busybox/networking/wget.c

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/* vi: set sw=4 ts=4: */
/*
* wget - retrieve a file using HTTP or FTP
*
* Chip Rosenthal Covad Communications <chip@laserlink.net>
* Licensed under GPLv2, see file LICENSE in this source tree.
*
* Copyright (C) 2010 Bradley M. Kuhn <bkuhn@ebb.org>
* Kuhn's copyrights are licensed GPLv2-or-later. File as a whole remains GPLv2.
*/
//config:config WGET
//config: bool "wget (35 kb)"
//config: default y
//config: help
//config: wget is a utility for non-interactive download of files from HTTP
//config: and FTP servers.
//config:
//config:config FEATURE_WGET_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on WGET && LONG_OPTS
//config:
//config:config FEATURE_WGET_STATUSBAR
//config: bool "Enable progress bar (+2k)"
//config: default y
//config: depends on WGET
//config:
//config:config FEATURE_WGET_AUTHENTICATION
//config: bool "Enable HTTP authentication"
//config: default y
//config: depends on WGET
//config: help
//config: Support authenticated HTTP transfers.
//config:
//config:config FEATURE_WGET_TIMEOUT
//config: bool "Enable timeout option -T SEC"
//config: default y
//config: depends on WGET
//config: help
//config: Supports network read and connect timeouts for wget,
//config: so that wget will give up and timeout, through the -T
//config: command line option.
//config:
//config: Currently only connect and network data read timeout are
//config: supported (i.e., timeout is not applied to the DNS query). When
//config: FEATURE_WGET_LONG_OPTIONS is also enabled, the --timeout option
//config: will work in addition to -T.
//config:
//config:config FEATURE_WGET_HTTPS
//config: bool "Support HTTPS using internal TLS code"
//it also enables FTPS support, but it's not well tested yet
//config: default y
//config: depends on WGET
//config: select TLS
//config: help
//config: wget will use internal TLS code to connect to https:// URLs.
//config: Note:
//config: On NOMMU machines, ssl_helper applet should be available
//config: in the $PATH for this to work. Make sure to select that applet.
//config:
//config: Note: currently, TLS code only makes TLS I/O work, it
//config: does *not* check that the peer is who it claims to be, etc.
//config: IOW: it uses peer-supplied public keys to establish encryption
//config: and signing keys, then encrypts and signs outgoing data and
//config: decrypts incoming data.
//config: It does not check signature hashes on the incoming data:
//config: this means that attackers manipulating TCP packets can
//config: send altered data and we unknowingly receive garbage.
//config: (This check might be relatively easy to add).
//config: It does not check public key's certificate:
//config: this means that the peer may be an attacker impersonating
//config: the server we think we are talking to.
//config:
//config: If you think this is unacceptable, consider this. As more and more
//config: servers switch to HTTPS-only operation, without such "crippled"
//config: TLS code it is *impossible* to simply download a kernel source
//config: from kernel.org. Which can in real world translate into
//config: "my small automatic tooling to build cross-compilers from sources
//config: no longer works, I need to additionally keep a local copy
//config: of ~4 megabyte source tarball of a SSL library and ~2 megabyte
//config: source of wget, need to compile and built both before I can
//config: download anything. All this despite the fact that the build
//config: is done in a QEMU sandbox on a machine with absolutely nothing
//config: worth stealing, so I don't care if someone would go to a lot
//config: of trouble to intercept my HTTPS download to send me an altered
//config: kernel tarball".
//config:
//config: If you still think this is unacceptable, send patches.
//config:
//config: If you still think this is unacceptable, do not want to send
//config: patches, but do want to waste bandwidth expaining how wrong
//config: it is, you will be ignored.
//config:
//config:config FEATURE_WGET_OPENSSL
//config: bool "Try to connect to HTTPS using openssl"
//config: default y
//config: depends on WGET
//config: help
//config: Try to use openssl to handle HTTPS.
//config:
//config: OpenSSL has a simple SSL client for debug purposes.
//config: If you select this option, wget will effectively run:
//config: "openssl s_client -quiet -connect hostname:443
//config: -servername hostname 2>/dev/null" and pipe its data
//config: through it. -servername is not used if hostname is numeric.
//config: Note inconvenient API: host resolution is done twice,
//config: and there is no guarantee openssl's idea of IPv6 address
//config: format is the same as ours.
//config: Another problem is that s_client prints debug information
//config: to stderr, and it needs to be suppressed. This means
//config: all error messages get suppressed too.
//config: openssl is also a big binary, often dynamically linked
//config: against ~15 libraries.
//config:
//config: If openssl can't be executed, internal TLS code will be used
//config: (if you enabled it); if openssl can be executed but fails later,
//config: wget can't detect this, and download will fail.
//applet:IF_WGET(APPLET(wget, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_WGET) += wget.o
//usage:#define wget_trivial_usage
//usage: IF_FEATURE_WGET_LONG_OPTIONS(
//usage: "[-c|--continue] [--spider] [-q|--quiet] [-O|--output-document FILE]\n"
//usage: " [--header 'header: value'] [-Y|--proxy on/off] [-P DIR]\n"
/* Since we ignore these opts, we don't show them in --help */
/* //usage: " [--no-check-certificate] [--no-cache] [--passive-ftp] [-t TRIES]" */
/* //usage: " [-nv] [-nc] [-nH] [-np]" */
//usage: " [-S|--server-response] [-U|--user-agent AGENT]" IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
//usage: )
//usage: IF_NOT_FEATURE_WGET_LONG_OPTIONS(
//usage: "[-cq] [-O FILE] [-Y on/off] [-P DIR] [-S] [-U AGENT]"
//usage: IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
//usage: )
//usage:#define wget_full_usage "\n\n"
//usage: "Retrieve files via HTTP or FTP\n"
//usage: IF_FEATURE_WGET_LONG_OPTIONS(
//usage: "\n --spider Only check URL existence: $? is 0 if exists"
///////: "\n --no-check-certificate Don't validate the server's certificate"
//usage: )
//usage: "\n -c Continue retrieval of aborted transfer"
//usage: "\n -q Quiet"
//usage: "\n -P DIR Save to DIR (default .)"
//usage: "\n -S Show server response"
//usage: IF_FEATURE_WGET_TIMEOUT(
//usage: "\n -T SEC Network read timeout is SEC seconds"
//usage: )
//usage: "\n -O FILE Save to FILE ('-' for stdout)"
//usage: "\n -U STR Use STR for User-Agent header"
//usage: "\n -Y on/off Use proxy"
#include "libbb.h"
#if 0
# define log_io(...) bb_error_msg(__VA_ARGS__)
# define SENDFMT(fp, fmt, ...) \
do { \
log_io("> " fmt, ##__VA_ARGS__); \
fprintf(fp, fmt, ##__VA_ARGS__); \
} while (0);
#else
# define log_io(...) ((void)0)
# define SENDFMT(fp, fmt, ...) fprintf(fp, fmt, ##__VA_ARGS__)
#endif
#define SSL_SUPPORTED (ENABLE_FEATURE_WGET_OPENSSL || ENABLE_FEATURE_WGET_HTTPS)
struct host_info {
char *allocated;
const char *path;
char *user;
const char *protocol;
char *host;
int port;
};
static const char P_FTP[] ALIGN1 = "ftp";
static const char P_HTTP[] ALIGN1 = "http";
#if SSL_SUPPORTED
# if ENABLE_FEATURE_WGET_HTTPS
static const char P_FTPS[] ALIGN1 = "ftps";
# endif
static const char P_HTTPS[] ALIGN1 = "https";
#endif
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
/* User-specified headers prevent using our corresponding built-in headers. */
enum {
HDR_HOST = (1<<0),
HDR_USER_AGENT = (1<<1),
HDR_RANGE = (1<<2),
HDR_AUTH = (1<<3) * ENABLE_FEATURE_WGET_AUTHENTICATION,
HDR_PROXY_AUTH = (1<<4) * ENABLE_FEATURE_WGET_AUTHENTICATION,
};
static const char wget_user_headers[] ALIGN1 =
"Host:\0"
"User-Agent:\0"
"Range:\0"
# if ENABLE_FEATURE_WGET_AUTHENTICATION
"Authorization:\0"
"Proxy-Authorization:\0"
# endif
;
# define USR_HEADER_HOST (G.user_headers & HDR_HOST)
# define USR_HEADER_USER_AGENT (G.user_headers & HDR_USER_AGENT)
# define USR_HEADER_RANGE (G.user_headers & HDR_RANGE)
# define USR_HEADER_AUTH (G.user_headers & HDR_AUTH)
# define USR_HEADER_PROXY_AUTH (G.user_headers & HDR_PROXY_AUTH)
#else /* No long options, no user-headers :( */
# define USR_HEADER_HOST 0
# define USR_HEADER_USER_AGENT 0
# define USR_HEADER_RANGE 0
# define USR_HEADER_AUTH 0
# define USR_HEADER_PROXY_AUTH 0
#endif
/* Globals */
struct globals {
off_t content_len; /* Content-length of the file */
off_t beg_range; /* Range at which continue begins */
#if ENABLE_FEATURE_WGET_STATUSBAR
off_t transferred; /* Number of bytes transferred so far */
const char *curfile; /* Name of current file being transferred */
bb_progress_t pmt;
#endif
char *dir_prefix;
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
char *post_data;
char *extra_headers;
unsigned char user_headers; /* Headers mentioned by the user */
#endif
char *fname_out; /* where to direct output (-O) */
const char *proxy_flag; /* Use proxies if env vars are set */
const char *user_agent; /* "User-Agent" header field */
int output_fd;
int o_flags;
#if ENABLE_FEATURE_WGET_TIMEOUT
unsigned timeout_seconds;
smallint die_if_timed_out;
#endif
smallint chunked; /* chunked transfer encoding */
smallint got_clen; /* got content-length: from server */
/* Local downloads do benefit from big buffer.
* With 512 byte buffer, it was measured to be
* an order of magnitude slower than with big one.
*/
char wget_buf[CONFIG_FEATURE_COPYBUF_KB*1024] ALIGNED(sizeof(long));
} FIX_ALIASING;
#define G (*ptr_to_globals)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
#define FINI_G() do { \
FREE_PTR_TO_GLOBALS(); \
} while (0)
/* Must match option string! */
enum {
WGET_OPT_CONTINUE = (1 << 0),
WGET_OPT_QUIET = (1 << 1),
WGET_OPT_SERVER_RESPONSE = (1 << 2),
WGET_OPT_OUTNAME = (1 << 3),
WGET_OPT_PREFIX = (1 << 4),
WGET_OPT_PROXY = (1 << 5),
WGET_OPT_USER_AGENT = (1 << 6),
WGET_OPT_NETWORK_READ_TIMEOUT = (1 << 7),
WGET_OPT_RETRIES = (1 << 8),
WGET_OPT_nsomething = (1 << 9),
WGET_OPT_HEADER = (1 << 10) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
WGET_OPT_POST_DATA = (1 << 11) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
WGET_OPT_SPIDER = (1 << 12) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
WGET_OPT_NO_CHECK_CERT = (1 << 13) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
};
enum {
PROGRESS_START = -1,
PROGRESS_END = 0,
PROGRESS_BUMP = 1,
};
#if ENABLE_FEATURE_WGET_STATUSBAR
static void progress_meter(int flag)
{
int notty;
if (option_mask32 & WGET_OPT_QUIET)
return;
if (flag == PROGRESS_START)
bb_progress_init(&G.pmt, G.curfile);
notty = bb_progress_update(&G.pmt,
G.beg_range,
G.transferred,
(G.chunked || !G.got_clen) ? 0 : G.beg_range + G.transferred + G.content_len
);
if (flag == PROGRESS_END) {
bb_progress_free(&G.pmt);
if (notty == 0)
bb_putchar_stderr('\n'); /* it's tty */
G.transferred = 0;
}
}
#else
static ALWAYS_INLINE void progress_meter(int flag UNUSED_PARAM) { }
2000-10-03 05:51:45 +05:30
#endif
/* IPv6 knows scoped address types i.e. link and site local addresses. Link
* local addresses can have a scope identifier to specify the
* interface/link an address is valid on (e.g. fe80::1%eth0). This scope
* identifier is only valid on a single node.
*
* RFC 4007 says that the scope identifier MUST NOT be sent across the wire,
* unless all nodes agree on the semantic. Apache e.g. regards zone identifiers
* in the Host header as invalid requests, see
* https://issues.apache.org/bugzilla/show_bug.cgi?id=35122
*/
static void strip_ipv6_scope_id(char *host)
{
char *scope, *cp;
/* bbox wget actually handles IPv6 addresses without [], like
* wget "http://::1/xxx", but this is not standard.
* To save code, _here_ we do not support it. */
if (host[0] != '[')
return; /* not IPv6 */
scope = strchr(host, '%');
if (!scope)
return;
/* Remove the IPv6 zone identifier from the host address */
cp = strchr(host, ']');
if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
/* malformed address (not "[xx]:nn" or "[xx]") */
return;
}
/* cp points to "]...", scope points to "%eth0]..." */
overlapping_strcpy(scope, cp);
}
#if ENABLE_FEATURE_WGET_AUTHENTICATION
/* Base64-encode character string. */
static char *base64enc(const char *str)
{
/* paranoia */
unsigned len = strnlen(str, sizeof(G.wget_buf)/4*3 - 10);
bb_uuencode(G.wget_buf, str, len, bb_uuenc_tbl_base64);
return G.wget_buf;
}
#endif
#if ENABLE_FEATURE_WGET_TIMEOUT
static void alarm_handler(int sig UNUSED_PARAM)
{
/* This is theoretically unsafe (uses stdio and malloc in signal handler) */
if (G.die_if_timed_out)
bb_error_msg_and_die("download timed out");
}
static void set_alarm(void)
{
if (G.timeout_seconds) {
alarm(G.timeout_seconds);
G.die_if_timed_out = 1;
}
}
# define clear_alarm() ((void)(G.die_if_timed_out = 0))
#else
# define set_alarm() ((void)0)
# define clear_alarm() ((void)0)
#endif
#if ENABLE_FEATURE_WGET_OPENSSL
/*
* is_ip_address() attempts to verify whether or not a string
* contains an IPv4 or IPv6 address (vs. an FQDN). The result
* of inet_pton() can be used to determine this.
*
* TODO add proper error checking when inet_pton() returns -1
* (some form of system error has occurred, and errno is set)
*/
static int is_ip_address(const char *string)
{
struct sockaddr_in sa;
int result = inet_pton(AF_INET, string, &(sa.sin_addr));
# if ENABLE_FEATURE_IPV6
if (result == 0) {
struct sockaddr_in6 sa6;
result = inet_pton(AF_INET6, string, &(sa6.sin6_addr));
}
# endif
return (result == 1);
}
#endif
static FILE *open_socket(len_and_sockaddr *lsa)
{
int fd;
FILE *fp;
set_alarm();
fd = xconnect_stream(lsa);
clear_alarm();
/* glibc 2.4 seems to try seeking on it - ??! */
/* hopefully it understands what ESPIPE means... */
fp = fdopen(fd, "r+");
if (!fp)
bb_die_memory_exhausted();
return fp;
}
/* We balk at any control chars in other side's messages.
* This prevents nasty surprises (e.g. ESC sequences) in "Location:" URLs
* and error messages.
*
* The only exception is tabs, which are converted to (one) space:
* HTTP's "headers: <whitespace> values" may have those.
*/
static char* sanitize_string(char *s)
{
unsigned char *p = (void *) s;
while (*p) {
if (*p < ' ') {
if (*p != '\t')
break;
*p = ' ';
}
p++;
}
*p = '\0';
return s;
}
/* Returns '\n' if it was seen, else '\0'. Trims at first '\r' or '\n' */
static char fgets_trim_sanitize(FILE *fp, const char *fmt)
{
char c;
char *buf_ptr;
set_alarm();
if (fgets(G.wget_buf, sizeof(G.wget_buf), fp) == NULL)
bb_perror_msg_and_die("error getting response");
clear_alarm();
buf_ptr = strchrnul(G.wget_buf, '\n');
c = *buf_ptr;
#if 1
/* Disallow any control chars: trim at first char < 0x20 */
sanitize_string(G.wget_buf);
#else
*buf_ptr = '\0';
buf_ptr = strchrnul(G.wget_buf, '\r');
*buf_ptr = '\0';
#endif
log_io("< %s", G.wget_buf);
if (fmt && (option_mask32 & WGET_OPT_SERVER_RESPONSE))
fprintf(stderr, fmt, G.wget_buf);
return c;
}
static int ftpcmd(const char *s1, const char *s2, FILE *fp)
{
int result;
if (s1) {
if (!s2)
s2 = "";
fprintf(fp, "%s%s\r\n", s1, s2);
/* With --server-response, wget also shows its ftp commands */
if (option_mask32 & WGET_OPT_SERVER_RESPONSE)
fprintf(stderr, "--> %s%s\n\n", s1, s2);
fflush(fp);
log_io("> %s%s", s1, s2);
}
/* Read until "Nxx something" is received */
G.wget_buf[3] = 0;
do {
fgets_trim_sanitize(fp, "%s\n");
} while (!isdigit(G.wget_buf[0]) || G.wget_buf[3] != ' ');
G.wget_buf[3] = '\0';
result = xatoi_positive(G.wget_buf);
G.wget_buf[3] = ' ';
return result;
}
static void parse_url(const char *src_url, struct host_info *h)
{
char *url, *p, *sp;
free(h->allocated);
h->allocated = url = xstrdup(src_url);
h->protocol = P_FTP;
p = strstr(url, "://");
if (p) {
*p = '\0';
h->host = p + 3;
if (strcmp(url, P_FTP) == 0) {
h->port = bb_lookup_std_port(P_FTP, "tcp", 21);
} else
#if SSL_SUPPORTED
# if ENABLE_FEATURE_WGET_HTTPS
if (strcmp(url, P_FTPS) == 0) {
h->port = bb_lookup_std_port(P_FTPS, "tcp", 990);
h->protocol = P_FTPS;
} else
# endif
if (strcmp(url, P_HTTPS) == 0) {
h->port = bb_lookup_std_port(P_HTTPS, "tcp", 443);
h->protocol = P_HTTPS;
} else
#endif
if (strcmp(url, P_HTTP) == 0) {
http:
h->port = bb_lookup_std_port(P_HTTP, "tcp", 80);
h->protocol = P_HTTP;
} else {
*p = ':';
bb_error_msg_and_die("not an http or ftp url: %s", url);
}
} else {
// GNU wget is user-friendly and falls back to http://
h->host = url;
goto http;
}
// FYI:
// "Real" wget 'http://busybox.net?var=a/b' sends this request:
// 'GET /?var=a/b HTTP/1.0'
// and saves 'index.html?var=a%2Fb' (we save 'b')
// wget 'http://busybox.net?login=john@doe':
// request: 'GET /?login=john@doe HTTP/1.0'
// saves: 'index.html?login=john@doe' (we save 'login=john@doe')
// wget 'http://busybox.net#test/test':
// request: 'GET / HTTP/1.0'
// saves: 'index.html' (we save 'test')
//
// We also don't add unique .N suffix if file exists...
sp = strchr(h->host, '/');
p = strchr(h->host, '?'); if (!sp || (p && sp > p)) sp = p;
p = strchr(h->host, '#'); if (!sp || (p && sp > p)) sp = p;
if (!sp) {
h->path = "";
} else if (*sp == '/') {
*sp = '\0';
h->path = sp + 1;
} else {
// sp points to '#' or '?'
// Note:
// http://busybox.net?login=john@doe is a valid URL
// (without '/' between ".net" and "?"),
// can't store NUL at sp[-1] - this destroys hostname.
*sp++ = '\0';
h->path = sp;
}
sp = strrchr(h->host, '@');
if (sp != NULL) {
// URL-decode "user:password" string before base64-encoding:
// wget http://test:my%20pass@example.com should send
// Authorization: Basic dGVzdDpteSBwYXNz
// which decodes to "test:my pass".
// Standard wget and curl do this too.
*sp = '\0';
free(h->user);
h->user = xstrdup(percent_decode_in_place(h->host, /*strict:*/ 0));
h->host = sp + 1;
}
/* else: h->user remains NULL, or as set by original request
* before redirect (if we are here after a redirect).
*/
}
static char *get_sanitized_hdr(FILE *fp)
{
char *s, *hdrval;
int c;
/* retrieve header line */
c = fgets_trim_sanitize(fp, " %s\n");
/* end of the headers? */
if (G.wget_buf[0] == '\0')
return NULL;
/* convert the header name to lower case */
for (s = G.wget_buf; isalnum(*s) || *s == '-' || *s == '.' || *s == '_'; ++s) {
/*
* No-op for 20-3f and 60-7f. "0-9a-z-." are in these ranges.
* 40-5f range ("@A-Z[\]^_") maps to 60-7f.
* "A-Z" maps to "a-z".
* "@[\]" can't occur in header names.
* "^_" maps to "~,DEL" (which is wrong).
* "^" was never seen yet, "_" was seen from web.archive.org
* (x-archive-orig-x_commoncrawl_Signature: HEXSTRING).
*/
*s |= 0x20;
}
/* verify we are at the end of the header name */
if (*s != ':')
bb_error_msg_and_die("bad header line: %s", G.wget_buf);
/* locate the start of the header value */
*s++ = '\0';
hdrval = skip_whitespace(s);
if (c != '\n') {
/* Rats! The buffer isn't big enough to hold the entire header value */
while (c = getc(fp), c != EOF && c != '\n')
continue;
}
return hdrval;
}
static void reset_beg_range_to_zero(void)
{
bb_error_msg("restart failed");
G.beg_range = 0;
xlseek(G.output_fd, 0, SEEK_SET);
/* Done at the end instead: */
/* ftruncate(G.output_fd, 0); */
}
#if ENABLE_FEATURE_WGET_OPENSSL
static int spawn_https_helper_openssl(const char *host, unsigned port)
{
char *allocated = NULL;
char *servername;
int sp[2];
int pid;
IF_FEATURE_WGET_HTTPS(volatile int child_failed = 0;)
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) != 0)
/* Kernel can have AF_UNIX support disabled */
bb_perror_msg_and_die("socketpair");
if (!strchr(host, ':'))
host = allocated = xasprintf("%s:%u", host, port);
servername = xstrdup(host);
strrchr(servername, ':')[0] = '\0';
fflush_all();
pid = xvfork();
if (pid == 0) {
/* Child */
char *argv[8];
close(sp[0]);
xmove_fd(sp[1], 0);
xdup2(0, 1);
/*
* openssl s_client -quiet -connect www.kernel.org:443 2>/dev/null
* It prints some debug stuff on stderr, don't know how to suppress it.
* Work around by dev-nulling stderr. We lose all error messages :(
*/
xmove_fd(2, 3);
xopen("/dev/null", O_RDWR);
memset(&argv, 0, sizeof(argv));
argv[0] = (char*)"openssl";
argv[1] = (char*)"s_client";
argv[2] = (char*)"-quiet";
argv[3] = (char*)"-connect";
argv[4] = (char*)host;
/*
* Per RFC 6066 Section 3, the only permitted values in the
* TLS server_name (SNI) field are FQDNs (DNS hostnames).
* IPv4 and IPv6 addresses, port numbers are not allowed.
*/
if (!is_ip_address(servername)) {
argv[5] = (char*)"-servername";
argv[6] = (char*)servername;
}
BB_EXECVP(argv[0], argv);
xmove_fd(3, 2);
# if ENABLE_FEATURE_WGET_HTTPS
child_failed = 1;
xfunc_die();
# else
bb_perror_msg_and_die("can't execute '%s'", argv[0]);
# endif
/* notreached */
}
/* Parent */
free(servername);
free(allocated);
close(sp[1]);
# if ENABLE_FEATURE_WGET_HTTPS
if (child_failed) {
close(sp[0]);
return -1;
}
# endif
return sp[0];
}
#endif
#if ENABLE_FEATURE_WGET_HTTPS
static void spawn_ssl_client(const char *host, int network_fd, int flags)
{
int sp[2];
int pid;
char *servername, *p;
if (!(option_mask32 & WGET_OPT_NO_CHECK_CERT)) {
option_mask32 |= WGET_OPT_NO_CHECK_CERT;
bb_error_msg("note: TLS certificate validation not implemented");
}
servername = xstrdup(host);
p = strrchr(servername, ':');
if (p) *p = '\0';
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) != 0)
/* Kernel can have AF_UNIX support disabled */
bb_perror_msg_and_die("socketpair");
fflush_all();
pid = BB_MMU ? xfork() : xvfork();
if (pid == 0) {
/* Child */
close(sp[0]);
xmove_fd(sp[1], 0);
xdup2(0, 1);
if (BB_MMU) {
tls_state_t *tls = new_tls_state();
tls->ifd = tls->ofd = network_fd;
tls_handshake(tls, servername);
tls_run_copy_loop(tls, flags);
exit(0);
} else {
char *argv[6];
xmove_fd(network_fd, 3);
argv[0] = (char*)"ssl_client";
argv[1] = (char*)"-s3";
//TODO: if (!is_ip_address(servername))...
argv[2] = (char*)"-n";
argv[3] = servername;
argv[4] = (flags & TLSLOOP_EXIT_ON_LOCAL_EOF ? (char*)"-e" : NULL);
argv[5] = NULL;
BB_EXECVP(argv[0], argv);
bb_perror_msg_and_die("can't execute '%s'", argv[0]);
}
/* notreached */
}
/* Parent */
free(servername);
close(sp[1]);
xmove_fd(sp[0], network_fd);
}
#endif
static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_sockaddr *lsa)
{
FILE *sfp;
char *pass;
int port;
sfp = open_socket(lsa);
#if ENABLE_FEATURE_WGET_HTTPS
if (target->protocol == P_FTPS)
spawn_ssl_client(target->host, fileno(sfp), TLSLOOP_EXIT_ON_LOCAL_EOF);
#endif
if (ftpcmd(NULL, NULL, sfp) != 220)
bb_error_msg_and_die("%s", G.wget_buf);
/* note: ftpcmd() sanitizes G.wget_buf, ok to print */
/* Split username:password pair */
pass = (char*)"busybox"; /* password for "anonymous" */
if (target->user) {
pass = strchr(target->user, ':');
if (pass)
*pass++ = '\0';
}
/* Log in */
switch (ftpcmd("USER ", target->user ?: "anonymous", sfp)) {
case 230:
break;
case 331:
if (ftpcmd("PASS ", pass, sfp) == 230)
break;
/* fall through (failed login) */
default:
bb_error_msg_and_die("ftp login: %s", G.wget_buf);
}
ftpcmd("TYPE I", NULL, sfp);
/* Query file size */
if (ftpcmd("SIZE ", target->path, sfp) == 213) {
G.content_len = BB_STRTOOFF(G.wget_buf + 4, NULL, 10);
if (G.content_len < 0 || errno) {
bb_error_msg_and_die("bad SIZE value '%s'", G.wget_buf + 4);
}
G.got_clen = 1;
}
/* Enter passive mode */
if (ENABLE_FEATURE_IPV6 && ftpcmd("EPSV", NULL, sfp) == 229) {
/* good */
} else
if (ftpcmd("PASV", NULL, sfp) != 227) {
pasv_error:
bb_error_msg_and_die("bad response to %s: %s", "PASV", G.wget_buf);
}
port = parse_pasv_epsv(G.wget_buf);
if (port < 0)
goto pasv_error;
set_nport(&lsa->u.sa, htons(port));
*dfpp = open_socket(lsa);
#if ENABLE_FEATURE_WGET_HTTPS
if (target->protocol == P_FTPS) {
/* "PROT P" enables encryption of data stream.
* Without it (or with "PROT C"), data is sent unencrypted.
*/
if (ftpcmd("PROT P", NULL, sfp) == 200)
spawn_ssl_client(target->host, fileno(*dfpp), /*flags*/ 0);
}
#endif
if (G.beg_range != 0) {
sprintf(G.wget_buf, "REST %"OFF_FMT"u", G.beg_range);
if (ftpcmd(G.wget_buf, NULL, sfp) == 350)
G.content_len -= G.beg_range;
else
reset_beg_range_to_zero();
}
//TODO: needs ftp-escaping 0xff and '\n' bytes here.
//Or disallow '\n' altogether via sanitize_string() in parse_url().
//But 0xff's are possible in valid utf8 filenames.
if (ftpcmd("RETR ", target->path, sfp) > 150)
bb_error_msg_and_die("bad response to %s: %s", "RETR", G.wget_buf);
return sfp;
}
static void NOINLINE retrieve_file_data(FILE *dfp)
{
#if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
# if ENABLE_FEATURE_WGET_TIMEOUT
unsigned second_cnt = G.timeout_seconds;
# endif
struct pollfd polldata;
polldata.fd = fileno(dfp);
polldata.events = POLLIN | POLLPRI;
#endif
progress_meter(PROGRESS_START);
if (G.chunked)
goto get_clen;
/* Loops only if chunked */
while (1) {
#if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
/* Must use nonblocking I/O, otherwise fread will loop
* and *block* until it reads full buffer,
* which messes up progress bar and/or timeout logic.
* Because of nonblocking I/O, we need to dance
* very carefully around EAGAIN. See explanation at
* clearerr() calls.
*/
ndelay_on(polldata.fd);
#endif
while (1) {
int n;
unsigned rdsz;
#if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
/* fread internally uses read loop, which in our case
* is usually exited when we get EAGAIN.
* In this case, libc sets error marker on the stream.
* Need to clear it before next fread to avoid possible
* rare false positive ferror below. Rare because usually
* fread gets more than zero bytes, and we don't fall
* into if (n <= 0) ...
*/
clearerr(dfp);
#endif
errno = 0;
rdsz = sizeof(G.wget_buf);
if (G.got_clen) {
if (G.content_len < (off_t)sizeof(G.wget_buf)) {
if ((int)G.content_len <= 0)
break;
rdsz = (unsigned)G.content_len;
}
}
n = fread(G.wget_buf, 1, rdsz, dfp);
if (n > 0) {
xwrite(G.output_fd, G.wget_buf, n);
#if ENABLE_FEATURE_WGET_STATUSBAR
G.transferred += n;
#endif
if (G.got_clen) {
G.content_len -= n;
if (G.content_len == 0)
break;
}
#if ENABLE_FEATURE_WGET_TIMEOUT
second_cnt = G.timeout_seconds;
#endif
goto bump;
}
/* n <= 0.
* man fread:
* If error occurs, or EOF is reached, the return value
* is a short item count (or zero).
* fread does not distinguish between EOF and error.
*/
if (errno != EAGAIN) {
if (ferror(dfp)) {
progress_meter(PROGRESS_END);
bb_perror_msg_and_die(bb_msg_read_error);
}
break; /* EOF, not error */
}
#if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
/* It was EAGAIN. There is no data. Wait up to one second
* then abort if timed out, or update the bar and try reading again.
*/
if (safe_poll(&polldata, 1, 1000) == 0) {
# if ENABLE_FEATURE_WGET_TIMEOUT
if (second_cnt != 0 && --second_cnt == 0) {
progress_meter(PROGRESS_END);
bb_error_msg_and_die("download timed out");
}
# endif
/* We used to loop back to poll here,
* but there is no great harm in letting fread
* to try reading anyway.
*/
}
#endif
bump:
/* Need to do it _every_ second for "stalled" indicator
* to be shown properly.
*/
progress_meter(PROGRESS_BUMP);
} /* while (reading data) */
#if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
clearerr(dfp);
ndelay_off(polldata.fd); /* else fgets can get very unhappy */
#endif
if (!G.chunked)
break;
/* Each chunk ends with "\r\n" - eat it */
fgets_trim_sanitize(dfp, NULL);
get_clen:
/* chunk size format is "HEXNUM[;name[=val]]\r\n" */
fgets_trim_sanitize(dfp, NULL);
errno = 0;
G.content_len = STRTOOFF(G.wget_buf, NULL, 16);
/*
* Had a bug with inputs like "ffffffff0001f400"
* smashing the heap later. Ensure >= 0.
*/
if (G.content_len < 0 || errno)
bb_error_msg_and_die("bad chunk length '%s'", G.wget_buf);
if (G.content_len == 0)
break; /* all done! */
G.got_clen = 1;
/*
* Note that fgets may result in some data being buffered in dfp.
* We loop back to fread, which will retrieve this data.
* Also note that code has to be arranged so that fread
* is done _before_ one-second poll wait - poll doesn't know
* about stdio buffering and can result in spurious one second waits!
*/
}
/* If -c failed, we restart from the beginning,
* but we do not truncate file then, we do it only now, at the end.
* This lets user to ^C if his 99% complete 10 GB file download
* failed to restart *without* losing the almost complete file.
*/
{
off_t pos = lseek(G.output_fd, 0, SEEK_CUR);
if (pos != (off_t)-1)
ftruncate(G.output_fd, pos);
}
/* Draw full bar and free its resources */
G.chunked = 0; /* makes it show 100% even for chunked download */
G.got_clen = 1; /* makes it show 100% even for download of (formerly) unknown size */
progress_meter(PROGRESS_END);
}
static void download_one_url(const char *url)
{
bool use_proxy; /* Use proxies if env vars are set */
int redir_limit;
len_and_sockaddr *lsa;
FILE *sfp; /* socket to web/ftp server */
FILE *dfp; /* socket to ftp server (data) */
char *fname_out_alloc;
char *redirected_path = NULL;
struct host_info server;
struct host_info target;
server.allocated = NULL;
target.allocated = NULL;
server.user = NULL;
target.user = NULL;
parse_url(url, &target);
/* Use the proxy if necessary */
use_proxy = (strcmp(G.proxy_flag, "off") != 0);
if (use_proxy) {
char *proxy = getenv(target.protocol[0] == 'f' ? "ftp_proxy" : "http_proxy");
//FIXME: what if protocol is https? Ok to use http_proxy?
use_proxy = (proxy && proxy[0]);
if (use_proxy)
parse_url(proxy, &server);
}
if (!use_proxy) {
server.protocol = target.protocol;
server.port = target.port;
if (ENABLE_FEATURE_IPV6) {
//free(server.allocated); - can't be non-NULL
server.host = server.allocated = xstrdup(target.host);
} else {
server.host = target.host;
}
}
if (ENABLE_FEATURE_IPV6)
strip_ipv6_scope_id(target.host);
/* If there was no -O FILE, guess output filename */
fname_out_alloc = NULL;
if (!(option_mask32 & WGET_OPT_OUTNAME)) {
G.fname_out = bb_get_last_path_component_nostrip(target.path);
/* handle "wget http://kernel.org//" */
if (G.fname_out[0] == '/' || !G.fname_out[0])
G.fname_out = (char*)"index.html";
/* -P DIR is considered only if there was no -O FILE */
if (G.dir_prefix)
G.fname_out = fname_out_alloc = concat_path_file(G.dir_prefix, G.fname_out);
else {
/* redirects may free target.path later, need to make a copy */
G.fname_out = fname_out_alloc = xstrdup(G.fname_out);
}
}
#if ENABLE_FEATURE_WGET_STATUSBAR
G.curfile = bb_get_last_path_component_nostrip(G.fname_out);
#endif
/* Determine where to start transfer */
G.beg_range = 0;
if (option_mask32 & WGET_OPT_CONTINUE) {
G.output_fd = open(G.fname_out, O_WRONLY);
if (G.output_fd >= 0) {
G.beg_range = xlseek(G.output_fd, 0, SEEK_END);
}
/* File doesn't exist. We do not create file here yet.
* We are not sure it exists on remote side */
}
redir_limit = 5;
resolve_lsa:
2007-02-04 08:09:08 +05:30
lsa = xhost2sockaddr(server.host, server.port);
if (!(option_mask32 & WGET_OPT_QUIET)) {
char *s = xmalloc_sockaddr2dotted(&lsa->u.sa);
fprintf(stderr, "Connecting to %s (%s)\n", server.host, s);
free(s);
}
establish_session:
/*G.content_len = 0; - redundant, got_clen = 0 is enough */
G.got_clen = 0;
G.chunked = 0;
if (use_proxy || target.protocol[0] != 'f' /*not ftp[s]*/) {
/*
* HTTP session
*/
char *str;
int status;
/* Open socket to http(s) server */
#if ENABLE_FEATURE_WGET_OPENSSL
/* openssl (and maybe internal TLS) support is configured */
if (server.protocol == P_HTTPS) {
/* openssl-based helper
* Inconvenient API since we can't give it an open fd
*/
int fd = spawn_https_helper_openssl(server.host, server.port);
# if ENABLE_FEATURE_WGET_HTTPS
if (fd < 0) { /* no openssl? try internal */
sfp = open_socket(lsa);
spawn_ssl_client(server.host, fileno(sfp), /*flags*/ 0);
goto socket_opened;
}
# else
/* We don't check for exec("openssl") failure in this case */
# endif
sfp = fdopen(fd, "r+");
if (!sfp)
bb_die_memory_exhausted();
goto socket_opened;
}
sfp = open_socket(lsa);
socket_opened:
#elif ENABLE_FEATURE_WGET_HTTPS
/* Only internal TLS support is configured */
sfp = open_socket(lsa);
if (server.protocol == P_HTTPS)
spawn_ssl_client(server.host, fileno(sfp), /*flags*/ 0);
#else
/* ssl (https) support is not configured */
sfp = open_socket(lsa);
#endif
/* Send HTTP request */
if (use_proxy) {
SENDFMT(sfp, "GET %s://%s/%s HTTP/1.1\r\n",
target.protocol, target.host,
target.path);
} else {
SENDFMT(sfp, "%s /%s HTTP/1.1\r\n",
(option_mask32 & WGET_OPT_POST_DATA) ? "POST" : "GET",
target.path);
}
if (!USR_HEADER_HOST)
SENDFMT(sfp, "Host: %s\r\n", target.host);
if (!USR_HEADER_USER_AGENT)
SENDFMT(sfp, "User-Agent: %s\r\n", G.user_agent);
/* Ask server to close the connection as soon as we are done
* (IOW: we do not intend to send more requests)
*/
SENDFMT(sfp, "Connection: close\r\n");
#if ENABLE_FEATURE_WGET_AUTHENTICATION
if (target.user && !USR_HEADER_AUTH) {
SENDFMT(sfp, "Proxy-Authorization: Basic %s\r\n"+6,
base64enc(target.user));
}
if (use_proxy && server.user && !USR_HEADER_PROXY_AUTH) {
SENDFMT(sfp, "Proxy-Authorization: Basic %s\r\n",
base64enc(server.user));
}
#endif
if (G.beg_range != 0 && !USR_HEADER_RANGE)
SENDFMT(sfp, "Range: bytes=%"OFF_FMT"u-\r\n", G.beg_range);
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
if (G.extra_headers) {
log_io(G.extra_headers);
fputs(G.extra_headers, sfp);
}
if (option_mask32 & WGET_OPT_POST_DATA) {
SENDFMT(sfp,
"Content-Type: application/x-www-form-urlencoded\r\n"
"Content-Length: %u\r\n"
"\r\n"
"%s",
(int) strlen(G.post_data), G.post_data
);
} else
#endif
{
SENDFMT(sfp, "\r\n");
}
fflush(sfp);
/* Tried doing this unconditionally.
* Cloudflare and nginx/1.11.5 are shocked to see SHUT_WR on non-HTTPS.
*/
#if SSL_SUPPORTED
if (target.protocol == P_HTTPS) {
/* If we use SSL helper, keeping our end of the socket open for writing
* makes our end (i.e. the same fd!) readable (EAGAIN instead of EOF)
* even after child closes its copy of the fd.
* This helps:
*/
shutdown(fileno(sfp), SHUT_WR);
}
#endif
/*
* Retrieve HTTP response line and check for "200" status code.
*/
read_response:
fgets_trim_sanitize(sfp, " %s\n");
str = G.wget_buf;
str = skip_non_whitespace(str);
str = skip_whitespace(str);
// FIXME: no error check
// xatou wouldn't work: "200 OK"
status = atoi(str);
switch (status) {
case 0:
case 100:
while (get_sanitized_hdr(sfp) != NULL)
/* eat all remaining headers */;
goto read_response;
/* Success responses */
case 200:
/* fall through */
case 201: /* 201 Created */
/* "The request has been fulfilled and resulted in a new resource being created" */
/* Standard wget is reported to treat this as success */
/* fall through */
case 202: /* 202 Accepted */
/* "The request has been accepted for processing, but the processing has not been completed" */
/* Treat as success: fall through */
case 203: /* 203 Non-Authoritative Information */
/* "Use of this response code is not required and is only appropriate when the response would otherwise be 200 (OK)" */
/* fall through */
case 204: /* 204 No Content */
2008-06-22 21:58:02 +05:30
/*
Response 204 doesn't say "null file", it says "metadata
has changed but data didn't":
"10.2.5 204 No Content
The server has fulfilled the request but does not need to return
an entity-body, and might want to return updated metainformation.
The response MAY include new or updated metainformation in the form
of entity-headers, which if present SHOULD be associated with
the requested variant.
If the client is a user agent, it SHOULD NOT change its document
view from that which caused the request to be sent. This response
is primarily intended to allow input for actions to take place
without causing a change to the user agent's active document view,
although any new or updated metainformation SHOULD be applied
to the document currently in the user agent's active view.
The 204 response MUST NOT include a message-body, and thus
is always terminated by the first empty line after the header fields."
However, in real world it was observed that some web servers
(e.g. Boa/0.94.14rc21) simply use code 204 when file size is zero.
*/
if (G.beg_range != 0) {
/* "Range:..." was not honored by the server.
* Restart download from the beginning.
*/
reset_beg_range_to_zero();
}
break;
/* 205 Reset Content ?? what to do on this ?? */
case 300: /* redirection */
case 301:
case 302:
case 303:
break;
case 206: /* Partial Content */
if (G.beg_range != 0)
/* "Range:..." worked. Good. */
break;
/* Partial Content even though we did not ask for it??? */
/* fall through */
default:
bb_error_msg_and_die("server returned error: %s", G.wget_buf);
}
/*
* Retrieve HTTP headers.
*/
while ((str = get_sanitized_hdr(sfp)) != NULL) {
static const char keywords[] ALIGN1 =
"content-length\0""transfer-encoding\0""location\0";
enum {
KEY_content_length = 1, KEY_transfer_encoding, KEY_location
};
smalluint key;
/* get_sanitized_hdr converted "FOO:" string to lowercase */
/* strip trailing whitespace */
char *s = strchrnul(str, '\0') - 1;
while (s >= str && (*s == ' ' || *s == '\t')) {
*s = '\0';
s--;
}
key = index_in_strings(keywords, G.wget_buf) + 1;
if (key == KEY_content_length) {
G.content_len = BB_STRTOOFF(str, NULL, 10);
if (G.content_len < 0 || errno) {
bb_error_msg_and_die("content-length %s is garbage", str);
}
G.got_clen = 1;
continue;
}
if (key == KEY_transfer_encoding) {
if (strcmp(str_tolower(str), "chunked") != 0)
bb_error_msg_and_die("transfer encoding '%s' is not supported", str);
G.chunked = 1;
}
if (key == KEY_location && status >= 300) {
if (--redir_limit == 0)
bb_error_msg_and_die("too many redirections");
fclose(sfp);
if (str[0] == '/') {
free(redirected_path);
target.path = redirected_path = xstrdup(str + 1);
/* lsa stays the same: it's on the same server */
} else {
parse_url(str, &target);
if (!use_proxy) {
/* server.user remains untouched */
free(server.allocated);
server.allocated = NULL;
server.protocol = target.protocol;
server.host = target.host;
/* strip_ipv6_scope_id(target.host); - no! */
/* we assume remote never gives us IPv6 addr with scope id */
server.port = target.port;
free(lsa);
goto resolve_lsa;
} /* else: lsa stays the same: we use proxy */
}
goto establish_session;
}
}
// if (status >= 300)
// bb_error_msg_and_die("bad redirection (no Location: header from server)");
/* For HTTP, data is pumped over the same connection */
dfp = sfp;
} else {
/*
* FTP session
*/
sfp = prepare_ftp_session(&dfp, &target, lsa);
}
free(lsa);
if (!(option_mask32 & WGET_OPT_SPIDER)) {
if (G.output_fd < 0)
G.output_fd = xopen(G.fname_out, G.o_flags);
retrieve_file_data(dfp);
if (!(option_mask32 & WGET_OPT_OUTNAME)) {
xclose(G.output_fd);
G.output_fd = -1;
}
}
if (dfp != sfp) {
/* It's ftp. Close data connection properly */
fclose(dfp);
if (ftpcmd(NULL, NULL, sfp) != 226)
bb_error_msg_and_die("ftp error: %s", G.wget_buf);
/* ftpcmd("QUIT", NULL, sfp); - why bother? */
}
fclose(sfp);
free(server.allocated);
free(target.allocated);
free(server.user);
free(target.user);
free(fname_out_alloc);
free(redirected_path);
}
int wget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int wget_main(int argc UNUSED_PARAM, char **argv)
{
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
static const char wget_longopts[] ALIGN1 =
/* name, has_arg, val */
"continue\0" No_argument "c"
"quiet\0" No_argument "q"
"server-response\0" No_argument "S"
"output-document\0" Required_argument "O"
"directory-prefix\0" Required_argument "P"
"proxy\0" Required_argument "Y"
"user-agent\0" Required_argument "U"
IF_FEATURE_WGET_TIMEOUT(
"timeout\0" Required_argument "T")
/* Ignored: */
IF_DESKTOP( "tries\0" Required_argument "t")
"header\0" Required_argument "\xff"
"post-data\0" Required_argument "\xfe"
"spider\0" No_argument "\xfd"
"no-check-certificate\0" No_argument "\xfc"
/* Ignored (we always use PASV): */
IF_DESKTOP( "passive-ftp\0" No_argument "\xf0")
/* Ignored (we don't support caching) */
IF_DESKTOP( "no-cache\0" No_argument "\xf0")
IF_DESKTOP( "no-verbose\0" No_argument "\xf0")
IF_DESKTOP( "no-clobber\0" No_argument "\xf0")
IF_DESKTOP( "no-host-directories\0" No_argument "\xf0")
IF_DESKTOP( "no-parent\0" No_argument "\xf0")
;
getopt32: remove applet_long_options FEATURE_GETOPT_LONG made dependent on LONG_OPTS. The folloving options are removed, now LONG_OPTS enables long options for affected applets: FEATURE_ENV_LONG_OPTIONS FEATURE_EXPAND_LONG_OPTIONS FEATURE_UNEXPAND_LONG_OPTIONS FEATURE_MKDIR_LONG_OPTIONS FEATURE_MV_LONG_OPTIONS FEATURE_RMDIR_LONG_OPTIONS FEATURE_ADDGROUP_LONG_OPTIONS FEATURE_ADDUSER_LONG_OPTIONS FEATURE_HWCLOCK_LONG_OPTIONS FEATURE_NSENTER_LONG_OPTS FEATURE_CHCON_LONG_OPTIONS FEATURE_RUNCON_LONG_OPTIONS They either had a small number of long options, or their long options are essential. Example: upstream addgroup and adduser have ONLY longopts, we should probably go further and get rid of non-standard short options. To this end, make addgroup and adduser "select LONG_OPTS". We had this breakage caused by us even in our own package! #if ENABLE_LONG_OPTS || !ENABLE_ADDGROUP /* We try to use --gid, not -g, because "standard" addgroup * has no short option -g, it has only long --gid. */ argv[1] = (char*)"--gid"; #else /* Breaks if system in fact does NOT use busybox addgroup */ argv[1] = (char*)"-g"; #endif xargs: its lone longopt no longer depends on DESKTOP, only on LONG_OPTS. hwclock TODO: get rid of incompatible -t, -l aliases to --systz, --localtime Shorten help texts by omitting long option when short opt alternative exists. Reduction of size comes from the fact that store of an immediate (an address of longopts) to a fixed address (global variable) is a longer insn than pushing that immediate or passing it in a register. This effect is CPU-agnostic. function old new delta getopt32 1350 22 -1328 vgetopt32 - 1318 +1318 getopt32long - 24 +24 tftpd_main 562 567 +5 scan_recursive 376 380 +4 collect_cpu 545 546 +1 date_main 1096 1095 -1 hostname_main 262 259 -3 uname_main 259 255 -4 setpriv_main 362 358 -4 rmdir_main 191 187 -4 mv_main 562 558 -4 ipcalc_main 548 544 -4 ifenslave_main 641 637 -4 gzip_main 192 188 -4 gunzip_main 77 73 -4 fsfreeze_main 81 77 -4 flock_main 318 314 -4 deluser_main 337 333 -4 cp_main 374 370 -4 chown_main 175 171 -4 applet_long_options 4 - -4 xargs_main 894 889 -5 wget_main 2540 2535 -5 udhcpc_main 2767 2762 -5 touch_main 436 431 -5 tar_main 1014 1009 -5 start_stop_daemon_main 1033 1028 -5 sed_main 682 677 -5 script_main 1082 1077 -5 run_parts_main 330 325 -5 rtcwake_main 459 454 -5 od_main 2169 2164 -5 nl_main 201 196 -5 modprobe_main 773 768 -5 mkdir_main 160 155 -5 ls_main 568 563 -5 install_main 773 768 -5 hwclock_main 411 406 -5 getopt_main 622 617 -5 fstrim_main 256 251 -5 env_main 198 193 -5 dumpleases_main 635 630 -5 dpkg_main 3991 3986 -5 diff_main 1355 1350 -5 cryptpw_main 233 228 -5 cpio_main 593 588 -5 conspy_main 1135 1130 -5 chpasswd_main 313 308 -5 adduser_main 887 882 -5 addgroup_main 416 411 -5 ftpgetput_main 351 345 -6 get_terminal_width_height 242 234 -8 expand_main 690 680 -10 static.expand_longopts 18 - -18 static.unexpand_longopts 27 - -27 mkdir_longopts 28 - -28 env_longopts 30 - -30 static.ifenslave_longopts 34 - -34 mv_longopts 46 - -46 static.rmdir_longopts 48 - -48 packed_usage 31739 31687 -52 ------------------------------------------------------------------------------ (add/remove: 2/8 grow/shrink: 3/49 up/down: 1352/-1840) Total: -488 bytes text data bss dec hex filename 915681 485 6880 923046 e15a6 busybox_old 915428 485 6876 922789 e14a5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 20:08:18 +05:30
# define GETOPT32 getopt32long
# define LONGOPTS ,wget_longopts
#else
# define GETOPT32 getopt32
# define LONGOPTS
#endif
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
llist_t *headers_llist = NULL;
#endif
INIT_G();
#if ENABLE_FEATURE_WGET_TIMEOUT
G.timeout_seconds = 900;
signal(SIGALRM, alarm_handler);
#endif
G.proxy_flag = "on"; /* use proxies if env vars are set */
G.user_agent = "Wget"; /* "User-Agent" header field */
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
#endif
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
GETOPT32(argv, "^"
"cqSO:P:Y:U:T:+"
/*ignored:*/ "t:"
/*ignored:*/ "n::"
/* wget has exactly four -n<letter> opts, all of which we can ignore:
* -nv --no-verbose: be moderately quiet (-q is full quiet)
* -nc --no-clobber: abort if exists, neither download to FILE.n nor overwrite FILE
* -nH --no-host-directories: wget -r http://host/ won't create host/
* -np --no-parent
* "n::" above says that we accept -n[ARG].
* Specifying "n:" would be a bug: "-n ARG" would eat ARG!
*/
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
"\0"
"-1" /* at least one URL */
IF_FEATURE_WGET_LONG_OPTIONS(":\xff::") /* --header is a list */
getopt32: remove applet_long_options FEATURE_GETOPT_LONG made dependent on LONG_OPTS. The folloving options are removed, now LONG_OPTS enables long options for affected applets: FEATURE_ENV_LONG_OPTIONS FEATURE_EXPAND_LONG_OPTIONS FEATURE_UNEXPAND_LONG_OPTIONS FEATURE_MKDIR_LONG_OPTIONS FEATURE_MV_LONG_OPTIONS FEATURE_RMDIR_LONG_OPTIONS FEATURE_ADDGROUP_LONG_OPTIONS FEATURE_ADDUSER_LONG_OPTIONS FEATURE_HWCLOCK_LONG_OPTIONS FEATURE_NSENTER_LONG_OPTS FEATURE_CHCON_LONG_OPTIONS FEATURE_RUNCON_LONG_OPTIONS They either had a small number of long options, or their long options are essential. Example: upstream addgroup and adduser have ONLY longopts, we should probably go further and get rid of non-standard short options. To this end, make addgroup and adduser "select LONG_OPTS". We had this breakage caused by us even in our own package! #if ENABLE_LONG_OPTS || !ENABLE_ADDGROUP /* We try to use --gid, not -g, because "standard" addgroup * has no short option -g, it has only long --gid. */ argv[1] = (char*)"--gid"; #else /* Breaks if system in fact does NOT use busybox addgroup */ argv[1] = (char*)"-g"; #endif xargs: its lone longopt no longer depends on DESKTOP, only on LONG_OPTS. hwclock TODO: get rid of incompatible -t, -l aliases to --systz, --localtime Shorten help texts by omitting long option when short opt alternative exists. Reduction of size comes from the fact that store of an immediate (an address of longopts) to a fixed address (global variable) is a longer insn than pushing that immediate or passing it in a register. This effect is CPU-agnostic. function old new delta getopt32 1350 22 -1328 vgetopt32 - 1318 +1318 getopt32long - 24 +24 tftpd_main 562 567 +5 scan_recursive 376 380 +4 collect_cpu 545 546 +1 date_main 1096 1095 -1 hostname_main 262 259 -3 uname_main 259 255 -4 setpriv_main 362 358 -4 rmdir_main 191 187 -4 mv_main 562 558 -4 ipcalc_main 548 544 -4 ifenslave_main 641 637 -4 gzip_main 192 188 -4 gunzip_main 77 73 -4 fsfreeze_main 81 77 -4 flock_main 318 314 -4 deluser_main 337 333 -4 cp_main 374 370 -4 chown_main 175 171 -4 applet_long_options 4 - -4 xargs_main 894 889 -5 wget_main 2540 2535 -5 udhcpc_main 2767 2762 -5 touch_main 436 431 -5 tar_main 1014 1009 -5 start_stop_daemon_main 1033 1028 -5 sed_main 682 677 -5 script_main 1082 1077 -5 run_parts_main 330 325 -5 rtcwake_main 459 454 -5 od_main 2169 2164 -5 nl_main 201 196 -5 modprobe_main 773 768 -5 mkdir_main 160 155 -5 ls_main 568 563 -5 install_main 773 768 -5 hwclock_main 411 406 -5 getopt_main 622 617 -5 fstrim_main 256 251 -5 env_main 198 193 -5 dumpleases_main 635 630 -5 dpkg_main 3991 3986 -5 diff_main 1355 1350 -5 cryptpw_main 233 228 -5 cpio_main 593 588 -5 conspy_main 1135 1130 -5 chpasswd_main 313 308 -5 adduser_main 887 882 -5 addgroup_main 416 411 -5 ftpgetput_main 351 345 -6 get_terminal_width_height 242 234 -8 expand_main 690 680 -10 static.expand_longopts 18 - -18 static.unexpand_longopts 27 - -27 mkdir_longopts 28 - -28 env_longopts 30 - -30 static.ifenslave_longopts 34 - -34 mv_longopts 46 - -46 static.rmdir_longopts 48 - -48 packed_usage 31739 31687 -52 ------------------------------------------------------------------------------ (add/remove: 2/8 grow/shrink: 3/49 up/down: 1352/-1840) Total: -488 bytes text data bss dec hex filename 915681 485 6880 923046 e15a6 busybox_old 915428 485 6876 922789 e14a5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 20:08:18 +05:30
LONGOPTS
, &G.fname_out, &G.dir_prefix,
&G.proxy_flag, &G.user_agent,
IF_FEATURE_WGET_TIMEOUT(&G.timeout_seconds) IF_NOT_FEATURE_WGET_TIMEOUT(NULL),
NULL, /* -t RETRIES */
NULL /* -n[ARG] */
IF_FEATURE_WGET_LONG_OPTIONS(, &headers_llist)
IF_FEATURE_WGET_LONG_OPTIONS(, &G.post_data)
);
#if 0 /* option bits debug */
if (option_mask32 & WGET_OPT_RETRIES) bb_error_msg("-t NUM");
if (option_mask32 & WGET_OPT_nsomething) bb_error_msg("-nsomething");
if (option_mask32 & WGET_OPT_HEADER) bb_error_msg("--header");
if (option_mask32 & WGET_OPT_POST_DATA) bb_error_msg("--post-data");
if (option_mask32 & WGET_OPT_SPIDER) bb_error_msg("--spider");
if (option_mask32 & WGET_OPT_NO_CHECK_CERT) bb_error_msg("--no-check-certificate");
exit(0);
#endif
argv += optind;
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
if (headers_llist) {
int size = 0;
char *hdr;
llist_t *ll = headers_llist;
while (ll) {
size += strlen(ll->data) + 2;
ll = ll->link;
}
G.extra_headers = hdr = xmalloc(size + 1);
while (headers_llist) {
int bit;
const char *words;
size = sprintf(hdr, "%s\r\n",
(char*)llist_pop(&headers_llist));
/* a bit like index_in_substrings but don't match full key */
bit = 1;
words = wget_user_headers;
while (*words) {
if (strstr(hdr, words) == hdr) {
G.user_headers |= bit;
break;
}
bit <<= 1;
words += strlen(words) + 1;
}
hdr += size;
}
}
#endif
G.output_fd = -1;
G.o_flags = O_WRONLY | O_CREAT | O_TRUNC | O_EXCL;
if (G.fname_out) { /* -O FILE ? */
if (LONE_DASH(G.fname_out)) { /* -O - ? */
G.output_fd = 1;
option_mask32 &= ~WGET_OPT_CONTINUE;
}
/* compat with wget: -O FILE can overwrite */
G.o_flags = O_WRONLY | O_CREAT | O_TRUNC;
}
while (*argv)
download_one_url(*argv++);
if (G.output_fd >= 0)
xclose(G.output_fd);
#if ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_WGET_LONG_OPTIONS
free(G.extra_headers);
#endif
FINI_G();
return EXIT_SUCCESS;
}