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busybox/networking/wget.c
Eric Andersen 3f1cf455a0 cope with crappy windoze ftp servers
2003-03-11 18:03:39 +00:00

842 lines
20 KiB
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>
*
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <getopt.h>
#include "busybox.h"
/* Stupid libc5 doesn't define this... */
#ifndef timersub
#define timersub(a, b, result) \
do { \
(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
if ((result)->tv_usec < 0) { \
--(result)->tv_sec; \
(result)->tv_usec += 1000000; \
} \
} while (0)
#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(char *host, int port);
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 off_t filesize = 0; /* content-length of the file */
static int chunked = 0; /* 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. */
static volatile unsigned long statbytes = 0; /* Number of bytes transferred so far. */
/* For progressmeter() -- number of seconds before xfer considered "stalled" */
static const int STALLTIME = 5;
#endif
static void close_and_delete_outfile(FILE* output, char *fname_out, int do_continue)
{
if (output != stdout && do_continue==0) {
fclose(output);
unlink(fname_out);
}
}
/* 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;
}
/* Write NMEMB elements of SIZE bytes from PTR to STREAM. Returns the
* number of elements written, and a short count if an eof or non-interrupt
* error is encountered. */
static size_t safe_fwrite(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t ret = 0;
do {
clearerr(stream);
ret += fwrite((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;
}
#define close_delete_and_die(s...) { \
close_and_delete_outfile(output, fname_out, do_continue); \
error_msg_and_die(s); }
#ifdef CONFIG_FEATURE_WGET_AUTHENTICATION
/*
* Base64-encode character string
* oops... isn't something similar in uuencode.c?
* It would be better to use already existing code
*/
char *base64enc(char *p, char *buf, int len) {
char al[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
"0123456789+/";
char *s = buf;
while(*p) {
if (s >= buf+len-4)
error_msg_and_die("buffer overflow");
*(s++) = al[(*p >> 2) & 0x3F];
*(s++) = al[((*p << 4) & 0x30) | ((*(p+1) >> 4) & 0x0F)];
*s = *(s+1) = '=';
*(s+2) = 0;
if (! *(++p)) break;
*(s++) = al[((*p << 2) & 0x3C) | ((*(p+1) >> 6) & 0x03)];
if (! *(++p)) break;
*(s++) = al[*(p++) & 0x3F];
}
return buf;
}
#endif
int wget_main(int argc, char **argv)
{
int n, try=5, status;
int port;
char *proxy = 0;
char *dir_prefix=NULL;
char *s, buf[512];
struct stat sbuf;
char extra_headers[1024];
char *extra_headers_ptr = extra_headers;
int extra_headers_left = sizeof(extra_headers);
int which_long_opt = 0, option_index = -1;
struct host_info server, target;
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 do_continue = 0; /* continue a prev transfer (-c) */
long beg_range = 0L; /* range at which continue begins */
int got_clen = 0; /* got content-length: from server */
FILE *output; /* socket to web server */
int quiet_flag = FALSE; /* Be verry, verry quiet... */
int noproxy = 0; /* Use proxies if env vars are set */
#define LONG_HEADER 1
#define LONG_PASSIVE 2
struct option long_options[] = {
{ "continue", 0, NULL, 'c' },
{ "quiet", 0, NULL, 'q' },
{ "output-document", 1, NULL, 'O' },
{ "header", 1, &which_long_opt, LONG_HEADER },
{ "proxy", 1, NULL, 'Y' },
{ "passive-ftp", 0, &which_long_opt, LONG_PASSIVE },
{ 0, 0, 0, 0 }
};
/*
* Crack command line.
*/
while ((n = getopt_long(argc, argv, "cqO:P:Y:", long_options, &option_index)) != EOF) {
switch (n) {
case 'c':
++do_continue;
break;
case 'P':
dir_prefix = optarg;
break;
case 'q':
quiet_flag = TRUE;
break;
case 'O':
/* can't set fname_out to NULL if outputting to stdout, because
* this gets interpreted as the auto-gen output filename
* case below - tausq@debian.org
*/
fname_out = optarg;
break;
case 'Y':
if (strcmp(optarg, "off") == 0)
noproxy=1;
break;
case 0:
switch (which_long_opt) {
case LONG_HEADER: {
int arglen = strlen(optarg);
if(extra_headers_left - arglen - 2 <= 0)
error_msg_and_die("extra_headers buffer too small(need %i)", extra_headers_left - arglen);
strcpy(extra_headers_ptr, optarg);
extra_headers_ptr += arglen;
extra_headers_left -= ( arglen + 2 );
*extra_headers_ptr++ = '\r';
*extra_headers_ptr++ = '\n';
*(extra_headers_ptr + 1) = 0;
break;
}
case LONG_PASSIVE:
// ignore -- we always use passive mode
break;
}
break;
default:
show_usage();
}
}
if (argc - optind != 1)
show_usage();
parse_url(argv[optind], &target);
server.host = target.host;
server.port = target.port;
/*
* Use the proxy if necessary.
*/
if (!noproxy) {
proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
if (proxy)
parse_url(xstrdup(proxy), &server);
}
/* Guess an output filename */
if (!fname_out) {
fname_out =
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
curfile =
#endif
get_last_path_component(target.path);
if (fname_out==NULL || strlen(fname_out)<1) {
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 = get_last_path_component(fname_out);
#endif
}
if (do_continue && !fname_out)
error_msg_and_die("cannot specify continue (-c) without a filename (-O)");
/*
* Open the output file stream.
*/
if (strcmp(fname_out, "-") == 0) {
output = stdout;
quiet_flag = TRUE;
} else {
output = xfopen(fname_out, (do_continue ? "a" : "w"));
}
/*
* Determine where to start transfer.
*/
if (do_continue) {
if (fstat(fileno(output), &sbuf) < 0)
perror_msg_and_die("fstat()");
if (sbuf.st_size > 0)
beg_range = sbuf.st_size;
else
do_continue = 0;
}
if (proxy || !target.is_ftp) {
/*
* HTTP session
*/
do {
if (! --try)
close_delete_and_die("too many redirections");
/*
* Open socket to http server
*/
if (sfp) fclose(sfp);
sfp = open_socket(server.host, server.port);
/*
* Send HTTP request.
*/
if (proxy) {
fprintf(sfp, "GET %stp://%s:%d/%s HTTP/1.1\r\n",
target.is_ftp ? "f" : "ht", target.host,
target.port, target.path);
} else {
fprintf(sfp, "GET /%s HTTP/1.1\r\n", target.path);
}
fprintf(sfp, "Host: %s\r\nUser-Agent: Wget\r\n", target.host);
#ifdef CONFIG_FEATURE_WGET_AUTHENTICATION
if (target.user) {
fprintf(sfp, "Authorization: Basic %s\r\n",
base64enc(target.user, buf, sizeof(buf)));
}
if (proxy && server.user) {
fprintf(sfp, "Proxy-Authorization: Basic %s\r\n",
base64enc(server.user, buf, sizeof(buf)));
}
#endif
if (do_continue)
fprintf(sfp, "Range: bytes=%ld-\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)
close_delete_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:
if (do_continue && output != stdout)
output = freopen(fname_out, "w", output);
do_continue = 0;
break;
case 300: /* redirection */
case 301:
case 302:
case 303:
break;
case 206:
if (do_continue)
break;
/*FALLTHRU*/
default:
chomp(buf);
close_delete_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) {
filesize = atol(s);
got_clen = 1;
continue;
}
if (strcasecmp(buf, "transfer-encoding") == 0) {
if (strcasecmp(s, "chunked") == 0) {
chunked = got_clen = 1;
} else {
close_delete_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 (!proxy) {
server.host = target.host;
server.port = target.port;
}
}
}
}
} while(status >= 300);
dfp = sfp;
}
else
{
/*
* FTP session
*/
if (! target.user)
target.user = xstrdup("anonymous:busybox@");
sfp = open_socket(server.host, server.port);
if (ftpcmd(NULL, NULL, sfp, buf) != 220)
close_delete_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:
close_delete_and_die("ftp login: %s", buf+4);
}
ftpcmd("CDUP", NULL, sfp, buf);
ftpcmd("TYPE I", NULL, sfp, buf);
/*
* Querying file size
*/
if (ftpcmd("SIZE /", target.path, sfp, buf) == 213) {
filesize = atol(buf+4);
got_clen = 1;
}
/*
* Entering passive mode
*/
if (ftpcmd("PASV", NULL, sfp, buf) != 227)
close_delete_and_die("PASV: %s", buf+4);
s = strrchr(buf, ',');
*s = 0;
port = atoi(s+1);
s = strrchr(buf, ',');
port += atoi(s+1) * 256;
dfp = open_socket(server.host, port);
if (do_continue) {
sprintf(buf, "REST %ld", beg_range);
if (ftpcmd(buf, NULL, sfp, buf) != 350) {
if (output != stdout)
output = freopen(fname_out, "w", output);
do_continue = 0;
} else
filesize -= beg_range;
}
if (ftpcmd("RETR /", target.path, sfp, buf) > 150)
close_delete_and_die("RETR: %s", buf+4);
}
/*
* Retrieve file
*/
if (chunked) {
fgets(buf, sizeof(buf), dfp);
filesize = strtol(buf, (char **) NULL, 16);
}
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
if (quiet_flag==FALSE)
progressmeter(-1);
#endif
do {
while ((filesize > 0 || !got_clen) && (n = safe_fread(buf, 1, chunked ? (filesize > sizeof(buf) ? sizeof(buf) : filesize) : sizeof(buf), dfp)) > 0) {
if (safe_fwrite(buf, 1, n, output) != n)
perror_msg_and_die("write error");
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
statbytes+=n;
#endif
if (got_clen)
filesize -= n;
}
if (chunked) {
safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
safe_fgets(buf, sizeof(buf), dfp);
filesize = strtol(buf, (char **) NULL, 16);
if (filesize==0) chunked = 0; /* all done! */
}
if (n == 0 && ferror(dfp))
perror_msg_and_die("network read error");
} while (chunked);
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
if (quiet_flag==FALSE)
progressmeter(1);
#endif
if (!proxy && target.is_ftp) {
fclose(dfp);
if (ftpcmd(NULL, NULL, sfp, buf) != 226)
error_msg_and_die("ftp error: %s", buf+4);
ftpcmd("QUIT", NULL, sfp, buf);
}
exit(EXIT_SUCCESS);
}
void parse_url(char *url, struct host_info *h)
{
char *cp, *sp, *up;
if (strncmp(url, "http://", 7) == 0) {
h->port = 80;
h->host = url + 7;
h->is_ftp = 0;
} else if (strncmp(url, "ftp://", 6) == 0) {
h->port = 21;
h->host = url + 6;
h->is_ftp = 1;
} else
error_msg_and_die("not an http or ftp url: %s", url);
sp = strchr(h->host, '/');
if (sp != NULL) {
*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;
cp = strchr(h->host, ':');
if (cp != NULL) {
*cp++ = '\0';
h->port = atoi(cp);
}
}
FILE *open_socket(char *host, int port)
{
int fd;
FILE *fp;
char port_str[10];
snprintf(port_str, sizeof(port_str), "%d", port);
fd=xconnect(host, port_str);
/*
* Get the server onto a stdio stream.
*/
if ((fp = fdopen(fd, "r+")) == NULL)
perror_msg_and_die("fdopen()");
return fp;
}
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 != ':')
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)
{
char *p;
if (s1) {
if (!s2) s2="";
fprintf(fp, "%s%s\r\n", s1, s2);
fflush(fp);
}
do {
p = fgets(buf, 510, fp);
if (!p)
perror_msg_and_die("fgets()");
} 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)
{
struct winsize winsize;
if (ioctl(fileno(stdout), TIOCGWINSZ, &winsize) != -1)
return (winsize.ws_col ? winsize.ws_col : 80);
else
return (80);
}
static void
updateprogressmeter(int ignore)
{
int save_errno = errno;
progressmeter(0);
errno = save_errno;
}
static void
alarmtimer(int wait)
{
struct itimerval itv;
itv.it_value.tv_sec = wait;
itv.it_value.tv_usec = 0;
itv.it_interval = itv.it_value;
setitimer(ITIMER_REAL, &itv, NULL);
}
static void
progressmeter(int flag)
{
static const char prefixes[] = " KMGTP";
static struct timeval lastupdate;
static off_t lastsize, totalsize;
struct timeval now, td, wait;
off_t cursize, abbrevsize;
double elapsed;
int ratio, barlength, i, remaining;
char buf[256];
if (flag == -1) {
(void) gettimeofday(&start, (struct timezone *) 0);
lastupdate = start;
lastsize = 0;
totalsize = filesize; /* as filesize changes.. */
}
(void) gettimeofday(&now, (struct timezone *) 0);
cursize = statbytes;
if (totalsize != 0 && !chunked) {
ratio = 100.0 * cursize / totalsize;
ratio = MAX(ratio, 0);
ratio = MIN(ratio, 100);
} else
ratio = 100;
snprintf(buf, sizeof(buf), "\r%-20.20s %3d%% ", curfile, ratio);
barlength = getttywidth() - 51;
if (barlength > 0) {
i = barlength * ratio / 100;
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
"|%.*s%*s|", i,
"*****************************************************************************"
"*****************************************************************************",
barlength - i, "");
}
i = 0;
abbrevsize = cursize;
while (abbrevsize >= 100000 && i < sizeof(prefixes)) {
i++;
abbrevsize >>= 10;
}
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " %5d %c%c ",
(int) abbrevsize, prefixes[i], prefixes[i] == ' ' ? ' ' :
'B');
timersub(&now, &lastupdate, &wait);
if (cursize > lastsize) {
lastupdate = now;
lastsize = cursize;
if (wait.tv_sec >= STALLTIME) {
start.tv_sec += wait.tv_sec;
start.tv_usec += wait.tv_usec;
}
wait.tv_sec = 0;
}
timersub(&now, &start, &td);
elapsed = td.tv_sec + (td.tv_usec / 1000000.0);
if (wait.tv_sec >= STALLTIME) {
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
" - stalled -");
} else if (statbytes <= 0 || elapsed <= 0.0 || cursize > totalsize || chunked) {
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
" --:-- ETA");
} else {
remaining = (int) (totalsize / (statbytes / elapsed) - elapsed);
i = remaining / 3600;
if (i)
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
"%2d:", i);
else
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
" ");
i = remaining % 3600;
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
"%02d:%02d ETA", i / 60, i % 60);
}
write(fileno(stderr), buf, strlen(buf));
if (flag == -1) {
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) {
alarmtimer(0);
statbytes = 0;
putc('\n', stderr);
}
}
#endif
/* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
* much of which was blatently 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 1.52 2003/03/11 18:03:39 andersen Exp $
*/
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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