1 /* vi: set sw=4 ts=4: */
3 * wget - retrieve a file using HTTP or FTP
5 * Chip Rosenthal Covad Communications <chip@laserlink.net>
6 * Licensed under GPLv2, see file LICENSE in this source tree.
8 * Copyright (C) 2010 Bradley M. Kuhn <bkuhn@ebb.org>
9 * Kuhn's copyrights are licensed GPLv2-or-later. File as a whole remains GPLv2.
16 //config: wget is a utility for non-interactive download of files from HTTP
17 //config: and FTP servers.
19 //config:config FEATURE_WGET_STATUSBAR
20 //config: bool "Enable a nifty process meter (+2k)"
22 //config: depends on WGET
24 //config: Enable the transfer progress bar for wget transfers.
26 //config:config FEATURE_WGET_AUTHENTICATION
27 //config: bool "Enable HTTP authentication"
29 //config: depends on WGET
31 //config: Support authenticated HTTP transfers.
33 //config:config FEATURE_WGET_LONG_OPTIONS
34 //config: bool "Enable long options"
36 //config: depends on WGET && LONG_OPTS
38 //config: Support long options for the wget applet.
40 //config:config FEATURE_WGET_TIMEOUT
41 //config: bool "Enable timeout option -T SEC"
43 //config: depends on WGET
45 //config: Supports network read and connect timeouts for wget,
46 //config: so that wget will give up and timeout, through the -T
47 //config: command line option.
49 //config: Currently only connect and network data read timeout are
50 //config: supported (i.e., timeout is not applied to the DNS query). When
51 //config: FEATURE_WGET_LONG_OPTIONS is also enabled, the --timeout option
52 //config: will work in addition to -T.
54 //config:config FEATURE_WGET_OPENSSL
55 //config: bool "Try to connect to HTTPS using openssl"
57 //config: depends on WGET
59 //config: Choose how wget establishes SSL connection for https:// URLs.
61 //config: Busybox itself contains no SSL code. wget will spawn
62 //config: a helper program to talk over HTTPS.
64 //config: OpenSSL has a simple SSL client for debug purposes.
65 //config: If you select "openssl" helper, wget will effectively call
66 //config: "openssl s_client -quiet -connect IP:443 2>/dev/null"
67 //config: and pipe its data through it.
68 //config: Note inconvenient API: host resolution is done twice,
69 //config: and there is no guarantee openssl's idea of IPv6 address
70 //config: format is the same as ours.
71 //config: Another problem is that s_client prints debug information
72 //config: to stderr, and it needs to be suppressed. This means
73 //config: all error messages get suppressed too.
74 //config: openssl is also a big binary, often dynamically linked
75 //config: against ~15 libraries.
77 //config:config FEATURE_WGET_SSL_HELPER
78 //config: bool "Try to connect to HTTPS using ssl_helper"
80 //config: depends on WGET
82 //config: Choose how wget establishes SSL connection for https:// URLs.
84 //config: Busybox itself contains no SSL code. wget will spawn
85 //config: a helper program to talk over HTTPS.
87 //config: ssl_helper is a tool which can be built statically
88 //config: from busybox sources against a small embedded SSL library.
89 //config: Please see networking/ssl_helper/README.
90 //config: It does not require double host resolution and emits
91 //config: error messages to stderr.
93 //config: Precompiled static binary may be available at
94 //config: http://busybox.net/downloads/binaries/
96 //applet:IF_WGET(APPLET(wget, BB_DIR_USR_BIN, BB_SUID_DROP))
98 //kbuild:lib-$(CONFIG_WGET) += wget.o
100 //usage:#define wget_trivial_usage
101 //usage: IF_FEATURE_WGET_LONG_OPTIONS(
102 //usage: "[-c|--continue] [-s|--spider] [-q|--quiet] [-O|--output-document FILE]\n"
103 //usage: " [--header 'header: value'] [-Y|--proxy on/off] [-P DIR]\n"
104 /* Since we ignore these opts, we don't show them in --help */
105 /* //usage: " [--no-check-certificate] [--no-cache] [--passive-ftp] [-t TRIES]" */
106 /* //usage: " [-nv] [-nc] [-nH] [-np]" */
107 //usage: " [-U|--user-agent AGENT]" IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
109 //usage: IF_NOT_FEATURE_WGET_LONG_OPTIONS(
110 //usage: "[-csq] [-O FILE] [-Y on/off] [-P DIR] [-U AGENT]"
111 //usage: IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
113 //usage:#define wget_full_usage "\n\n"
114 //usage: "Retrieve files via HTTP or FTP\n"
115 //usage: "\n -s Spider mode - only check file existence"
116 //usage: "\n -c Continue retrieval of aborted transfer"
117 //usage: "\n -q Quiet"
118 //usage: "\n -P DIR Save to DIR (default .)"
119 //usage: IF_FEATURE_WGET_TIMEOUT(
120 //usage: "\n -T SEC Network read timeout is SEC seconds"
122 //usage: "\n -O FILE Save to FILE ('-' for stdout)"
123 //usage: "\n -U STR Use STR for User-Agent header"
124 //usage: "\n -Y Use proxy ('on' or 'off')"
129 # define log_io(...) bb_error_msg(__VA_ARGS__)
130 # define SENDFMT(fp, fmt, ...) \
132 log_io("> " fmt, ##__VA_ARGS__); \
133 fprintf(fp, fmt, ##__VA_ARGS__); \
136 # define log_io(...) ((void)0)
137 # define SENDFMT(fp, fmt, ...) fprintf(fp, fmt, ##__VA_ARGS__)
145 const char *protocol;
149 static const char P_FTP[] ALIGN1 = "ftp";
150 static const char P_HTTP[] ALIGN1 = "http";
151 #if ENABLE_FEATURE_WGET_OPENSSL || ENABLE_FEATURE_WGET_SSL_HELPER
152 static const char P_HTTPS[] ALIGN1 = "https";
155 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
156 /* User-specified headers prevent using our corresponding built-in headers. */
159 HDR_USER_AGENT = (1<<1),
161 HDR_AUTH = (1<<3) * ENABLE_FEATURE_WGET_AUTHENTICATION,
162 HDR_PROXY_AUTH = (1<<4) * ENABLE_FEATURE_WGET_AUTHENTICATION,
164 static const char wget_user_headers[] ALIGN1 =
168 # if ENABLE_FEATURE_WGET_AUTHENTICATION
170 "Proxy-Authorization:\0"
173 # define USR_HEADER_HOST (G.user_headers & HDR_HOST)
174 # define USR_HEADER_USER_AGENT (G.user_headers & HDR_USER_AGENT)
175 # define USR_HEADER_RANGE (G.user_headers & HDR_RANGE)
176 # define USR_HEADER_AUTH (G.user_headers & HDR_AUTH)
177 # define USR_HEADER_PROXY_AUTH (G.user_headers & HDR_PROXY_AUTH)
178 #else /* No long options, no user-headers :( */
179 # define USR_HEADER_HOST 0
180 # define USR_HEADER_USER_AGENT 0
181 # define USR_HEADER_RANGE 0
182 # define USR_HEADER_AUTH 0
183 # define USR_HEADER_PROXY_AUTH 0
188 off_t content_len; /* Content-length of the file */
189 off_t beg_range; /* Range at which continue begins */
190 #if ENABLE_FEATURE_WGET_STATUSBAR
191 off_t transferred; /* Number of bytes transferred so far */
192 const char *curfile; /* Name of current file being transferred */
196 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
199 unsigned char user_headers; /* Headers mentioned by the user */
201 char *fname_out; /* where to direct output (-O) */
202 const char *proxy_flag; /* Use proxies if env vars are set */
203 const char *user_agent; /* "User-Agent" header field */
204 #if ENABLE_FEATURE_WGET_TIMEOUT
205 unsigned timeout_seconds;
206 bool die_if_timed_out;
210 smallint chunked; /* chunked transfer encoding */
211 smallint got_clen; /* got content-length: from server */
212 /* Local downloads do benefit from big buffer.
213 * With 512 byte buffer, it was measured to be
214 * an order of magnitude slower than with big one.
216 uint64_t just_to_align_next_member;
217 char wget_buf[CONFIG_FEATURE_COPYBUF_KB*1024];
219 #define G (*ptr_to_globals)
220 #define INIT_G() do { \
221 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
223 #define FINI_G() do { \
224 FREE_PTR_TO_GLOBALS(); \
228 /* Must match option string! */
230 WGET_OPT_CONTINUE = (1 << 0),
231 WGET_OPT_SPIDER = (1 << 1),
232 WGET_OPT_QUIET = (1 << 2),
233 WGET_OPT_OUTNAME = (1 << 3),
234 WGET_OPT_PREFIX = (1 << 4),
235 WGET_OPT_PROXY = (1 << 5),
236 WGET_OPT_USER_AGENT = (1 << 6),
237 WGET_OPT_NETWORK_READ_TIMEOUT = (1 << 7),
238 WGET_OPT_RETRIES = (1 << 8),
239 WGET_OPT_PASSIVE = (1 << 9),
240 WGET_OPT_HEADER = (1 << 10) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
241 WGET_OPT_POST_DATA = (1 << 11) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
249 #if ENABLE_FEATURE_WGET_STATUSBAR
250 static void progress_meter(int flag)
252 if (option_mask32 & WGET_OPT_QUIET)
255 if (flag == PROGRESS_START)
256 bb_progress_init(&G.pmt, G.curfile);
258 bb_progress_update(&G.pmt,
261 (G.chunked || !G.got_clen) ? 0 : G.beg_range + G.transferred + G.content_len
264 if (flag == PROGRESS_END) {
265 bb_progress_free(&G.pmt);
266 bb_putchar_stderr('\n');
271 static ALWAYS_INLINE void progress_meter(int flag UNUSED_PARAM) { }
275 /* IPv6 knows scoped address types i.e. link and site local addresses. Link
276 * local addresses can have a scope identifier to specify the
277 * interface/link an address is valid on (e.g. fe80::1%eth0). This scope
278 * identifier is only valid on a single node.
280 * RFC 4007 says that the scope identifier MUST NOT be sent across the wire,
281 * unless all nodes agree on the semantic. Apache e.g. regards zone identifiers
282 * in the Host header as invalid requests, see
283 * https://issues.apache.org/bugzilla/show_bug.cgi?id=35122
285 static void strip_ipv6_scope_id(char *host)
289 /* bbox wget actually handles IPv6 addresses without [], like
290 * wget "http://::1/xxx", but this is not standard.
291 * To save code, _here_ we do not support it. */
294 return; /* not IPv6 */
296 scope = strchr(host, '%');
300 /* Remove the IPv6 zone identifier from the host address */
301 cp = strchr(host, ']');
302 if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
303 /* malformed address (not "[xx]:nn" or "[xx]") */
307 /* cp points to "]...", scope points to "%eth0]..." */
308 overlapping_strcpy(scope, cp);
311 #if ENABLE_FEATURE_WGET_AUTHENTICATION
312 /* Base64-encode character string. */
313 static char *base64enc(const char *str)
315 unsigned len = strlen(str);
316 if (len > sizeof(G.wget_buf)/4*3 - 10) /* paranoia */
317 len = sizeof(G.wget_buf)/4*3 - 10;
318 bb_uuencode(G.wget_buf, str, len, bb_uuenc_tbl_base64);
323 static char* sanitize_string(char *s)
325 unsigned char *p = (void *) s;
332 #if ENABLE_FEATURE_WGET_TIMEOUT
333 static void alarm_handler(int sig UNUSED_PARAM)
335 /* This is theoretically unsafe (uses stdio and malloc in signal handler) */
336 if (G.die_if_timed_out)
337 bb_error_msg_and_die("download timed out");
339 static void set_alarm(void)
341 if (G.timeout_seconds) {
342 alarm(G.timeout_seconds);
343 G.die_if_timed_out = 1;
346 # define clear_alarm() ((void)(G.die_if_timed_out = 0))
348 # define set_alarm() ((void)0)
349 # define clear_alarm() ((void)0)
352 static FILE *open_socket(len_and_sockaddr *lsa)
358 fd = xconnect_stream(lsa);
361 /* glibc 2.4 seems to try seeking on it - ??! */
362 /* hopefully it understands what ESPIPE means... */
363 fp = fdopen(fd, "r+");
365 bb_perror_msg_and_die(bb_msg_memory_exhausted);
370 /* Returns '\n' if it was seen, else '\0'. Trims at first '\r' or '\n' */
371 static char fgets_and_trim(FILE *fp)
377 if (fgets(G.wget_buf, sizeof(G.wget_buf) - 1, fp) == NULL)
378 bb_perror_msg_and_die("error getting response");
381 buf_ptr = strchrnul(G.wget_buf, '\n');
384 buf_ptr = strchrnul(G.wget_buf, '\r');
387 log_io("< %s", G.wget_buf);
392 static int ftpcmd(const char *s1, const char *s2, FILE *fp)
398 fprintf(fp, "%s%s\r\n", s1, s2);
400 log_io("> %s%s", s1, s2);
405 } while (!isdigit(G.wget_buf[0]) || G.wget_buf[3] != ' ');
407 G.wget_buf[3] = '\0';
408 result = xatoi_positive(G.wget_buf);
413 static void parse_url(const char *src_url, struct host_info *h)
418 h->allocated = url = xstrdup(src_url);
421 p = strstr(url, "://");
425 if (strcmp(url, P_FTP) == 0) {
426 h->port = bb_lookup_port(P_FTP, "tcp", 21);
428 #if ENABLE_FEATURE_WGET_OPENSSL || ENABLE_FEATURE_WGET_SSL_HELPER
429 if (strcmp(url, P_HTTPS) == 0) {
430 h->port = bb_lookup_port(P_HTTPS, "tcp", 443);
431 h->protocol = P_HTTPS;
434 if (strcmp(url, P_HTTP) == 0) {
436 h->port = bb_lookup_port(P_HTTP, "tcp", 80);
437 h->protocol = P_HTTP;
440 bb_error_msg_and_die("not an http or ftp url: %s", sanitize_string(url));
443 // GNU wget is user-friendly and falls back to http://
449 // "Real" wget 'http://busybox.net?var=a/b' sends this request:
450 // 'GET /?var=a/b HTTP 1.0'
451 // and saves 'index.html?var=a%2Fb' (we save 'b')
452 // wget 'http://busybox.net?login=john@doe':
453 // request: 'GET /?login=john@doe HTTP/1.0'
454 // saves: 'index.html?login=john@doe' (we save '?login=john@doe')
455 // wget 'http://busybox.net#test/test':
456 // request: 'GET / HTTP/1.0'
457 // saves: 'index.html' (we save 'test')
459 // We also don't add unique .N suffix if file exists...
460 sp = strchr(h->host, '/');
461 p = strchr(h->host, '?'); if (!sp || (p && sp > p)) sp = p;
462 p = strchr(h->host, '#'); if (!sp || (p && sp > p)) sp = p;
465 } else if (*sp == '/') {
468 } else { // '#' or '?'
469 // http://busybox.net?login=john@doe is a valid URL
470 // memmove converts to:
471 // http:/busybox.nett?login=john@doe...
472 memmove(h->host - 1, h->host, sp - h->host);
478 sp = strrchr(h->host, '@');
480 // URL-decode "user:password" string before base64-encoding:
481 // wget http://test:my%20pass@example.com should send
482 // Authorization: Basic dGVzdDpteSBwYXNz
483 // which decodes to "test:my pass".
484 // Standard wget and curl do this too.
487 h->user = xstrdup(percent_decode_in_place(h->host, /*strict:*/ 0));
490 /* else: h->user remains NULL, or as set by original request
491 * before redirect (if we are here after a redirect).
495 static char *gethdr(FILE *fp)
500 /* retrieve header line */
501 c = fgets_and_trim(fp);
503 /* end of the headers? */
504 if (G.wget_buf[0] == '\0')
507 /* convert the header name to lower case */
508 for (s = G.wget_buf; isalnum(*s) || *s == '-' || *s == '.' || *s == '_'; ++s) {
510 * No-op for 20-3f and 60-7f. "0-9a-z-." are in these ranges.
511 * 40-5f range ("@A-Z[\]^_") maps to 60-7f.
512 * "A-Z" maps to "a-z".
513 * "@[\]" can't occur in header names.
514 * "^_" maps to "~,DEL" (which is wrong).
515 * "^" was never seen yet, "_" was seen from web.archive.org
516 * (x-archive-orig-x_commoncrawl_Signature: HEXSTRING).
521 /* verify we are at the end of the header name */
523 bb_error_msg_and_die("bad header line: %s", sanitize_string(G.wget_buf));
525 /* locate the start of the header value */
527 hdrval = skip_whitespace(s);
530 /* Rats! The buffer isn't big enough to hold the entire header value */
531 while (c = getc(fp), c != EOF && c != '\n')
538 static void reset_beg_range_to_zero(void)
540 bb_error_msg("restart failed");
542 xlseek(G.output_fd, 0, SEEK_SET);
543 /* Done at the end instead: */
544 /* ftruncate(G.output_fd, 0); */
547 static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_sockaddr *lsa)
554 target->user = xstrdup("anonymous:busybox@");
556 sfp = open_socket(lsa);
557 if (ftpcmd(NULL, NULL, sfp) != 220)
558 bb_error_msg_and_die("%s", sanitize_string(G.wget_buf + 4));
561 * Splitting username:password pair,
564 str = strchr(target->user, ':');
567 switch (ftpcmd("USER ", target->user, sfp)) {
571 if (ftpcmd("PASS ", str, sfp) == 230)
573 /* fall through (failed login) */
575 bb_error_msg_and_die("ftp login: %s", sanitize_string(G.wget_buf + 4));
578 ftpcmd("TYPE I", NULL, sfp);
583 if (ftpcmd("SIZE ", target->path, sfp) == 213) {
584 G.content_len = BB_STRTOOFF(G.wget_buf + 4, NULL, 10);
585 if (G.content_len < 0 || errno) {
586 bb_error_msg_and_die("SIZE value is garbage");
592 * Entering passive mode
594 if (ftpcmd("PASV", NULL, sfp) != 227) {
596 bb_error_msg_and_die("bad response to %s: %s", "PASV", sanitize_string(G.wget_buf));
598 // Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage]
599 // Server's IP is N1.N2.N3.N4 (we ignore it)
600 // Server's port for data connection is P1*256+P2
601 str = strrchr(G.wget_buf, ')');
602 if (str) str[0] = '\0';
603 str = strrchr(G.wget_buf, ',');
604 if (!str) goto pasv_error;
605 port = xatou_range(str+1, 0, 255);
607 str = strrchr(G.wget_buf, ',');
608 if (!str) goto pasv_error;
609 port += xatou_range(str+1, 0, 255) * 256;
610 set_nport(&lsa->u.sa, htons(port));
612 *dfpp = open_socket(lsa);
614 if (G.beg_range != 0) {
615 sprintf(G.wget_buf, "REST %"OFF_FMT"u", G.beg_range);
616 if (ftpcmd(G.wget_buf, NULL, sfp) == 350)
617 G.content_len -= G.beg_range;
619 reset_beg_range_to_zero();
622 if (ftpcmd("RETR ", target->path, sfp) > 150)
623 bb_error_msg_and_die("bad response to %s: %s", "RETR", sanitize_string(G.wget_buf));
628 #if ENABLE_FEATURE_WGET_OPENSSL
629 static int spawn_https_helper_openssl(const char *host, unsigned port)
631 char *allocated = NULL;
634 IF_FEATURE_WGET_SSL_HELPER(volatile int child_failed = 0;)
636 if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) != 0)
637 /* Kernel can have AF_UNIX support disabled */
638 bb_perror_msg_and_die("socketpair");
640 if (!strchr(host, ':'))
641 host = allocated = xasprintf("%s:%u", host, port);
653 * openssl s_client -quiet -connect www.kernel.org:443 2>/dev/null
654 * It prints some debug stuff on stderr, don't know how to suppress it.
655 * Work around by dev-nulling stderr. We lose all error messages :(
658 xopen("/dev/null", O_RDWR);
659 argv[0] = (char*)"openssl";
660 argv[1] = (char*)"s_client";
661 argv[2] = (char*)"-quiet";
662 argv[3] = (char*)"-connect";
663 argv[4] = (char*)host;
665 BB_EXECVP(argv[0], argv);
667 # if ENABLE_FEATURE_WGET_SSL_HELPER
671 bb_perror_msg_and_die("can't execute '%s'", argv[0]);
679 # if ENABLE_FEATURE_WGET_SSL_HELPER
689 /* See networking/ssl_helper/README how to build one */
690 #if ENABLE_FEATURE_WGET_SSL_HELPER
691 static void spawn_https_helper_small(int network_fd)
696 if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) != 0)
697 /* Kernel can have AF_UNIX support disabled */
698 bb_perror_msg_and_die("socketpair");
700 pid = BB_MMU ? xfork() : xvfork();
708 xmove_fd(network_fd, 3);
710 * A simple ssl/tls helper
712 argv[0] = (char*)"ssl_helper";
713 argv[1] = (char*)"-d3";
715 BB_EXECVP(argv[0], argv);
716 bb_perror_msg_and_die("can't execute '%s'", argv[0]);
722 xmove_fd(sp[0], network_fd);
726 static void NOINLINE retrieve_file_data(FILE *dfp)
728 #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
729 # if ENABLE_FEATURE_WGET_TIMEOUT
730 unsigned second_cnt = G.timeout_seconds;
732 struct pollfd polldata;
734 polldata.fd = fileno(dfp);
735 polldata.events = POLLIN | POLLPRI;
737 progress_meter(PROGRESS_START);
742 /* Loops only if chunked */
745 #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
746 /* Must use nonblocking I/O, otherwise fread will loop
747 * and *block* until it reads full buffer,
748 * which messes up progress bar and/or timeout logic.
749 * Because of nonblocking I/O, we need to dance
750 * very carefully around EAGAIN. See explanation at
753 ndelay_on(polldata.fd);
759 #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
760 /* fread internally uses read loop, which in our case
761 * is usually exited when we get EAGAIN.
762 * In this case, libc sets error marker on the stream.
763 * Need to clear it before next fread to avoid possible
764 * rare false positive ferror below. Rare because usually
765 * fread gets more than zero bytes, and we don't fall
766 * into if (n <= 0) ...
771 rdsz = sizeof(G.wget_buf);
773 if (G.content_len < (off_t)sizeof(G.wget_buf)) {
774 if ((int)G.content_len <= 0)
776 rdsz = (unsigned)G.content_len;
779 n = fread(G.wget_buf, 1, rdsz, dfp);
782 xwrite(G.output_fd, G.wget_buf, n);
783 #if ENABLE_FEATURE_WGET_STATUSBAR
788 if (G.content_len == 0)
791 #if ENABLE_FEATURE_WGET_TIMEOUT
792 second_cnt = G.timeout_seconds;
799 * If error occurs, or EOF is reached, the return value
800 * is a short item count (or zero).
801 * fread does not distinguish between EOF and error.
803 if (errno != EAGAIN) {
805 progress_meter(PROGRESS_END);
806 bb_perror_msg_and_die(bb_msg_read_error);
808 break; /* EOF, not error */
811 #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
812 /* It was EAGAIN. There is no data. Wait up to one second
813 * then abort if timed out, or update the bar and try reading again.
815 if (safe_poll(&polldata, 1, 1000) == 0) {
816 # if ENABLE_FEATURE_WGET_TIMEOUT
817 if (second_cnt != 0 && --second_cnt == 0) {
818 progress_meter(PROGRESS_END);
819 bb_error_msg_and_die("download timed out");
822 /* We used to loop back to poll here,
823 * but there is no great harm in letting fread
824 * to try reading anyway.
829 /* Need to do it _every_ second for "stalled" indicator
830 * to be shown properly.
832 progress_meter(PROGRESS_BUMP);
833 } /* while (reading data) */
835 #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
837 ndelay_off(polldata.fd); /* else fgets can get very unhappy */
842 fgets_and_trim(dfp); /* Eat empty line */
845 G.content_len = STRTOOFF(G.wget_buf, NULL, 16);
846 /* FIXME: error check? */
847 if (G.content_len == 0)
848 break; /* all done! */
851 * Note that fgets may result in some data being buffered in dfp.
852 * We loop back to fread, which will retrieve this data.
853 * Also note that code has to be arranged so that fread
854 * is done _before_ one-second poll wait - poll doesn't know
855 * about stdio buffering and can result in spurious one second waits!
859 /* If -c failed, we restart from the beginning,
860 * but we do not truncate file then, we do it only now, at the end.
861 * This lets user to ^C if his 99% complete 10 GB file download
862 * failed to restart *without* losing the almost complete file.
865 off_t pos = lseek(G.output_fd, 0, SEEK_CUR);
866 if (pos != (off_t)-1)
867 ftruncate(G.output_fd, pos);
870 /* Draw full bar and free its resources */
871 G.chunked = 0; /* makes it show 100% even for chunked download */
872 G.got_clen = 1; /* makes it show 100% even for download of (formerly) unknown size */
873 progress_meter(PROGRESS_END);
876 static void download_one_url(const char *url)
878 bool use_proxy; /* Use proxies if env vars are set */
880 len_and_sockaddr *lsa;
881 FILE *sfp; /* socket to web/ftp server */
882 FILE *dfp; /* socket to ftp server (data) */
884 char *fname_out_alloc;
885 char *redirected_path = NULL;
886 struct host_info server;
887 struct host_info target;
889 server.allocated = NULL;
890 target.allocated = NULL;
894 parse_url(url, &target);
896 /* Use the proxy if necessary */
897 use_proxy = (strcmp(G.proxy_flag, "off") != 0);
899 proxy = getenv(target.protocol == P_FTP ? "ftp_proxy" : "http_proxy");
900 //FIXME: what if protocol is https? Ok to use http_proxy?
901 use_proxy = (proxy && proxy[0]);
903 parse_url(proxy, &server);
906 server.port = target.port;
907 if (ENABLE_FEATURE_IPV6) {
908 //free(server.allocated); - can't be non-NULL
909 server.host = server.allocated = xstrdup(target.host);
911 server.host = target.host;
915 if (ENABLE_FEATURE_IPV6)
916 strip_ipv6_scope_id(target.host);
918 /* If there was no -O FILE, guess output filename */
919 fname_out_alloc = NULL;
920 if (!(option_mask32 & WGET_OPT_OUTNAME)) {
921 G.fname_out = bb_get_last_path_component_nostrip(target.path);
922 /* handle "wget http://kernel.org//" */
923 if (G.fname_out[0] == '/' || !G.fname_out[0])
924 G.fname_out = (char*)"index.html";
925 /* -P DIR is considered only if there was no -O FILE */
927 G.fname_out = fname_out_alloc = concat_path_file(G.dir_prefix, G.fname_out);
929 /* redirects may free target.path later, need to make a copy */
930 G.fname_out = fname_out_alloc = xstrdup(G.fname_out);
933 #if ENABLE_FEATURE_WGET_STATUSBAR
934 G.curfile = bb_get_last_path_component_nostrip(G.fname_out);
937 /* Determine where to start transfer */
939 if (option_mask32 & WGET_OPT_CONTINUE) {
940 G.output_fd = open(G.fname_out, O_WRONLY);
941 if (G.output_fd >= 0) {
942 G.beg_range = xlseek(G.output_fd, 0, SEEK_END);
944 /* File doesn't exist. We do not create file here yet.
945 * We are not sure it exists on remote side */
950 lsa = xhost2sockaddr(server.host, server.port);
951 if (!(option_mask32 & WGET_OPT_QUIET)) {
952 char *s = xmalloc_sockaddr2dotted(&lsa->u.sa);
953 fprintf(stderr, "Connecting to %s (%s)\n", server.host, s);
957 /*G.content_len = 0; - redundant, got_clen = 0 is enough */
960 if (use_proxy || target.protocol != P_FTP) {
967 /* Open socket to http(s) server */
968 #if ENABLE_FEATURE_WGET_OPENSSL
969 /* openssl (and maybe ssl_helper) support is configured */
970 if (target.protocol == P_HTTPS) {
971 /* openssl-based helper
972 * Inconvenient API since we can't give it an open fd
974 int fd = spawn_https_helper_openssl(server.host, server.port);
975 # if ENABLE_FEATURE_WGET_SSL_HELPER
976 if (fd < 0) { /* no openssl? try ssl_helper */
977 sfp = open_socket(lsa);
978 spawn_https_helper_small(fileno(sfp));
982 /* We don't check for exec("openssl") failure in this case */
984 sfp = fdopen(fd, "r+");
986 bb_perror_msg_and_die(bb_msg_memory_exhausted);
989 sfp = open_socket(lsa);
991 #elif ENABLE_FEATURE_WGET_SSL_HELPER
992 /* Only ssl_helper support is configured */
993 sfp = open_socket(lsa);
994 if (target.protocol == P_HTTPS)
995 spawn_https_helper_small(fileno(sfp));
997 /* ssl (https) support is not configured */
998 sfp = open_socket(lsa);
1000 /* Send HTTP request */
1002 SENDFMT(sfp, "GET %s://%s/%s HTTP/1.1\r\n",
1003 target.protocol, target.host,
1006 SENDFMT(sfp, "%s /%s HTTP/1.1\r\n",
1007 (option_mask32 & WGET_OPT_POST_DATA) ? "POST" : "GET",
1010 if (!USR_HEADER_HOST)
1011 SENDFMT(sfp, "Host: %s\r\n", target.host);
1012 if (!USR_HEADER_USER_AGENT)
1013 SENDFMT(sfp, "User-Agent: %s\r\n", G.user_agent);
1015 /* Ask server to close the connection as soon as we are done
1016 * (IOW: we do not intend to send more requests)
1018 SENDFMT(sfp, "Connection: close\r\n");
1020 #if ENABLE_FEATURE_WGET_AUTHENTICATION
1021 if (target.user && !USR_HEADER_AUTH) {
1022 SENDFMT(sfp, "Proxy-Authorization: Basic %s\r\n"+6,
1023 base64enc(target.user));
1025 if (use_proxy && server.user && !USR_HEADER_PROXY_AUTH) {
1026 SENDFMT(sfp, "Proxy-Authorization: Basic %s\r\n",
1027 base64enc(server.user));
1031 if (G.beg_range != 0 && !USR_HEADER_RANGE)
1032 SENDFMT(sfp, "Range: bytes=%"OFF_FMT"u-\r\n", G.beg_range);
1034 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
1035 if (G.extra_headers) {
1036 log_io(G.extra_headers);
1037 fputs(G.extra_headers, sfp);
1040 if (option_mask32 & WGET_OPT_POST_DATA) {
1042 "Content-Type: application/x-www-form-urlencoded\r\n"
1043 "Content-Length: %u\r\n"
1046 (int) strlen(G.post_data), G.post_data
1051 SENDFMT(sfp, "\r\n");
1057 * Retrieve HTTP response line and check for "200" status code.
1060 fgets_and_trim(sfp);
1063 str = skip_non_whitespace(str);
1064 str = skip_whitespace(str);
1065 // FIXME: no error check
1066 // xatou wouldn't work: "200 OK"
1071 while (gethdr(sfp) != NULL)
1072 /* eat all remaining headers */;
1076 Response 204 doesn't say "null file", it says "metadata
1077 has changed but data didn't":
1079 "10.2.5 204 No Content
1080 The server has fulfilled the request but does not need to return
1081 an entity-body, and might want to return updated metainformation.
1082 The response MAY include new or updated metainformation in the form
1083 of entity-headers, which if present SHOULD be associated with
1084 the requested variant.
1086 If the client is a user agent, it SHOULD NOT change its document
1087 view from that which caused the request to be sent. This response
1088 is primarily intended to allow input for actions to take place
1089 without causing a change to the user agent's active document view,
1090 although any new or updated metainformation SHOULD be applied
1091 to the document currently in the user agent's active view.
1093 The 204 response MUST NOT include a message-body, and thus
1094 is always terminated by the first empty line after the header fields."
1096 However, in real world it was observed that some web servers
1097 (e.g. Boa/0.94.14rc21) simply use code 204 when file size is zero.
1100 if (G.beg_range != 0) {
1101 /* "Range:..." was not honored by the server.
1102 * Restart download from the beginning.
1104 reset_beg_range_to_zero();
1107 case 300: /* redirection */
1112 case 206: /* Partial Content */
1113 if (G.beg_range != 0)
1114 /* "Range:..." worked. Good. */
1116 /* Partial Content even though we did not ask for it??? */
1119 bb_error_msg_and_die("server returned error: %s", sanitize_string(G.wget_buf));
1123 * Retrieve HTTP headers.
1125 while ((str = gethdr(sfp)) != NULL) {
1126 static const char keywords[] ALIGN1 =
1127 "content-length\0""transfer-encoding\0""location\0";
1129 KEY_content_length = 1, KEY_transfer_encoding, KEY_location
1133 /* gethdr converted "FOO:" string to lowercase */
1135 /* strip trailing whitespace */
1136 char *s = strchrnul(str, '\0') - 1;
1137 while (s >= str && (*s == ' ' || *s == '\t')) {
1141 key = index_in_strings(keywords, G.wget_buf) + 1;
1142 if (key == KEY_content_length) {
1143 G.content_len = BB_STRTOOFF(str, NULL, 10);
1144 if (G.content_len < 0 || errno) {
1145 bb_error_msg_and_die("content-length %s is garbage", sanitize_string(str));
1150 if (key == KEY_transfer_encoding) {
1151 if (strcmp(str_tolower(str), "chunked") != 0)
1152 bb_error_msg_and_die("transfer encoding '%s' is not supported", sanitize_string(str));
1155 if (key == KEY_location && status >= 300) {
1156 if (--redir_limit == 0)
1157 bb_error_msg_and_die("too many redirections");
1159 if (str[0] == '/') {
1160 free(redirected_path);
1161 target.path = redirected_path = xstrdup(str+1);
1162 /* lsa stays the same: it's on the same server */
1164 parse_url(str, &target);
1166 /* server.user remains untouched */
1167 free(server.allocated);
1168 server.allocated = NULL;
1169 server.host = target.host;
1170 /* strip_ipv6_scope_id(target.host); - no! */
1171 /* we assume remote never gives us IPv6 addr with scope id */
1172 server.port = target.port;
1175 } /* else: lsa stays the same: we use proxy */
1177 goto establish_session;
1180 // if (status >= 300)
1181 // bb_error_msg_and_die("bad redirection (no Location: header from server)");
1183 /* For HTTP, data is pumped over the same connection */
1189 sfp = prepare_ftp_session(&dfp, &target, lsa);
1194 if (!(option_mask32 & WGET_OPT_SPIDER)) {
1195 if (G.output_fd < 0)
1196 G.output_fd = xopen(G.fname_out, G.o_flags);
1197 retrieve_file_data(dfp);
1198 if (!(option_mask32 & WGET_OPT_OUTNAME)) {
1199 xclose(G.output_fd);
1205 /* It's ftp. Close data connection properly */
1207 if (ftpcmd(NULL, NULL, sfp) != 226)
1208 bb_error_msg_and_die("ftp error: %s", sanitize_string(G.wget_buf + 4));
1209 /* ftpcmd("QUIT", NULL, sfp); - why bother? */
1213 free(server.allocated);
1214 free(target.allocated);
1217 free(fname_out_alloc);
1218 free(redirected_path);
1221 int wget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1222 int wget_main(int argc UNUSED_PARAM, char **argv)
1224 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
1225 static const char wget_longopts[] ALIGN1 =
1226 /* name, has_arg, val */
1227 "continue\0" No_argument "c"
1228 //FIXME: -s isn't --spider, it's --save-headers!
1229 "spider\0" No_argument "s"
1230 "quiet\0" No_argument "q"
1231 "output-document\0" Required_argument "O"
1232 "directory-prefix\0" Required_argument "P"
1233 "proxy\0" Required_argument "Y"
1234 "user-agent\0" Required_argument "U"
1235 IF_FEATURE_WGET_TIMEOUT(
1236 "timeout\0" Required_argument "T")
1238 IF_DESKTOP( "tries\0" Required_argument "t")
1239 "header\0" Required_argument "\xff"
1240 "post-data\0" Required_argument "\xfe"
1241 /* Ignored (we always use PASV): */
1242 IF_DESKTOP( "passive-ftp\0" No_argument "\xf0")
1243 /* Ignored (we don't do ssl) */
1244 IF_DESKTOP( "no-check-certificate\0" No_argument "\xf0")
1245 /* Ignored (we don't support caching) */
1246 IF_DESKTOP( "no-cache\0" No_argument "\xf0")
1247 IF_DESKTOP( "no-verbose\0" No_argument "\xf0")
1248 IF_DESKTOP( "no-clobber\0" No_argument "\xf0")
1249 IF_DESKTOP( "no-host-directories\0" No_argument "\xf0")
1250 IF_DESKTOP( "no-parent\0" No_argument "\xf0")
1254 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
1255 llist_t *headers_llist = NULL;
1260 #if ENABLE_FEATURE_WGET_TIMEOUT
1261 G.timeout_seconds = 900;
1262 signal(SIGALRM, alarm_handler);
1264 G.proxy_flag = "on"; /* use proxies if env vars are set */
1265 G.user_agent = "Wget"; /* "User-Agent" header field */
1267 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
1268 applet_long_options = wget_longopts;
1270 opt_complementary = "-1" /* at least one URL */
1271 IF_FEATURE_WGET_TIMEOUT(":T+") /* -T NUM */
1272 IF_FEATURE_WGET_LONG_OPTIONS(":\xff::"); /* --header is a list */
1273 getopt32(argv, "csqO:P:Y:U:T:"
1276 /* wget has exactly four -n<letter> opts, all of which we can ignore:
1277 * -nv --no-verbose: be moderately quiet (-q is full quiet)
1278 * -nc --no-clobber: abort if exists, neither download to FILE.n nor overwrite FILE
1279 * -nH --no-host-directories: wget -r http://host/ won't create host/
1281 * "n::" above says that we accept -n[ARG].
1282 * Specifying "n:" would be a bug: "-n ARG" would eat ARG!
1284 , &G.fname_out, &G.dir_prefix,
1285 &G.proxy_flag, &G.user_agent,
1286 IF_FEATURE_WGET_TIMEOUT(&G.timeout_seconds) IF_NOT_FEATURE_WGET_TIMEOUT(NULL),
1287 NULL, /* -t RETRIES */
1289 IF_FEATURE_WGET_LONG_OPTIONS(, &headers_llist)
1290 IF_FEATURE_WGET_LONG_OPTIONS(, &G.post_data)
1294 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
1295 if (headers_llist) {
1298 llist_t *ll = headers_llist;
1300 size += strlen(ll->data) + 2;
1303 G.extra_headers = hdr = xmalloc(size + 1);
1304 while (headers_llist) {
1308 size = sprintf(hdr, "%s\r\n",
1309 (char*)llist_pop(&headers_llist));
1310 /* a bit like index_in_substrings but don't match full key */
1312 words = wget_user_headers;
1314 if (strstr(hdr, words) == hdr) {
1315 G.user_headers |= bit;
1319 words += strlen(words) + 1;
1327 G.o_flags = O_WRONLY | O_CREAT | O_TRUNC | O_EXCL;
1328 if (G.fname_out) { /* -O FILE ? */
1329 if (LONE_DASH(G.fname_out)) { /* -O - ? */
1331 option_mask32 &= ~WGET_OPT_CONTINUE;
1333 /* compat with wget: -O FILE can overwrite */
1334 G.o_flags = O_WRONLY | O_CREAT | O_TRUNC;
1338 download_one_url(*argv++);
1340 if (G.output_fd >= 0)
1341 xclose(G.output_fd);
1343 #if ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_WGET_LONG_OPTIONS
1344 free(G.extra_headers);
1348 return EXIT_SUCCESS;