hush/networking/wget.c
2007-02-17 18:11:45 +00:00

809 lines
21 KiB
C

/* vi: set sw=4 ts=4: */
/*
* wget - retrieve a file using HTTP or FTP
*
* Chip Rosenthal Covad Communications <chip@laserlink.net>
*
*/
/* We want libc to give us xxx64 functions also */
/* http://www.unix.org/version2/whatsnew/lfs20mar.html */
#define _LARGEFILE64_SOURCE 1
#include "busybox.h"
#include <getopt.h> /* for struct option */
struct host_info {
// May be used if we ever will want to free() all xstrdup()s...
/* char *allocated; */
char *host;
int port;
char *path;
int is_ftp;
char *user;
};
static void parse_url(char *url, struct host_info *h);
static FILE *open_socket(len_and_sockaddr *lsa);
static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc);
static int ftpcmd(const char *s1, const char *s2, FILE *fp, char *buf);
/* Globals (can be accessed from signal handlers */
static off_t content_len; /* Content-length of the file */
static off_t beg_range; /* Range at which continue begins */
#if ENABLE_FEATURE_WGET_STATUSBAR
static off_t transferred; /* Number of bytes transferred so far */
#endif
static int chunked; /* chunked transfer encoding */
#if ENABLE_FEATURE_WGET_STATUSBAR
static void progressmeter(int flag);
static const char *curfile; /* Name of current file being transferred */
static struct timeval start; /* Time a transfer started */
enum {
STALLTIME = 5 /* Seconds when xfer considered "stalled" */
};
#else
static void progressmeter(int flag) {}
#endif
/* Read NMEMB elements of SIZE bytes into PTR from STREAM. Returns the
* number of elements read, and a short count if an eof or non-interrupt
* error is encountered. */
static size_t safe_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t ret = 0;
do {
clearerr(stream);
ret += fread((char *)ptr + (ret * size), size, nmemb - ret, stream);
} while (ret < nmemb && ferror(stream) && errno == EINTR);
return ret;
}
/* Read a line or SIZE - 1 bytes into S, whichever is less, from STREAM.
* Returns S, or NULL if an eof or non-interrupt error is encountered. */
static char *safe_fgets(char *s, int size, FILE *stream)
{
char *ret;
do {
clearerr(stream);
ret = fgets(s, size, stream);
} while (ret == NULL && ferror(stream) && errno == EINTR);
return ret;
}
#if ENABLE_FEATURE_WGET_AUTHENTICATION
/*
* Base64-encode character string and return the string.
*/
static char *base64enc(unsigned char *p, char *buf, int len)
{
bb_uuencode(p, buf, len, bb_uuenc_tbl_base64);
return buf;
}
#endif
int wget_main(int argc, char **argv);
int wget_main(int argc, char **argv)
{
char buf[512];
struct host_info server, target;
len_and_sockaddr *lsa;
int n, status;
int port;
int try = 5;
unsigned opt;
char *s;
char *proxy = 0;
char *dir_prefix = NULL;
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
char *extra_headers = NULL;
llist_t *headers_llist = NULL;
#endif
/* server.allocated = target.allocated = NULL; */
FILE *sfp = NULL; /* socket to web/ftp server */
FILE *dfp = NULL; /* socket to ftp server (data) */
char *fname_out = NULL; /* where to direct output (-O) */
int got_clen = 0; /* got content-length: from server */
int output_fd = -1;
int use_proxy = 1; /* Use proxies if env vars are set */
const char *proxy_flag = "on"; /* Use proxies if env vars are set */
const char *user_agent = "Wget";/* Content of the "User-Agent" header field */
/*
* Crack command line.
*/
enum {
WGET_OPT_CONTINUE = 0x1,
WGET_OPT_QUIET = 0x2,
WGET_OPT_OUTNAME = 0x4,
WGET_OPT_PREFIX = 0x8,
WGET_OPT_PROXY = 0x10,
WGET_OPT_USER_AGENT = 0x20,
WGET_OPT_PASSIVE = 0x40,
WGET_OPT_HEADER = 0x80,
};
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
static const struct option wget_long_options[] = {
// name, has_arg, flag, val
{ "continue", no_argument, NULL, 'c' },
{ "quiet", no_argument, NULL, 'q' },
{ "output-document", required_argument, NULL, 'O' },
{ "directory-prefix", required_argument, NULL, 'P' },
{ "proxy", required_argument, NULL, 'Y' },
{ "user-agent", required_argument, NULL, 'U' },
{ "passive-ftp", no_argument, NULL, 0xff },
{ "header", required_argument, NULL, 0xfe },
{ 0, 0, 0, 0 }
};
applet_long_options = wget_long_options;
#endif
opt_complementary = "-1" USE_FEATURE_WGET_LONG_OPTIONS(":\xfe::");
opt = getopt32(argc, argv, "cqO:P:Y:U:",
&fname_out, &dir_prefix,
&proxy_flag, &user_agent
USE_FEATURE_WGET_LONG_OPTIONS(, &headers_llist)
);
if (strcmp(proxy_flag, "off") == 0) {
/* Use the proxy if necessary. */
use_proxy = 0;
}
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
if (headers_llist) {
int size = 1;
char *cp;
llist_t *ll = headers_llist = llist_rev(headers_llist);
while (ll) {
size += strlen(ll->data) + 2;
ll = ll->link;
}
extra_headers = cp = xmalloc(size);
while (headers_llist) {
cp += sprintf(cp, "%s\r\n", headers_llist->data);
headers_llist = headers_llist->link;
}
}
#endif
parse_url(argv[optind], &target);
server.host = target.host;
server.port = target.port;
/*
* Use the proxy if necessary.
*/
if (use_proxy) {
proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
if (proxy && *proxy) {
parse_url(proxy, &server);
} else {
use_proxy = 0;
}
}
/* Guess an output filename */
if (!fname_out) {
// Dirty hack. Needed because bb_get_last_path_component
// will destroy trailing / by storing '\0' in last byte!
if (!last_char_is(target.path, '/')) {
fname_out = bb_get_last_path_component(target.path);
#if ENABLE_FEATURE_WGET_STATUSBAR
curfile = fname_out;
#endif
}
if (!fname_out || !fname_out[0]) {
/* bb_get_last_path_component writes
* to last '/' only. We don't have one here... */
fname_out = (char*)"index.html";
#if ENABLE_FEATURE_WGET_STATUSBAR
curfile = fname_out;
#endif
}
if (dir_prefix != NULL)
fname_out = concat_path_file(dir_prefix, fname_out);
#if ENABLE_FEATURE_WGET_STATUSBAR
} else {
curfile = bb_get_last_path_component(fname_out);
#endif
}
/* Impossible?
if ((opt & WGET_OPT_CONTINUE) && !fname_out)
bb_error_msg_and_die("cannot specify continue (-c) without a filename (-O)"); */
/*
* Determine where to start transfer.
*/
if (LONE_DASH(fname_out)) {
output_fd = 1;
opt &= ~WGET_OPT_CONTINUE;
}
if (opt & WGET_OPT_CONTINUE) {
output_fd = open(fname_out, O_WRONLY);
if (output_fd >= 0) {
beg_range = xlseek(output_fd, 0, SEEK_END);
}
/* File doesn't exist. We do not create file here yet.
We are not sure it exists on remove side */
}
/* We want to do exactly _one_ DNS lookup, since some
* sites (i.e. ftp.us.debian.org) use round-robin DNS
* and we want to connect to only one IP... */
lsa = xhost2sockaddr(server.host, server.port);
if (!(opt & WGET_OPT_QUIET)) {
fprintf(stderr, "Connecting to %s (%s)\n", server.host,
xmalloc_sockaddr2dotted(&lsa->sa, lsa->len));
/* We leak result of xmalloc_sockaddr2dotted */
}
if (use_proxy || !target.is_ftp) {
/*
* HTTP session
*/
do {
got_clen = chunked = 0;
if (!--try)
bb_error_msg_and_die("too many redirections");
/*
* Open socket to http server
*/
if (sfp) fclose(sfp);
sfp = open_socket(lsa);
/*
* Send HTTP request.
*/
if (use_proxy) {
fprintf(sfp, "GET %stp://%s/%s HTTP/1.1\r\n",
target.is_ftp ? "f" : "ht", target.host,
target.path);
} else {
fprintf(sfp, "GET /%s HTTP/1.1\r\n", target.path);
}
fprintf(sfp, "Host: %s\r\nUser-Agent: %s\r\n",
target.host, user_agent);
#if ENABLE_FEATURE_WGET_AUTHENTICATION
if (target.user) {
fprintf(sfp, "Authorization: Basic %s\r\n",
base64enc((unsigned char*)target.user, buf, sizeof(buf)));
}
if (use_proxy && server.user) {
fprintf(sfp, "Proxy-Authorization: Basic %s\r\n",
base64enc((unsigned char*)server.user, buf, sizeof(buf)));
}
#endif
if (beg_range)
fprintf(sfp, "Range: bytes=%"OFF_FMT"d-\r\n", beg_range);
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
if (extra_headers)
fputs(extra_headers, sfp);
#endif
fprintf(sfp, "Connection: close\r\n\r\n");
/*
* Retrieve HTTP response line and check for "200" status code.
*/
read_response:
if (fgets(buf, sizeof(buf), sfp) == NULL)
bb_error_msg_and_die("no response from server");
s = buf;
while (*s != '\0' && !isspace(*s)) ++s;
s = skip_whitespace(s);
// FIXME: no error check
// xatou wouldn't work: "200 OK"
status = atoi(s);
switch (status) {
case 0:
case 100:
while (gethdr(buf, sizeof(buf), sfp, &n) != NULL)
/* eat all remaining headers */;
goto read_response;
case 200:
break;
case 300: /* redirection */
case 301:
case 302:
case 303:
break;
case 206:
if (beg_range)
break;
/*FALLTHRU*/
default:
/* Show first line only and kill any ESC tricks */
buf[strcspn(buf, "\n\r\x1b")] = '\0';
bb_error_msg_and_die("server returned error: %s", buf);
}
/*
* Retrieve HTTP headers.
*/
while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) {
if (strcasecmp(buf, "content-length") == 0) {
content_len = BB_STRTOOFF(s, NULL, 10);
if (errno || content_len < 0) {
bb_error_msg_and_die("content-length %s is garbage", s);
}
got_clen = 1;
continue;
}
if (strcasecmp(buf, "transfer-encoding") == 0) {
if (strcasecmp(s, "chunked") != 0)
bb_error_msg_and_die("server wants to do %s transfer encoding", s);
chunked = got_clen = 1;
}
if (strcasecmp(buf, "location") == 0) {
if (s[0] == '/')
/* free(target.allocated); */
target.path = /* target.allocated = */ xstrdup(s+1);
else {
parse_url(s, &target);
if (use_proxy == 0) {
server.host = target.host;
server.port = target.port;
}
free(lsa);
lsa = xhost2sockaddr(server.host, server.port);
break;
}
}
}
} while (status >= 300);
dfp = sfp;
} else {
/*
* FTP session
*/
if (!target.user)
target.user = xstrdup("anonymous:busybox@");
sfp = open_socket(lsa);
if (ftpcmd(NULL, NULL, sfp, buf) != 220)
bb_error_msg_and_die("%s", buf+4);
/*
* Splitting username:password pair,
* trying to log in
*/
s = strchr(target.user, ':');
if (s)
*(s++) = '\0';
switch (ftpcmd("USER ", target.user, sfp, buf)) {
case 230:
break;
case 331:
if (ftpcmd("PASS ", s, sfp, buf) == 230)
break;
/* FALLTHRU (failed login) */
default:
bb_error_msg_and_die("ftp login: %s", buf+4);
}
ftpcmd("TYPE I", NULL, sfp, buf);
/*
* Querying file size
*/
if (ftpcmd("SIZE ", target.path, sfp, buf) == 213) {
content_len = BB_STRTOOFF(buf+4, NULL, 10);
if (errno || content_len < 0) {
bb_error_msg_and_die("SIZE value is garbage");
}
got_clen = 1;
}
/*
* Entering passive mode
*/
if (ftpcmd("PASV", NULL, sfp, buf) != 227) {
pasv_error:
bb_error_msg_and_die("bad response to %s: %s", "PASV", buf);
}
// Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage]
// Server's IP is N1.N2.N3.N4 (we ignore it)
// Server's port for data connection is P1*256+P2
s = strrchr(buf, ')');
if (s) s[0] = '\0';
s = strrchr(buf, ',');
if (!s) goto pasv_error;
port = xatou_range(s+1, 0, 255);
*s = '\0';
s = strrchr(buf, ',');
if (!s) goto pasv_error;
port += xatou_range(s+1, 0, 255) * 256;
set_nport(lsa, htons(port));
dfp = open_socket(lsa);
if (beg_range) {
sprintf(buf, "REST %"OFF_FMT"d", beg_range);
if (ftpcmd(buf, NULL, sfp, buf) == 350)
content_len -= beg_range;
}
if (ftpcmd("RETR ", target.path, sfp, buf) > 150)
bb_error_msg_and_die("bad response to RETR: %s", buf);
}
/*
* Retrieve file
*/
if (chunked) {
fgets(buf, sizeof(buf), dfp);
content_len = STRTOOFF(buf, NULL, 16);
/* FIXME: error check?? */
}
/* Do it before progressmeter (want to have nice error message) */
if (output_fd < 0)
output_fd = xopen(fname_out,
O_WRONLY|O_CREAT|O_EXCL|O_TRUNC);
if (!(opt & WGET_OPT_QUIET))
progressmeter(-1);
do {
while (content_len > 0 || !got_clen) {
unsigned rdsz = sizeof(buf);
if (content_len < sizeof(buf) && (chunked || got_clen))
rdsz = (unsigned)content_len;
n = safe_fread(buf, 1, rdsz, dfp);
if (n <= 0)
break;
if (full_write(output_fd, buf, n) != n) {
bb_perror_msg_and_die(bb_msg_write_error);
}
#if ENABLE_FEATURE_WGET_STATUSBAR
transferred += n;
#endif
if (got_clen) {
content_len -= n;
}
}
if (chunked) {
safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
safe_fgets(buf, sizeof(buf), dfp);
content_len = STRTOOFF(buf, NULL, 16);
/* FIXME: error check? */
if (content_len == 0) {
chunked = 0; /* all done! */
}
}
if (n == 0 && ferror(dfp)) {
bb_perror_msg_and_die(bb_msg_read_error);
}
} while (chunked);
if (!(opt & WGET_OPT_QUIET))
progressmeter(1);
if ((use_proxy == 0) && target.is_ftp) {
fclose(dfp);
if (ftpcmd(NULL, NULL, sfp, buf) != 226)
bb_error_msg_and_die("ftp error: %s", buf+4);
ftpcmd("QUIT", NULL, sfp, buf);
}
exit(EXIT_SUCCESS);
}
static void parse_url(char *src_url, struct host_info *h)
{
char *url, *p, *sp;
/* h->allocated = */ url = xstrdup(src_url);
if (strncmp(url, "http://", 7) == 0) {
h->port = bb_lookup_port("http", "tcp", 80);
h->host = url + 7;
h->is_ftp = 0;
} else if (strncmp(url, "ftp://", 6) == 0) {
h->port = bb_lookup_port("ftp", "tcp", 21);
h->host = url + 6;
h->is_ftp = 1;
} else
bb_error_msg_and_die("not an http or ftp url: %s", url);
// 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) {
/* must be writable because of bb_get_last_path_component() */
static char nullstr[] = "";
h->path = nullstr;
} else if (*sp == '/') {
*sp = '\0';
h->path = sp + 1;
} else { // '#' or '?'
// http://busybox.net?login=john@doe is a valid URL
// memmove converts to:
// http:/busybox.nett?login=john@doe...
memmove(h->host-1, h->host, sp - h->host);
h->host--;
sp[-1] = '\0';
h->path = sp;
}
sp = strrchr(h->host, '@');
h->user = NULL;
if (sp != NULL) {
h->user = h->host;
*sp = '\0';
h->host = sp + 1;
}
sp = h->host;
}
static FILE *open_socket(len_and_sockaddr *lsa)
{
FILE *fp;
/* glibc 2.4 seems to try seeking on it - ??! */
/* hopefully it understands what ESPIPE means... */
fp = fdopen(xconnect_stream(lsa), "r+");
if (fp == NULL)
bb_perror_msg_and_die("fdopen");
return fp;
}
static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc)
{
char *s, *hdrval;
int c;
*istrunc = 0;
/* retrieve header line */
if (fgets(buf, bufsiz, fp) == NULL)
return NULL;
/* see if we are at the end of the headers */
for (s = buf; *s == '\r'; ++s)
;
if (s[0] == '\n')
return NULL;
/* convert the header name to lower case */
for (s = buf; isalnum(*s) || *s == '-'; ++s)
*s = tolower(*s);
/* verify we are at the end of the header name */
if (*s != ':')
bb_error_msg_and_die("bad header line: %s", buf);
/* locate the start of the header value */
for (*s++ = '\0'; *s == ' ' || *s == '\t'; ++s)
;
hdrval = s;
/* locate the end of header */
while (*s != '\0' && *s != '\r' && *s != '\n')
++s;
/* end of header found */
if (*s != '\0') {
*s = '\0';
return hdrval;
}
/* Rats! The buffer isn't big enough to hold the entire header value. */
while (c = getc(fp), c != EOF && c != '\n')
;
*istrunc = 1;
return hdrval;
}
static int ftpcmd(const char *s1, const char *s2, FILE *fp, char *buf)
{
int result;
if (s1) {
if (!s2) s2 = "";
fprintf(fp, "%s%s\r\n", s1, s2);
fflush(fp);
}
do {
char *buf_ptr;
if (fgets(buf, 510, fp) == NULL) {
bb_perror_msg_and_die("error getting response");
}
buf_ptr = strstr(buf, "\r\n");
if (buf_ptr) {
*buf_ptr = '\0';
}
} while (!isdigit(buf[0]) || buf[3] != ' ');
buf[3] = '\0';
result = xatoi_u(buf);
buf[3] = ' ';
return result;
}
#if ENABLE_FEATURE_WGET_STATUSBAR
/* Stuff below is from BSD rcp util.c, as added to openshh.
* Original copyright notice is retained at the end of this file.
*/
static int
getttywidth(void)
{
int width;
get_terminal_width_height(0, &width, NULL);
return width;
}
static void
updateprogressmeter(int ignore)
{
int save_errno = errno;
progressmeter(0);
errno = save_errno;
}
static void alarmtimer(int iwait)
{
struct itimerval itv;
itv.it_value.tv_sec = iwait;
itv.it_value.tv_usec = 0;
itv.it_interval = itv.it_value;
setitimer(ITIMER_REAL, &itv, NULL);
}
static void
progressmeter(int flag)
{
static struct timeval lastupdate;
static off_t lastsize, totalsize;
struct timeval now, td, tvwait;
off_t abbrevsize;
int elapsed, ratio, barlength, i;
char buf[256];
if (flag == -1) { /* first call to progressmeter */
gettimeofday(&start, (struct timezone *) 0);
lastupdate = start;
lastsize = 0;
totalsize = content_len + beg_range; /* as content_len changes.. */
}
gettimeofday(&now, (struct timezone *) 0);
ratio = 100;
if (totalsize != 0 && !chunked) {
/* long long helps to have working ETA even if !LFS */
ratio = (int) (100 * (unsigned long long)(transferred+beg_range) / totalsize);
ratio = MIN(ratio, 100);
}
fprintf(stderr, "\r%-20.20s%4d%% ", curfile, ratio);
barlength = getttywidth() - 51;
if (barlength > 0 && barlength < sizeof(buf)) {
i = barlength * ratio / 100;
memset(buf, '*', i);
memset(buf + i, ' ', barlength - i);
buf[barlength] = '\0';
fprintf(stderr, "|%s|", buf);
}
i = 0;
abbrevsize = transferred + beg_range;
while (abbrevsize >= 100000) {
i++;
abbrevsize >>= 10;
}
/* see http://en.wikipedia.org/wiki/Tera */
fprintf(stderr, "%6d %c%c ", (int)abbrevsize, " KMGTPEZY"[i], i?'B':' ');
timersub(&now, &lastupdate, &tvwait);
if (transferred > lastsize) {
lastupdate = now;
lastsize = transferred;
if (tvwait.tv_sec >= STALLTIME)
timeradd(&start, &tvwait, &start);
tvwait.tv_sec = 0;
}
timersub(&now, &start, &td);
elapsed = td.tv_sec;
if (tvwait.tv_sec >= STALLTIME) {
fprintf(stderr, " - stalled -");
} else {
off_t to_download = totalsize - beg_range;
if (transferred <= 0 || elapsed <= 0 || transferred > to_download || chunked) {
fprintf(stderr, "--:--:-- ETA");
} else {
/* to_download / (transferred/elapsed) - elapsed: */
int eta = (int) ((unsigned long long)to_download*elapsed/transferred - elapsed);
/* (long long helps to have working ETA even if !LFS) */
i = eta % 3600;
fprintf(stderr, "%02d:%02d:%02d ETA", eta / 3600, i / 60, i % 60);
}
}
if (flag == -1) { /* first call to progressmeter */
struct sigaction sa;
sa.sa_handler = updateprogressmeter;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGALRM, &sa, NULL);
alarmtimer(1);
} else if (flag == 1) { /* last call to progressmeter */
alarmtimer(0);
transferred = 0;
putc('\n', stderr);
}
}
#endif
/* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
* much of which was blatantly stolen from openssh. */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
*
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/