busybox/wget.c

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/* vi: set sw=4 ts=4: */
/*
* wget - retrieve a file using HTTP
*
* Chip Rosenthal Covad Communications <chip@laserlink.net>
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*
* Note: According to RFC2616 section 3.6.1, "All HTTP/1.1 applications MUST be
* able to receive and decode the "chunked" transfer-coding, and MUST ignore
* chunk-extension extensions they do not understand."
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*
* This prevents this particular wget app from completely RFC compliant, and as
* such, prevents it from being used as a general purpose web browser... This
* is a design decision, since it makes the code smaller.
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*
*/
#include <stdio.h>
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#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
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#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
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#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>
#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
static void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path);
static FILE *open_socket(char *host, int port);
static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc);
static void progressmeter(int flag);
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/* Globals (can be accessed from signal handlers */
static off_t filesize = 0; /* content-length of the file */
#ifdef BB_FEATURE_WGET_STATUSBAR
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static char *curfile; /* Name of current file being transferred. */
static struct timeval start; /* Time a transfer started. */
static volatile unsigned long statbytes; /* Number of bytes transferred so far. */
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/* For progressmeter() -- number of seconds before xfer considered "stalled" */
static const int STALLTIME = 5;
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#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);
}
}
int wget_main(int argc, char **argv)
{
int n;
char *proxy, *proxy_host;
int uri_port, proxy_port;
char *s, buf[512];
struct stat sbuf;
FILE *sfp; /* socket to web server */
char *uri_host, *uri_path; /* parsed from command line url */
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... */
/*
* Crack command line.
*/
while ((n = getopt(argc, argv, "cqO:")) != EOF) {
switch (n) {
case 'c':
++do_continue;
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 = (strcmp(optarg, "-") == 0 ? (char *)1 : optarg);
break;
default:
show_usage();
}
}
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if (argc - optind != 1)
show_usage();
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/*
* Use the proxy if necessary.
*/
if ((proxy = getenv("http_proxy")) != NULL) {
proxy = xstrdup(proxy);
parse_url(proxy, &proxy_host, &proxy_port, &uri_path);
parse_url(argv[optind], &uri_host, &uri_port, &uri_path);
} else {
/*
* Parse url into components.
*/
parse_url(argv[optind], &uri_host, &uri_port, &uri_path);
proxy_host=uri_host;
proxy_port=uri_port;
}
/* Guess an output filename */
if (!fname_out) {
fname_out =
#ifdef BB_FEATURE_WGET_STATUSBAR
curfile =
#endif
get_last_path_component(uri_path);
if (fname_out==NULL || strlen(fname_out)<1) {
fname_out =
#ifdef BB_FEATURE_WGET_STATUSBAR
curfile =
#endif
"index.html";
}
#ifdef BB_FEATURE_WGET_STATUSBAR
} else {
curfile=argv[optind];
#endif
}
if (do_continue && !fname_out)
error_msg_and_die("cannot specify continue (-c) without a filename (-O)");
/*
* Open socket to server.
*/
sfp = open_socket(proxy_host, proxy_port);
/* Make the assumption that if the file already exists
* on disk that the intention is to continue downloading
* a previously aborted download -Erik */
if (stat(fname_out, &sbuf) == 0) {
++do_continue;
}
/*
* Open the output file stream.
*/
if (fname_out != (char *)1) {
output = xfopen( fname_out, (do_continue ? "a" : "w") );
} else {
output = stdout;
}
/*
* Determine where to start transfer.
*/
if (do_continue) {
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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;
}
/*
* Send HTTP request.
*/
fprintf(sfp, "GET http://%s:%d/%s HTTP/1.1\r\n",
uri_host, uri_port, uri_path);
fprintf(sfp, "Host: %s\r\nUser-Agent: Wget\r\n", uri_host);
if (do_continue)
fprintf(sfp, "Range: bytes=%ld-\r\n", beg_range);
fprintf(sfp,"Connection: close\r\n\r\n");
/*
* Retrieve HTTP response line and check for "200" status code.
*/
if (fgets(buf, sizeof(buf), sfp) == NULL) {
close_and_delete_outfile(output, fname_out, do_continue);
error_msg_and_die("no response from server");
}
for (s = buf ; *s != '\0' && !isspace(*s) ; ++s)
;
for ( ; isspace(*s) ; ++s)
;
switch (atoi(s)) {
case 0:
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case 200:
break;
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case 206:
if (do_continue)
break;
/*FALLTHRU*/
default:
close_and_delete_outfile(output, fname_out, do_continue);
chomp(buf);
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) {
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filesize = atol(s);
got_clen = 1;
continue;
}
if (strcasecmp(buf, "transfer-encoding") == 0) {
close_and_delete_outfile(output, fname_out, do_continue);
error_msg_and_die("server wants to do %s transfer encoding", s);
continue;
}
}
/*
* Retrieve HTTP body.
*/
#ifdef BB_FEATURE_WGET_STATUSBAR
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statbytes=0;
if (quiet_flag==FALSE)
progressmeter(-1);
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#endif
while (filesize > 0 && (n = fread(buf, 1, sizeof(buf), sfp)) > 0) {
fwrite(buf, 1, n, output);
#ifdef BB_FEATURE_WGET_STATUSBAR
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statbytes+=n;
if (quiet_flag==FALSE)
progressmeter(1);
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#endif
if (got_clen)
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filesize -= n;
}
if (n == 0 && ferror(sfp))
perror_msg_and_die("network read error");
exit(0);
}
void parse_url(char *url, char **uri_host, int *uri_port, char **uri_path)
{
char *cp, *sp;
*uri_port = 80;
if (strncmp(url, "http://", 7) != 0)
error_msg_and_die("not an http url: %s", url);
*uri_host = url + 7;
cp = strchr(*uri_host, ':');
sp = strchr(*uri_host, '/');
if (cp != NULL && (sp == NULL || cp < sp)) {
*cp++ = '\0';
*uri_port = atoi(cp);
}
if (sp != NULL) {
*sp++ = '\0';
*uri_path = sp;
} else
*uri_path = "";
}
FILE *open_socket(char *host, int port)
{
struct sockaddr_in sin;
struct hostent *hp;
int fd;
FILE *fp;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
if ((hp = (struct hostent *) gethostbyname(host)) == NULL)
error_msg_and_die("cannot resolve %s", host);
memcpy(&sin.sin_addr, hp->h_addr_list[0], hp->h_length);
sin.sin_port = htons(port);
/*
* Get the server onto a stdio stream.
*/
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror_msg_and_die("socket()");
if (connect(fd, (struct sockaddr *) &sin, sizeof(sin)) < 0)
perror_msg_and_die("connect(%s)", host);
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;
}
#ifdef BB_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.
*
*/
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static int
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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
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updateprogressmeter(int ignore)
{
int save_errno = errno;
progressmeter(0);
errno = save_errno;
}
static void
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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
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progressmeter(int flag)
{
static const char prefixes[] = " KMGTP";
static struct timeval lastupdate;
static off_t lastsize;
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;
}
(void) gettimeofday(&now, (struct timezone *) 0);
cursize = statbytes;
if (filesize != 0) {
ratio = 100.0 * cursize / filesize;
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 (statbytes <= 0 || elapsed <= 0.0 || cursize > filesize) {
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
" --:-- ETA");
} else if (wait.tv_sec >= STALLTIME) {
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
" - stalled -");
} else {
remaining = (int) (filesize / (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));
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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;
}
}
#endif
/* Original copyright notice which applies to the BB_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 1.29 2001/03/09 21:24:12 andersen Exp $
*/
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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