 {
  34     /* Do nothing, therefore no auth. */
  35 }
  36
  37 /*
  38  * Default settings that are specific to PSFTP.
  39  */
  40 char *platform_default_s(const char *name)
  41 {
  42     return NULL;
  43 }
  44
  45 int platform_default_i(const char *name, int def)
  46 {
  47     return def;
  48 }
  49
  50 FontSpec platform_default_fontspec(const char *name)
  51 {
  52     FontSpec ret;
  53     *ret.name = '\0';
  54     return ret;
  55 }
  56
  57 Filename platform_default_filename(const char *name)
  58 {
  59     Filename ret;
  60     if (!strcmp(name, "LogFileName"))
  61         strcpy(ret.path, "putty.log");
  62     else
  63         *ret.path = '\0';
  64     return ret;
  65 }
  66
  67 /*
  68  * Stubs for the GUI feedback mechanism in Windows PSCP.
  69  */
  70 void gui_update_stats(char *name, unsigned long size,
  71                       int percentage, unsigned long elapsed,
  72                       unsigned long done, unsigned long eta,
  73                       unsigned long ratebs) {}
  74 void gui_send_errcount(int list, int errs) {}
  75 void gui_send_char(int is_stderr, int c) {}
  76 void gui_enable(char *arg) {}
  77
  78
  79 /*
  80  * Set local current directory. Returns NULL on success, or else an
  81  * error message which must be freed after printing.
  82  */
  83 char *psftp_lcd(char *dir)
  84 {
  85     if (chdir(dir) < 0)
  86         return dupprintf("%s: chdir: %s", dir, strerror(errno));
  87     else
  88         return NULL;
  89 }
  90
  91 /*
  92  * Get local current directory. Returns a string which must be
  93  * freed.
  94  */
  95 char *psftp_getcwd(void)
  96 {
  97     char *buffer, *ret;
  98     int size = 256;
  99
 100     buffer = snewn(size, char);
 101     while (1) {
 102         ret = getcwd(buffer, size);
 103         if (ret != NULL)
 104             return ret;
 105         if (errno != ERANGE) {
 106             sfree(buffer);
 107             return dupprintf("[cwd unavailable: %s]", strerror(errno));
 108         }
 109         /*
 110          * Otherwise, ERANGE was returned, meaning the buffer
 111          * wasn't big enough.
 112          */
 113         size = size * 3 / 2;
 114         buffer = sresize(buffer, size, char);
 115     }
 116 }
 117
 118 struct RFile {
 119     int fd;
 120 };
 121
 122 RFile *open_existing_file(char *name, unsigned long *size,
 123                           unsigned long *mtime, unsigned long *atime)
 124 {
 125     int fd;
 126     RFile *ret;
 127
 128     fd = open(name, O_RDONLY);
 129     if (fd < 0)
 130         return NULL;
 131
 132     ret = snew(RFile);
 133     ret->fd = fd;
 134
 135     if (size || mtime || atime) {
 136         struct stat statbuf;
 137         if (fstat(fd, &statbuf) < 0) {
 138             fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
 139             memset(&statbuf, 0, sizeof(statbuf));
 140         }
 141
 142         if (size)
 143             *size = statbuf.st_size;
 144
 145         if (mtime)
 146             *mtime = statbuf.st_mtime;
 147
 148         if (atime)
 149             *atime = statbuf.st_atime;
 150     }
 151
 152     return ret;
 153 }
 154
 155 int read_from_file(RFile *f, void *buffer, int length)
 156 {
 157     return read(f->fd, buffer, length);
 158 }
 159
 160 void close_rfile(RFile *f)
 161 {
 162     close(f->fd);
 163     sfree(f);
 164 }
 165
 166 struct WFile {
 167     int fd;
 168     char *name;
 169 };
 170
 171 WFile *open_new_file(char *name)
 172 {
 173     int fd;
 174     WFile *ret;
 175
 176     fd = open(name, O_CREAT | O_TRUNC | O_WRONLY, 0666);
 177     if (fd < 0)
 178         return NULL;
 179
 180     ret = snew(WFile);
 181     ret->fd = fd;
 182     ret->name = dupstr(name);
 183
 184     return ret;
 185 }
 186
 187 int write_to_file(WFile *f, void *buffer, int length)
 188 {
 189     char *p = (char *)buffer;
 190     int so_far = 0;
 191
 192     /* Keep trying until we've really written as much as we can. */
 193     while (length > 0) {
 194         int ret = write(f->fd, p, length);
 195
 196         if (ret < 0)
 197             return ret;
 198
 199         if (ret == 0)
 200             break;
 201
 202         p += ret;
 203         length -= ret;
 204         so_far += ret;
 205     }
 206
 207     return so_far;
 208 }
 209
 210 void set_file_times(WFile *f, unsigned long mtime, unsigned long atime)
 211 {
 212     struct utimbuf ut;
 213
 214     ut.actime = atime;
 215     ut.modtime = mtime;
 216
 217     utime(f->name, &ut);
 218 }
 219
 220 /* Closes and frees the WFile */
 221 void close_wfile(WFile *f)
 222 {
 223     close(f->fd);
 224     sfree(f->name);
 225     sfree(f);
 226 }
 227
 228 int file_type(char *name)
 229 {
 230     struct stat statbuf;
 231
 232     if (stat(name, &statbuf) < 0) {
 233         if (errno != ENOENT)
 234             fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
 235         return FILE_TYPE_NONEXISTENT;
 236     }
 237
 238     if (S_ISREG(statbuf.st_mode))
 239         return FILE_TYPE_FILE;
 240
 241     if (S_ISDIR(statbuf.st_mode))
 242         return FILE_TYPE_DIRECTORY;
 243
 244     return FILE_TYPE_WEIRD;
 245 }
 246
 247 struct DirHandle {
 248     DIR *dir;
 249 };
 250
 251 DirHandle *open_directory(char *name)
 252 {
 253     DIR *dir;
 254     DirHandle *ret;
 255
 256     dir = opendir(name);
 257     if (!dir)
 258         return NULL;
 259
 260     ret = snew(DirHandle);
 261     ret->dir = dir;
 262     return ret;
 263 }
 264
 265 char *read_filename(DirHandle *dir)
 266 {
 267     struct dirent *de;
 268
 269     do {
 270         de = readdir(dir->dir);
 271         if (de == NULL)
 272             return NULL;
 273     } while ((de->d_name[0] == '.' &&
 274               (de->d_name[1] == '\0' ||
 275                (de->d_name[1] == '.' && de->d_name[2] == '\0'))));
 276
 277     return dupstr(de->d_name);
 278 }
 279
 280 void close_directory(DirHandle *dir)
 281 {
 282     closedir(dir->dir);
 283     sfree(dir);
 284 }
 285
 286 int test_wildcard(char *name, int cmdline)
 287 {
 288     /*
 289      * On Unix, we currently don't support local wildcards at all.
 290      * We will have to do so (FIXME) once PSFTP starts implementing
 291      * mput, but until then we can assume `cmdline' is always set.
 292      */
 293     struct stat statbuf;
 294
 295     assert(cmdline);
 296     if (stat(name, &statbuf) < 0)
 297         return WCTYPE_NONEXISTENT;
 298     else
 299         return WCTYPE_FILENAME;
 300 }
 301
 302 /*
 303  * Actually return matching file names for a local wildcard. FIXME:
 304  * we currently don't support this at all.
 305  */
 306 struct WildcardMatcher {
 307     int x;
 308 };
 309 WildcardMatcher *begin_wildcard_matching(char *name) { return NULL; }
 310 char *wildcard_get_filename(WildcardMatcher *dir) { return NULL; }
 311 void finish_wildcard_matching(WildcardMatcher *dir) {}
 312
 313 int create_directory(char *name)
 314 {
 315     return mkdir(name, 0777) == 0;
 316 }
 317
 318 char *dir_file_cat(char *dir, char *file)
 319 {
 320     return dupcat(dir, "/", file, NULL);
 321 }
 322
 323 /*
 324  * Do a select() between all currently active network fds and
 325  * optionally stdin.
 326  */
 327 static int ssh_sftp_do_select(int include_stdin)
 328 {
 329     fd_set rset, wset, xset;
 330     int i, fdcount, fdsize, *fdlist;
 331     int fd, fdstate, rwx, ret, maxfd;
 332     long now = GETTICKCOUNT();
 333
 334     fdlist = NULL;
 335     fdcount = fdsize = 0;
 336
 337     do {
 338
 339         /* Count the currently active fds. */
 340         i = 0;
 341         for (fd = first_fd(&fdstate, &rwx); fd >= 0;
 342              fd = next_fd(&fdstate, &rwx)) i++;
 343
 344         if (i < 1)
 345             return -1;                 /* doom */
 346
 347         /* Expand the fdlist buffer if necessary. */
 348         if (i > fdsize) {
 349             fdsize = i + 16;
 350             fdlist = sresize(fdlist, fdsize, int);
 351         }
 352
 353         FD_ZERO(&rset);
 354         FD_ZERO(&wset);
 355         FD_ZERO(&xset);
 356         maxfd = 0;
 357
 358         /*
 359          * Add all currently open fds to the select sets, and store
 360          * them in fdlist as well.
 361          */
 362         fdcount = 0;
 363         for (fd = first_fd(&fdstate, &rwx); fd >= 0;
 364              fd = next_fd(&fdstate, &rwx)) {
 365             fdlist[fdcount++] = fd;
 366             if (rwx & 1)
 367                 FD_SET_MAX(fd, maxfd, rset);
 368             if (rwx & 2)
 369                 FD_SET_MAX(fd, maxfd, wset);
 370             if (rwx & 4)
 371                 FD_SET_MAX(fd, maxfd, xset);
 372         }
 373
 374         if (include_stdin)
 375             FD_SET_MAX(0, maxfd, rset);
 376
 377         do {
 378             long next, ticks;
 379             struct timeval tv, *ptv;
 380
 381             if (run_timers(now, &next)) {
 382                 ticks = next - GETTICKCOUNT();
 383                 if (ticks <= 0)
 384                     ticks = 1;         /* just in case */
 385                 tv.tv_sec = ticks / 1000;
 386                 tv.tv_usec = ticks % 1000 * 1000;
 387                 ptv = &tv;
 388             } else {
 389                 ptv = NULL;
 390             }
 391             ret = select(maxfd, &rset, &wset, &xset, ptv);
 392             if (ret == 0)
 393                 now = next;
 394             else
 395                 now = GETTICKCOUNT();
 396         } while (ret < 0 && errno != EINTR);
 397     } while (ret == 0);
 398
 399     if (ret < 0) {
 400         perror("select");
 401         exit(1);
 402     }
 403
 404     for (i = 0; i < fdcount; i++) {
 405         fd = fdlist[i];
 406         /*
 407          * We must process exceptional notifications before
 408          * ordinary readability ones, or we may go straight
 409          * past the urgent marker.
 410          */
 411         if (FD_ISSET(fd, &xset))
 412             select_result(fd, 4);
 413         if (FD_ISSET(fd, &rset))
 414             select_result(fd, 1);
 415         if (FD_ISSET(fd, &wset))
 416             select_result(fd, 2);
 417     }
 418
 419     sfree(fdlist);
 420
 421     return FD_ISSET(0, &rset) ? 1 : 0;
 422 }
 423
 424 /*
 425  * Wait for some network data and process it.
 426  */
 427 int ssh_sftp_loop_iteration(void)
 428 {
 429     return ssh_sftp_do_select(FALSE);
 430 }
 431
 432 /*
 433  * Read a PSFTP command line from stdin.
 434  */
 435 char *ssh_sftp_get_cmdline(char *prompt)
 436 {
 437     char *buf;
 438     int buflen, bufsize, ret;
 439
 440     fputs(prompt, stdout);
 441     fflush(stdout);
 442
 443     buf = NULL;
 444     buflen = bufsize = 0;
 445
 446     while (1) {
 447         ret = ssh_sftp_do_select(TRUE);
 448         if (ret < 0) {
 449             printf("connection died\n");
 450             return NULL;               /* woop woop */
 451         }
 452         if (ret > 0) {
 453             if (buflen >= bufsize) {
 454                 bufsize = buflen + 512;
 455                 buf = sresize(buf, bufsize, char);
 456             }
 457             ret = read(0, buf+buflen, 1);
 458             if (ret < 0) {
 459                 perror("read");
 460                 return NULL;
 461             }
 462             if (ret == 0) {
 463                 /* eof on stdin; no error, but no answer either */
 464                 return NULL;
 465             }
 466
 467             if (buf[buflen++] == '\n') {
 468                 /* we have a full line */
 469                 return buf;
 470             }
 471         }
 472     }
 473 }
 474
 475 /*
 476  * Main program: do platform-specific initialisation and then call
 477  * psftp_main().
 478  */
 479 int main(int argc, char *argv[])
 480 {
 481     uxsel_init();
 482     return psftp_main(argc, argv);
 483 }