networking/wget.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * wget - retrieve a file using HTTP or FTP
   4  *
   5  * Chip Rosenthal Covad Communications <chip@laserlink.net>
   6  *
   7  */
   8
   9 #include <stdio.h>
  10 #include <errno.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <ctype.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16 #include <signal.h>
  17 #include <sys/ioctl.h>
  18
  19 #include <sys/time.h>
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <arpa/inet.h>
  25 #include <netdb.h>
  26
  27 #ifndef _GNU_SOURCE
  28 #define _GNU_SOURCE
  29 #endif
  30 #include <getopt.h>
  31
  32 #include "busybox.h"
  33
  34 struct host_info {
  35         char *host;
  36         int port;
  37         char *path;
  38         int is_ftp;
  39         char *user;
  40 };
  41
  42 static void parse_url(char *url, struct host_info *h);
  43 static FILE *open_socket(char *host, int port);
  44 static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc);
  45 static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf);
  46
  47 /* Globals (can be accessed from signal handlers */
  48 static off_t filesize = 0;              /* content-length of the file */
  49 static int chunked = 0;                 /* chunked transfer encoding */
  50 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
  51 static void progressmeter(int flag);
  52 static char *curfile;                   /* Name of current file being transferred. */
  53 static struct timeval start;    /* Time a transfer started. */
  54 static volatile unsigned long statbytes = 0; /* Number of bytes transferred so far. */
  55 /* For progressmeter() -- number of seconds before xfer considered "stalled" */
  56 static const int STALLTIME = 5;
  57 #endif
  58
  59 static void close_and_delete_outfile(FILE* output, char *fname_out, int do_continue)
  60 {
  61         if (output != stdout && do_continue==0) {
  62                 fclose(output);
  63                 unlink(fname_out);
  64         }
  65 }
  66
  67 /* Read NMEMB elements of SIZE bytes into PTR from STREAM.  Returns the
  68  * number of elements read, and a short count if an eof or non-interrupt
  69  * error is encountered.  */
  70 static size_t safe_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
  71 {
  72         size_t ret = 0;
  73
  74         do {
  75                 clearerr(stream);
  76                 ret += fread((char *)ptr + (ret * size), size, nmemb - ret, stream);
  77         } while (ret < nmemb && ferror(stream) && errno == EINTR);
  78
  79         return ret;
  80 }
  81
  82 /* Write NMEMB elements of SIZE bytes from PTR to STREAM.  Returns the
  83  * number of elements written, and a short count if an eof or non-interrupt
  84  * error is encountered.  */
  85 static size_t safe_fwrite(void *ptr, size_t size, size_t nmemb, FILE *stream)
  86 {
  87         size_t ret = 0;
  88
  89         do {
  90                 clearerr(stream);
  91                 ret += fwrite((char *)ptr + (ret * size), size, nmemb - ret, stream);
  92         } while (ret < nmemb && ferror(stream) && errno == EINTR);
  93
  94         return ret;
  95 }
  96
  97 /* Read a line or SIZE - 1 bytes into S, whichever is less, from STREAM.
  98  * Returns S, or NULL if an eof or non-interrupt error is encountered.  */
  99 static char *safe_fgets(char *s, int size, FILE *stream)
 100 {
 101         char *ret;
 102
 103         do {
 104                 clearerr(stream);
 105                 ret = fgets(s, size, stream);
 106         } while (ret == NULL && ferror(stream) && errno == EINTR);
 107
 108         return ret;
 109 }
 110
 111 #define close_delete_and_die(s...) { \
 112         close_and_delete_outfile(output, fname_out, do_continue); \
 113         bb_error_msg_and_die(s); }
 114
 115
 116 #ifdef CONFIG_FEATURE_WGET_AUTHENTICATION
 117 /*
 118  *  Base64-encode character string
 119  *  oops... isn't something similar in uuencode.c?
 120  *  It would be better to use already existing code
 121  */
 122 char *base64enc(char *p, char *buf, int len) {
 123
 124         char al[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
 125                     "0123456789+/";
 126                 char *s = buf;
 127
 128         while(*p) {
 129                                 if (s >= buf+len-4)
 130                                         bb_error_msg_and_die("buffer overflow");
 131                 *(s++) = al[(*p >> 2) & 0x3F];
 132                 *(s++) = al[((*p << 4) & 0x30) | ((*(p+1) >> 4) & 0x0F)];
 133                 *s = *(s+1) = '=';
 134                 *(s+2) = 0;
 135                 if (! *(++p)) break;
 136                 *(s++) = al[((*p << 2) & 0x3C) | ((*(p+1) >> 6) & 0x03)];
 137                 if (! *(++p)) break;
 138                 *(s++) = al[*(p++) & 0x3F];
 139         }
 140
 141                 return buf;
 142 }
 143 #endif
 144
 145 int wget_main(int argc, char **argv)
 146 {
 147         int n, try=5, status;
 148         int port;
 149         char *proxy = 0;
 150         char *dir_prefix=NULL;
 151         char *s, buf[512];
 152         struct stat sbuf;
 153         char extra_headers[1024];
 154         char *extra_headers_ptr = extra_headers;
 155         int extra_headers_left = sizeof(extra_headers);
 156         int which_long_opt = 0, option_index = -1;
 157         struct host_info server, target;
 158
 159         FILE *sfp = NULL;                       /* socket to web/ftp server                     */
 160         FILE *dfp = NULL;                       /* socket to ftp server (data)          */
 161         char *fname_out = NULL;         /* where to direct output (-O)          */
 162         int do_continue = 0;            /* continue a prev transfer (-c)        */
 163         long beg_range = 0L;            /*   range at which continue begins     */
 164         int got_clen = 0;                       /* got content-length: from server      */
 165         FILE *output;                           /* socket to web server                         */
 166         int quiet_flag = FALSE;         /* Be verry, verry quiet...                     */
 167         int noproxy = 0;            /* Use proxies if env vars are set  */
 168
 169 #define LONG_HEADER    1
 170 #define LONG_PASSIVE   2
 171
 172         struct option long_options[] = {
 173                 { "continue",        0, NULL, 'c' },
 174                 { "quiet",           0, NULL, 'q' },
 175                 { "output-document", 1, NULL, 'O' },
 176                 { "header",              1, &which_long_opt, LONG_HEADER },
 177                 { "proxy",           1, NULL, 'Y' },
 178                 { "passive-ftp",     0, &which_long_opt, LONG_PASSIVE },
 179                 { 0,                 0, 0, 0 }
 180         };
 181         /*
 182          * Crack command line.
 183          */
 184         while ((n = getopt_long(argc, argv, "cqO:P:Y:", long_options, &option_index)) != EOF) {
 185                 switch (n) {
 186                 case 'c':
 187                         ++do_continue;
 188                         break;
 189                 case 'P':
 190                         dir_prefix = optarg;
 191                         break;
 192                 case 'q':
 193                         quiet_flag = TRUE;
 194                         break;
 195                 case 'O':
 196                         /* can't set fname_out to NULL if outputting to stdout, because
 197                          * this gets interpreted as the auto-gen output filename
 198                          * case below  - tausq@debian.org
 199                          */
 200                         fname_out = optarg;
 201                         break;
 202                 case 'Y':
 203                         if (strcmp(optarg, "off") == 0)
 204                                 noproxy=1;
 205                         break;
 206                 case 0:
 207                         switch (which_long_opt) {
 208                                 case LONG_HEADER: {
 209                                         int arglen = strlen(optarg);
 210                                         if(extra_headers_left - arglen - 2 <= 0)
 211                                                 bb_error_msg_and_die("extra_headers buffer too small(need %i)", extra_headers_left - arglen);
 212                                         strcpy(extra_headers_ptr, optarg);
 213                                         extra_headers_ptr += arglen;
 214                                         extra_headers_left -= ( arglen + 2 );
 215                                         *extra_headers_ptr++ = '\r';
 216                                         *extra_headers_ptr++ = '\n';
 217                                         *(extra_headers_ptr + 1) = 0;
 218                                         break;
 219                                 }
 220                                 case LONG_PASSIVE:
 221                                         // ignore -- we always use passive mode
 222                                         break;
 223                         }
 224                         break;
 225                 default:
 226                         bb_show_usage();
 227                 }
 228         }
 229
 230         if (argc - optind != 1)
 231                         bb_show_usage();
 232
 233         parse_url(argv[optind], &target);
 234         server.host = target.host;
 235         server.port = target.port;
 236
 237         /*
 238          * Use the proxy if necessary.
 239          */
 240         if (!noproxy) {
 241                 proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
 242                 if (proxy)
 243                         parse_url(bb_xstrdup(proxy), &server);
 244         }
 245
 246         /* Guess an output filename */
 247         if (!fname_out) {
 248                 fname_out =
 249 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
 250                         curfile =
 251 #endif
 252                         bb_get_last_path_component(target.path);
 253                 if (fname_out==NULL || strlen(fname_out)<1) {
 254                         fname_out =
 255 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
 256                                 curfile =
 257 #endif
 258                                 "index.html";
 259                 }
 260                 if (dir_prefix != NULL)
 261                         fname_out = concat_path_file(dir_prefix, fname_out);
 262 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
 263         } else {
 264                 curfile = bb_get_last_path_component(fname_out);
 265 #endif
 266         }
 267         if (do_continue && !fname_out)
 268                 bb_error_msg_and_die("cannot specify continue (-c) without a filename (-O)");
 269
 270
 271         /*
 272          * Open the output file stream.
 273          */
 274         if (strcmp(fname_out, "-") == 0) {
 275                 output = stdout;
 276                 quiet_flag = TRUE;
 277         } else {
 278                 output = bb_xfopen(fname_out, (do_continue ? "a" : "w"));
 279         }
 280
 281         /*
 282          * Determine where to start transfer.
 283          */
 284         if (do_continue) {
 285                 if (fstat(fileno(output), &sbuf) < 0)
 286                         bb_perror_msg_and_die("fstat()");
 287                 if (sbuf.st_size > 0)
 288                         beg_range = sbuf.st_size;
 289                 else
 290                         do_continue = 0;
 291         }
 292
 293         if (proxy || !target.is_ftp) {
 294                 /*
 295                  *  HTTP session
 296                  */
 297                 do {
 298                         got_clen = chunked = 0;
 299
 300                         if (! --try)
 301                                 close_delete_and_die("too many redirections");
 302
 303                         /*
 304                          * Open socket to http server
 305                          */
 306                         if (sfp) fclose(sfp);
 307                         sfp = open_socket(server.host, server.port);
 308
 309                         /*
 310                          * Send HTTP request.
 311                          */
 312                         if (proxy) {
 313                                 const char *format = "GET %stp://%s:%d/%s HTTP/1.1\r\n";
 314 #ifdef CONFIG_FEATURE_WGET_IP6_LITERAL
 315                                 if (strchr (target.host, ':'))
 316                                         format = "GET %stp://[%s]:%d/%s HTTP/1.1\r\n";
 317 #endif
 318                                 fprintf(sfp, format,
 319                                         target.is_ftp ? "f" : "ht", target.host,
 320                                         target.port, target.path);
 321                         } else {
 322                                 fprintf(sfp, "GET /%s HTTP/1.1\r\n", target.path);
 323                         }
 324
 325                         fprintf(sfp, "Host: %s\r\nUser-Agent: Wget\r\n", target.host);
 326
 327 #ifdef CONFIG_FEATURE_WGET_AUTHENTICATION
 328                         if (target.user) {
 329                                 fprintf(sfp, "Authorization: Basic %s\r\n",
 330                                         base64enc(target.user, buf, sizeof(buf)));
 331                         }
 332                         if (proxy && server.user) {
 333                                 fprintf(sfp, "Proxy-Authorization: Basic %s\r\n",
 334                                         base64enc(server.user, buf, sizeof(buf)));
 335                         }
 336 #endif
 337
 338                         if (do_continue)
 339                                 fprintf(sfp, "Range: bytes=%ld-\r\n", beg_range);
 340                         if(extra_headers_left < sizeof(extra_headers))
 341                                 fputs(extra_headers,sfp);
 342                         fprintf(sfp,"Connection: close\r\n\r\n");
 343
 344                         /*
 345                         * Retrieve HTTP response line and check for "200" status code.
 346                         */
 347 read_response:
 348                         if (fgets(buf, sizeof(buf), sfp) == NULL)
 349                                 close_delete_and_die("no response from server");
 350
 351                         for (s = buf ; *s != '\0' && !isspace(*s) ; ++s)
 352                         ;
 353                         for ( ; isspace(*s) ; ++s)
 354                         ;
 355                         switch (status = atoi(s)) {
 356                                 case 0:
 357                                 case 100:
 358                                         while (gethdr(buf, sizeof(buf), sfp, &n) != NULL);
 359                                         goto read_response;
 360                                 case 200:
 361                                         if (do_continue && output != stdout)
 362                                                 output = freopen(fname_out, "w", output);
 363                                         do_continue = 0;
 364                                         break;
 365                                 case 300:       /* redirection */
 366                                 case 301:
 367                                 case 302:
 368                                 case 303:
 369                                         break;
 370                                 case 206:
 371                                         if (do_continue)
 372                                                 break;
 373                                         /*FALLTHRU*/
 374                                 default:
 375                                         chomp(buf);
 376                                         close_delete_and_die("server returned error %d: %s", atoi(s), buf);
 377                         }
 378
 379                         /*
 380                          * Retrieve HTTP headers.
 381                          */
 382                         while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) {
 383                                 if (strcasecmp(buf, "content-length") == 0) {
 384                                         filesize = atol(s);
 385                                         got_clen = 1;
 386                                         continue;
 387                                 }
 388                                 if (strcasecmp(buf, "transfer-encoding") == 0) {
 389                                         if (strcasecmp(s, "chunked") == 0) {
 390                                                 chunked = got_clen = 1;
 391                                         } else {
 392                                         close_delete_and_die("server wants to do %s transfer encoding", s);
 393                                         }
 394                                 }
 395                                 if (strcasecmp(buf, "location") == 0) {
 396                                         if (s[0] == '/')
 397                                                 target.path = bb_xstrdup(s+1);
 398                                         else {
 399                                                 parse_url(bb_xstrdup(s), &target);
 400                                                 if (!proxy) {
 401                                                         server.host = target.host;
 402                                                         server.port = target.port;
 403                                                 }
 404                                         }
 405                                 }
 406                         }
 407                 } while(status >= 300);
 408
 409                 dfp = sfp;
 410         }
 411         else
 412         {
 413                 /*
 414                  *  FTP session
 415                  */
 416                 if (! target.user)
 417                         target.user = bb_xstrdup("anonymous:busybox@");
 418
 419                 sfp = open_socket(server.host, server.port);
 420                 if (ftpcmd(NULL, NULL, sfp, buf) != 220)
 421                         close_delete_and_die("%s", buf+4);
 422
 423                 /*
 424                  * Splitting username:password pair,
 425                  * trying to log in
 426                  */
 427                 s = strchr(target.user, ':');
 428                 if (s)
 429                         *(s++) = '\0';
 430                 switch(ftpcmd("USER ", target.user, sfp, buf)) {
 431                         case 230:
 432                                 break;
 433                         case 331:
 434                                 if (ftpcmd("PASS ", s, sfp, buf) == 230)
 435                                         break;
 436                                 /* FALLTHRU (failed login) */
 437                         default:
 438                                 close_delete_and_die("ftp login: %s", buf+4);
 439                 }
 440
 441                 ftpcmd("CDUP", NULL, sfp, buf);
 442                 ftpcmd("TYPE I", NULL, sfp, buf);
 443
 444                 /*
 445                  * Querying file size
 446                  */
 447                 if (ftpcmd("SIZE /", target.path, sfp, buf) == 213) {
 448                         filesize = atol(buf+4);
 449                         got_clen = 1;
 450                 }
 451
 452                 /*
 453                  * Entering passive mode
 454                  */
 455                 if (ftpcmd("PASV", NULL, sfp, buf) !=  227)
 456                         close_delete_and_die("PASV: %s", buf+4);
 457                 s = strrchr(buf, ',');
 458                 *s = 0;
 459                 port = atoi(s+1);
 460                 s = strrchr(buf, ',');
 461                 port += atoi(s+1) * 256;
 462                 dfp = open_socket(server.host, port);
 463
 464                 if (do_continue) {
 465                         sprintf(buf, "REST %ld", beg_range);
 466                         if (ftpcmd(buf, NULL, sfp, buf) != 350) {
 467                                 if (output != stdout)
 468                                         output = freopen(fname_out, "w", output);
 469                                 do_continue = 0;
 470                         } else
 471                                 filesize -= beg_range;
 472                 }
 473
 474                 if (ftpcmd("RETR /", target.path, sfp, buf) > 150)
 475                         close_delete_and_die("RETR: %s", buf+4);
 476
 477         }
 478
 479
 480         /*
 481          * Retrieve file
 482          */
 483         if (chunked) {
 484                 fgets(buf, sizeof(buf), dfp);
 485                 filesize = strtol(buf, (char **) NULL, 16);
 486         }
 487 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
 488         if (quiet_flag==FALSE)
 489                 progressmeter(-1);
 490 #endif
 491         do {
 492                 while ((filesize > 0 || !got_clen) && (n = safe_fread(buf, 1, ((chunked || got_clen) && (filesize < sizeof(buf)) ? filesize : sizeof(buf)), dfp)) > 0) {
 493                         if (safe_fwrite(buf, 1, n, output) != n) {
 494                                 bb_perror_msg_and_die("write error");
 495                         }
 496 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
 497                         statbytes+=n;
 498 #endif
 499                         if (got_clen) {
 500                                 filesize -= n;
 501                         }
 502                 }
 503
 504                 if (chunked) {
 505                         safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
 506                         safe_fgets(buf, sizeof(buf), dfp);
 507                         filesize = strtol(buf, (char **) NULL, 16);
 508                         if (filesize==0) {
 509                                 chunked = 0; /* all done! */
 510                         }
 511                 }
 512
 513                 if (n == 0 && ferror(dfp)) {
 514                         bb_perror_msg_and_die("network read error");
 515                 }
 516         } while (chunked);
 517 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
 518         if (quiet_flag==FALSE)
 519                 progressmeter(1);
 520 #endif
 521         if (!proxy && target.is_ftp) {
 522                 fclose(dfp);
 523                 if (ftpcmd(NULL, NULL, sfp, buf) != 226)
 524                         bb_error_msg_and_die("ftp error: %s", buf+4);
 525                 ftpcmd("QUIT", NULL, sfp, buf);
 526         }
 527         exit(EXIT_SUCCESS);
 528 }
 529
 530
 531 void parse_url(char *url, struct host_info *h)
 532 {
 533         char *cp, *sp, *up, *pp;
 534
 535         if (strncmp(url, "http://", 7) == 0) {
 536                 h->port = 80;
 537                 h->host = url + 7;
 538                 h->is_ftp = 0;
 539         } else if (strncmp(url, "ftp://", 6) == 0) {
 540                 h->port = 21;
 541                 h->host = url + 6;
 542                 h->is_ftp = 1;
 543         } else
 544                 bb_error_msg_and_die("not an http or ftp url: %s", url);
 545
 546         sp = strchr(h->host, '/');
 547         if (sp != NULL) {
 548                 *sp++ = '\0';
 549                 h->path = sp;
 550         } else
 551                 h->path = bb_xstrdup("");
 552
 553         up = strrchr(h->host, '@');
 554         if (up != NULL) {
 555                 h->user = h->host;
 556                 *up++ = '\0';
 557                 h->host = up;
 558         } else
 559                 h->user = NULL;
 560
 561         pp = h->host;
 562
 563 #ifdef CONFIG_FEATURE_WGET_IP6_LITERAL
 564         if (h->host[0] == '[') {
 565                 char *ep;
 566
 567                 ep = h->host + 1;
 568                 while (*ep == ':' || isxdigit (*ep))
 569                         ep++;
 570                 if (*ep == ']') {
 571                         h->host++;
 572                         *ep = '\0';
 573                         pp = ep + 1;
 574                 }
 575         }
 576 #endif
 577
 578         cp = strchr(pp, ':');
 579         if (cp != NULL) {
 580                 *cp++ = '\0';
 581                 h->port = atoi(cp);
 582         }
 583
 584 }
 585
 586
 587 FILE *open_socket(char *host, int port)
 588 {
 589         int fd;
 590         FILE *fp;
 591         char port_str[10];
 592
 593         snprintf(port_str, sizeof(port_str), "%d", port);
 594         fd=xconnect(host, port_str);
 595
 596         /*
 597          * Get the server onto a stdio stream.
 598          */
 599         if ((fp = fdopen(fd, "r+")) == NULL)
 600                 bb_perror_msg_and_die("fdopen()");
 601
 602         return fp;
 603 }
 604
 605
 606 char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc)
 607 {
 608         char *s, *hdrval;
 609         int c;
 610
 611         *istrunc = 0;
 612
 613         /* retrieve header line */
 614         if (fgets(buf, bufsiz, fp) == NULL)
 615                 return NULL;
 616
 617         /* see if we are at the end of the headers */
 618         for (s = buf ; *s == '\r' ; ++s)
 619                 ;
 620         if (s[0] == '\n')
 621                 return NULL;
 622
 623         /* convert the header name to lower case */
 624         for (s = buf ; isalnum(*s) || *s == '-' ; ++s)
 625                 *s = tolower(*s);
 626
 627         /* verify we are at the end of the header name */
 628         if (*s != ':')
 629                 bb_error_msg_and_die("bad header line: %s", buf);
 630
 631         /* locate the start of the header value */
 632         for (*s++ = '\0' ; *s == ' ' || *s == '\t' ; ++s)
 633                 ;
 634         hdrval = s;
 635
 636         /* locate the end of header */
 637         while (*s != '\0' && *s != '\r' && *s != '\n')
 638                 ++s;
 639
 640         /* end of header found */
 641         if (*s != '\0') {
 642                 *s = '\0';
 643                 return hdrval;
 644         }
 645
 646         /* Rats!  The buffer isn't big enough to hold the entire header value. */
 647         while (c = getc(fp), c != EOF && c != '\n')
 648                 ;
 649         *istrunc = 1;
 650         return hdrval;
 651 }
 652
 653 static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf)
 654 {
 655         char *p;
 656
 657         if (s1) {
 658                 if (!s2) s2="";
 659                 fprintf(fp, "%s%s\r\n", s1, s2);
 660                 fflush(fp);
 661         }
 662
 663         do {
 664                 p = fgets(buf, 510, fp);
 665                 if (!p)
 666                         bb_perror_msg_and_die("fgets()");
 667         } while (! isdigit(buf[0]) || buf[3] != ' ');
 668
 669         return atoi(buf);
 670 }
 671
 672 #ifdef CONFIG_FEATURE_WGET_STATUSBAR
 673 /* Stuff below is from BSD rcp util.c, as added to openshh.
 674  * Original copyright notice is retained at the end of this file.
 675  *
 676  */
 677
 678
 679 static int
 680 getttywidth(void)
 681 {
 682         int width=0;
 683         get_terminal_width_height(0, &width, NULL);
 684         return (width);
 685 }
 686
 687 static void
 688 updateprogressmeter(int ignore)
 689 {
 690         int save_errno = errno;
 691
 692         progressmeter(0);
 693         errno = save_errno;
 694 }
 695
 696 static void
 697 alarmtimer(int wait)
 698 {
 699         struct itimerval itv;
 700
 701         itv.it_value.tv_sec = wait;
 702         itv.it_value.tv_usec = 0;
 703         itv.it_interval = itv.it_value;
 704         setitimer(ITIMER_REAL, &itv, NULL);
 705 }
 706
 707
 708 static void
 709 progressmeter(int flag)
 710 {
 711         static const char prefixes[] = " KMGTP";
 712         static struct timeval lastupdate;
 713         static off_t lastsize, totalsize;
 714         struct timeval now, td, wait;
 715         off_t cursize, abbrevsize;
 716         double elapsed;
 717         int ratio, barlength, i, remaining;
 718         char buf[256];
 719
 720         if (flag == -1) {
 721                 (void) gettimeofday(&start, (struct timezone *) 0);
 722                 lastupdate = start;
 723                 lastsize = 0;
 724                 totalsize = filesize; /* as filesize changes.. */
 725         }
 726
 727         (void) gettimeofday(&now, (struct timezone *) 0);
 728         cursize = statbytes;
 729         if (totalsize != 0 && !chunked) {
 730                 ratio = 100.0 * cursize / totalsize;
 731                 ratio = MAX(ratio, 0);
 732                 ratio = MIN(ratio, 100);
 733         } else
 734                 ratio = 100;
 735
 736         snprintf(buf, sizeof(buf), "\r%-20.20s %3d%% ", curfile, ratio);
 737
 738         barlength = getttywidth() - 51;
 739         if (barlength > 0) {
 740                 i = barlength * ratio / 100;
 741                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 742                          "|%.*s%*s|", i,
 743                          "*****************************************************************************"
 744                          "*****************************************************************************",
 745                          barlength - i, "");
 746         }
 747         i = 0;
 748         abbrevsize = cursize;
 749         while (abbrevsize >= 100000 && i < sizeof(prefixes)) {
 750                 i++;
 751                 abbrevsize >>= 10;
 752         }
 753         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " %5d %c%c ",
 754              (int) abbrevsize, prefixes[i], prefixes[i] == ' ' ? ' ' :
 755                  'B');
 756
 757         timersub(&now, &lastupdate, &wait);
 758         if (cursize > lastsize) {
 759                 lastupdate = now;
 760                 lastsize = cursize;
 761                 if (wait.tv_sec >= STALLTIME) {
 762                         start.tv_sec += wait.tv_sec;
 763                         start.tv_usec += wait.tv_usec;
 764                 }
 765                 wait.tv_sec = 0;
 766         }
 767         timersub(&now, &start, &td);
 768         elapsed = td.tv_sec + (td.tv_usec / 1000000.0);
 769
 770         if (wait.tv_sec >= STALLTIME) {
 771                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 772                          " - stalled -");
 773         } else if (statbytes <= 0 || elapsed <= 0.0 || cursize > totalsize || chunked) {
 774                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 775                          "   --:-- ETA");
 776         } else {
 777                 remaining = (int) (totalsize / (statbytes / elapsed) - elapsed);
 778                 i = remaining / 3600;
 779                 if (i)
 780                         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 781                                  "%2d:", i);
 782                 else
 783                         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 784                                  "   ");
 785                 i = remaining % 3600;
 786                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 787                          "%02d:%02d ETA", i / 60, i % 60);
 788         }
 789         write(fileno(stderr), buf, strlen(buf));
 790
 791         if (flag == -1) {
 792                 struct sigaction sa;
 793                 sa.sa_handler = updateprogressmeter;
 794                 sigemptyset(&sa.sa_mask);
 795                 sa.sa_flags = SA_RESTART;
 796                 sigaction(SIGALRM, &sa, NULL);
 797                 alarmtimer(1);
 798         } else if (flag == 1) {
 799                 alarmtimer(0);
 800                 statbytes = 0;
 801                 putc('\n', stderr);
 802         }
 803 }
 804 #endif
 805
 806 /* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
 807  * much of which was blatently stolen from openssh.  */
 808
 809 /*-
 810  * Copyright (c) 1992, 1993
 811  *      The Regents of the University of California.  All rights reserved.
 812  *
 813  * Redistribution and use in source and binary forms, with or without
 814  * modification, are permitted provided that the following conditions
 815  * are met:
 816  * 1. Redistributions of source code must retain the above copyright
 817  *    notice, this list of conditions and the following disclaimer.
 818  * 2. Redistributions in binary form must reproduce the above copyright
 819  *    notice, this list of conditions and the following disclaimer in the
 820  *    documentation and/or other materials provided with the distribution.
 821  *
 822  * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
 823  *              ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
 824  *
 825  * 4. Neither the name of the University nor the names of its contributors
 826  *    may be used to endorse or promote products derived from this software
 827  *    without specific prior written permission.
 828  *
 829  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 830  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 831  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 832  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 833  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 834  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 835  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 836  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 837  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 838  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 839  * SUCH DAMAGE.
 840  *
 841  *      $Id: wget.c,v 1.60 2003/09/15 08:33:37 andersen Exp $
 842  */
 843
 844
 845
 846 /*
 847 Local Variables:
 848 c-file-style: "linux"
 849 c-basic-offset: 4
 850 tab-width: 4
 851 End:
 852 */