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hush/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>
*
*/
/* 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 */
#ifdef CONFIG_LFS
# define FILEOFF_TYPE off64_t
# define FILEOFF_FMT "%lld"
# define LSEEK lseek64
# define STRTOOFF strtoll
# define SAFE_STRTOOFF safe_strtoll
/* stat64 etc as needed... */
#else
# define FILEOFF_TYPE off_t
# define FILEOFF_FMT "%ld"
# define LSEEK lseek
# define STRTOOFF strtol
# define SAFE_STRTOOFF safe_strtol
/* Do we need to undefine O_LARGEFILE? */
#endif
struct host_info {
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(struct sockaddr_in *s_in);
static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc);
static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf);
/* Globals (can be accessed from signal handlers */
static FILEOFF_TYPE content_len; /* Content-length of the file */
static FILEOFF_TYPE beg_range; /* Range at which continue begins */
static FILEOFF_TYPE transferred; /* Number of bytes transferred so far */
static int chunked; /* chunked transfer encoding */
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
static void progressmeter(int flag);
static 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;
}
#ifdef CONFIG_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
#define WGET_OPT_CONTINUE 1
#define WGET_OPT_QUIET 2
#define WGET_OPT_PASSIVE 4
#define WGET_OPT_OUTNAME 8
#define WGET_OPT_HEADER 16
#define WGET_OPT_PREFIX 32
#define WGET_OPT_PROXY 64
#define WGET_OPT_USER_AGENT 128
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
static const struct option wget_long_options[] = {
{ "continue", 0, NULL, 'c' },
{ "quiet", 0, NULL, 'q' },
{ "passive-ftp", 0, NULL, 139 }, /* FIXME: what is this - 139?? */
{ "output-document", 1, NULL, 'O' },
{ "header", 1, NULL, 131 },
{ "directory-prefix",1, NULL, 'P' },
{ "proxy", 1, NULL, 'Y' },
{ "user-agent", 1, NULL, 'U' },
{ 0, 0, 0, 0 }
};
#endif
int wget_main(int argc, char **argv)
{
int n, try=5, status;
unsigned long opt;
int port;
char *proxy = 0;
char *dir_prefix=NULL;
char *s, buf[512];
char extra_headers[1024];
char *extra_headers_ptr = extra_headers;
int extra_headers_left = sizeof(extra_headers);
struct host_info server, target;
struct sockaddr_in s_in;
llist_t *headers_llist = 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 */
char *proxy_flag = "on"; /* Use proxies if env vars are set */
char *user_agent = "Wget"; /* Content of the "User-Agent" header field */
/*
* Crack command line.
*/
bb_opt_complementally = "-1:\203::";
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
bb_applet_long_options = wget_long_options;
#endif
opt = bb_getopt_ulflags(argc, argv, "cq\213O:\203:P:Y:U:",
&fname_out, &headers_llist,
&dir_prefix, &proxy_flag, &user_agent);
if (strcmp(proxy_flag, "off") == 0) {
/* Use the proxy if necessary. */
use_proxy = 0;
}
if (opt & WGET_OPT_HEADER) {
while (headers_llist) {
int arglen = strlen(headers_llist->data);
if (extra_headers_left - arglen - 2 <= 0)
bb_error_msg_and_die("extra_headers buffer too small "
"(need %i)", extra_headers_left - arglen);
strcpy(extra_headers_ptr, headers_llist->data);
extra_headers_ptr += arglen;
extra_headers_left -= ( arglen + 2 );
*extra_headers_ptr++ = '\r';
*extra_headers_ptr++ = '\n';
*(extra_headers_ptr + 1) = 0;
headers_llist = headers_llist->link;
}
}
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(xstrdup(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 (*target.path && target.path[strlen(target.path)-1] != '/') {
fname_out =
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
curfile =
#endif
bb_get_last_path_component(target.path);
}
if (!fname_out || !fname_out[0]) {
fname_out =
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
curfile =
#endif
"index.html";
}
if (dir_prefix != NULL)
fname_out = concat_path_file(dir_prefix, fname_out);
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
} else {
curfile = bb_get_last_path_component(fname_out);
#endif
}
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 (!strcmp(fname_out, "-")) {
output_fd = 1;
opt |= WGET_OPT_QUIET;
opt &= ~WGET_OPT_CONTINUE;
} else if (opt & WGET_OPT_CONTINUE) {
output_fd = open(fname_out, O_WRONLY|O_LARGEFILE);
if (output_fd >= 0) {
beg_range = LSEEK(output_fd, 0, SEEK_END);
if (beg_range == (FILEOFF_TYPE)-1)
bb_perror_msg_and_die("lseek");
}
/* 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... */
bb_lookup_host(&s_in, server.host);
s_in.sin_port = server.port;
if (!(opt & WGET_OPT_QUIET)) {
printf("Connecting to %s[%s]:%d\n",
server.host, inet_ntoa(s_in.sin_addr), ntohs(server.port));
}
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(&s_in);
/*
* Send HTTP request.
*/
if (use_proxy) {
const char *format = "GET %stp://%s:%d/%s HTTP/1.1\r\n";
#ifdef CONFIG_FEATURE_WGET_IP6_LITERAL
if (strchr(target.host, ':'))
format = "GET %stp://[%s]:%d/%s HTTP/1.1\r\n";
#endif
fprintf(sfp, format,
target.is_ftp ? "f" : "ht", target.host,
ntohs(target.port), 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);
#ifdef CONFIG_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="FILEOFF_FMT"-\r\n", beg_range);
if(extra_headers_left < sizeof(extra_headers))
fputs(extra_headers,sfp);
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");
for (s = buf ; *s != '\0' && !isspace(*s) ; ++s)
;
for ( ; isspace(*s) ; ++s)
;
switch (status = atoi(s)) {
case 0:
case 100:
while (gethdr(buf, sizeof(buf), sfp, &n) != NULL);
goto read_response;
case 200:
break;
case 300: /* redirection */
case 301:
case 302:
case 303:
break;
case 206:
if (beg_range)
break;
/*FALLTHRU*/
default:
chomp(buf);
bb_error_msg_and_die("server returned error %d: %s", atoi(s), buf);
}
/*
* Retrieve HTTP headers.
*/
while ((s = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) {
if (strcasecmp(buf, "content-length") == 0) {
if (SAFE_STRTOOFF(s, &content_len) || 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) {
chunked = got_clen = 1;
} else {
bb_error_msg_and_die("server wants to do %s transfer encoding", s);
}
}
if (strcasecmp(buf, "location") == 0) {
if (s[0] == '/')
target.path = xstrdup(s+1);
else {
parse_url(xstrdup(s), &target);
if (use_proxy == 0) {
server.host = target.host;
server.port = target.port;
}
bb_lookup_host(&s_in, server.host);
s_in.sin_port = server.port;
break;
}
}
}
} while(status >= 300);
dfp = sfp;
}
else
{
/*
* FTP session
*/
if (!target.user)
target.user = xstrdup("anonymous:busybox@");
sfp = open_socket(&s_in);
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) {
if (SAFE_STRTOOFF(buf+4, &content_len) || 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)
bb_error_msg_and_die("PASV: %s", buf+4);
s = strrchr(buf, ',');
*s = 0;
port = atoi(s+1);
s = strrchr(buf, ',');
port += atoi(s+1) * 256;
s_in.sin_port = htons(port);
dfp = open_socket(&s_in);
if (beg_range) {
sprintf(buf, "REST "FILEOFF_FMT, 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("RETR: %s", buf+4);
}
/*
* Retrieve file
*/
if (chunked) {
fgets(buf, sizeof(buf), dfp);
content_len = STRTOOFF(buf, (char **) NULL, 16);
/* FIXME: error check?? */
}
/* Do it before progressmeter (want to have nice error message) */
if (output_fd < 0)
output_fd = xopen3(fname_out,
O_WRONLY|O_CREAT|O_EXCL|O_TRUNC|O_LARGEFILE, 0666);
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);
}
#ifdef CONFIG_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, (char **) 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 *url, struct host_info *h)
{
char *cp, *sp, *up, *pp;
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", "tfp", 21);
h->host = url + 6;
h->is_ftp = 1;
} else
bb_error_msg_and_die("not an http or ftp url: %s", url);
sp = strchr(h->host, '/');
if (sp) {
*sp++ = '\0';
h->path = sp;
} else
h->path = xstrdup("");
up = strrchr(h->host, '@');
if (up != NULL) {
h->user = h->host;
*up++ = '\0';
h->host = up;
} else
h->user = NULL;
pp = h->host;
#ifdef CONFIG_FEATURE_WGET_IP6_LITERAL
if (h->host[0] == '[') {
char *ep;
ep = h->host + 1;
while (*ep == ':' || isxdigit (*ep))
ep++;
if (*ep == ']') {
h->host++;
*ep = '\0';
pp = ep + 1;
}
}
#endif
cp = strchr(pp, ':');
if (cp != NULL) {
*cp++ = '\0';
h->port = htons(atoi(cp));
}
}
static FILE *open_socket(struct sockaddr_in *s_in)
{
FILE *fp;
fp = fdopen(xconnect(s_in), "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(char *s1, char *s2, FILE *fp, char *buf)
{
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("fgets");
}
buf_ptr = strstr(buf, "\r\n");
if (buf_ptr) {
*buf_ptr = '\0';
}
} while (!isdigit(buf[0]) || buf[3] != ' ');
return atoi(buf);
}
#ifdef CONFIG_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=0;
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 FILEOFF_TYPE lastsize, totalsize;
struct timeval now, td, tvwait;
FILEOFF_TYPE abbrevsize;
int elapsed, ratio, barlength, i;
char buf[256];
if (flag == -1) { /* first call to progressmeter */
(void) gettimeofday(&start, (struct timezone *) 0);
lastupdate = start;
lastsize = 0;
totalsize = content_len + beg_range; /* as content_len changes.. */
}
(void) gettimeofday(&now, (struct timezone *) 0);
ratio = 100;
if (totalsize != 0 && !chunked) {
ratio = (int) (100 * (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 {
FILEOFF_TYPE 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) (to_download*elapsed/transferred - elapsed);
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.
*
* $Id: wget.c,v 1.75 2004/10/08 08:27:40 andersen Exp $
*/
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