1026 lines
23 KiB
C
1026 lines
23 KiB
C
/*-
|
||
* Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
|
||
* 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
|
||
* in this position and unchanged.
|
||
* 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. The name of the author may not be used to endorse or promote products
|
||
* derived from this software without specific prior written permission.
|
||
*
|
||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
||
*
|
||
* $FreeBSD$
|
||
*/
|
||
|
||
/*
|
||
* The following copyright applies to the base64 code:
|
||
*
|
||
*-
|
||
* Copyright 1997 Massachusetts Institute of Technology
|
||
*
|
||
* Permission to use, copy, modify, and distribute this software and
|
||
* its documentation for any purpose and without fee is hereby
|
||
* granted, provided that both the above copyright notice and this
|
||
* permission notice appear in all copies, that both the above
|
||
* copyright notice and this permission notice appear in all
|
||
* supporting documentation, and that the name of M.I.T. not be used
|
||
* in advertising or publicity pertaining to distribution of the
|
||
* software without specific, written prior permission. M.I.T. makes
|
||
* no representations about the suitability of this software for any
|
||
* purpose. It is provided "as is" without express or implied
|
||
* warranty.
|
||
*
|
||
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
|
||
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
|
||
* SHALL M.I.T. 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.
|
||
*/
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/socket.h>
|
||
|
||
#include <ctype.h>
|
||
#include <err.h>
|
||
#include <errno.h>
|
||
#include <locale.h>
|
||
#include <netdb.h>
|
||
#include <stdarg.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <time.h>
|
||
#include <unistd.h>
|
||
|
||
#include "fetch.h"
|
||
#include "common.h"
|
||
#include "httperr.h"
|
||
|
||
extern char *__progname; /* XXX not portable */
|
||
|
||
/* Maximum number of redirects to follow */
|
||
#define MAX_REDIRECT 5
|
||
|
||
/* Symbolic names for reply codes we care about */
|
||
#define HTTP_OK 200
|
||
#define HTTP_PARTIAL 206
|
||
#define HTTP_MOVED_PERM 301
|
||
#define HTTP_MOVED_TEMP 302
|
||
#define HTTP_SEE_OTHER 303
|
||
#define HTTP_NEED_AUTH 401
|
||
#define HTTP_NEED_PROXY_AUTH 403
|
||
#define HTTP_PROTOCOL_ERROR 999
|
||
|
||
#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
|
||
|| (xyz) == HTTP_MOVED_TEMP \
|
||
|| (xyz) == HTTP_SEE_OTHER)
|
||
|
||
|
||
|
||
/*****************************************************************************
|
||
* I/O functions for decoding chunked streams
|
||
*/
|
||
|
||
struct cookie
|
||
{
|
||
int fd;
|
||
char *buf;
|
||
size_t b_size;
|
||
size_t b_len;
|
||
int b_pos;
|
||
int eof;
|
||
int error;
|
||
long chunksize;
|
||
#ifndef NDEBUG
|
||
long total;
|
||
#endif
|
||
};
|
||
|
||
/*
|
||
* Get next chunk header
|
||
*/
|
||
static int
|
||
_http_new_chunk(struct cookie *c)
|
||
{
|
||
char *p;
|
||
|
||
if (_fetch_getln(c->fd, &c->buf, &c->b_size, &c->b_len) == -1)
|
||
return -1;
|
||
|
||
if (c->b_len < 2 || !ishexnumber(*c->buf))
|
||
return -1;
|
||
|
||
for (p = c->buf; !isspace(*p) && *p != ';' && p < c->buf + c->b_len; ++p)
|
||
if (!ishexnumber(*p))
|
||
return -1;
|
||
else if (isdigit(*p))
|
||
c->chunksize = c->chunksize * 16 + *p - '0';
|
||
else
|
||
c->chunksize = c->chunksize * 16 + 10 + tolower(*p) - 'a';
|
||
|
||
#ifndef NDEBUG
|
||
c->total += c->chunksize;
|
||
if (c->chunksize == 0)
|
||
fprintf(stderr, "\033[1m_http_fillbuf(): "
|
||
"end of last chunk\033[m\n");
|
||
else
|
||
fprintf(stderr, "\033[1m_http_fillbuf(): "
|
||
"new chunk: %ld (%ld)\033[m\n", c->chunksize, c->total);
|
||
#endif
|
||
|
||
return c->chunksize;
|
||
}
|
||
|
||
/*
|
||
* Fill the input buffer, do chunk decoding on the fly
|
||
*/
|
||
static int
|
||
_http_fillbuf(struct cookie *c)
|
||
{
|
||
if (c->error)
|
||
return -1;
|
||
if (c->eof)
|
||
return 0;
|
||
|
||
if (c->chunksize == 0) {
|
||
switch (_http_new_chunk(c)) {
|
||
case -1:
|
||
c->error = 1;
|
||
return -1;
|
||
case 0:
|
||
c->eof = 1;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if (c->b_size < c->chunksize) {
|
||
char *tmp;
|
||
|
||
if ((tmp = realloc(c->buf, c->chunksize)) == NULL)
|
||
return -1;
|
||
c->buf = tmp;
|
||
c->b_size = c->chunksize;
|
||
}
|
||
|
||
if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1)
|
||
return -1;
|
||
c->chunksize -= c->b_len;
|
||
|
||
if (c->chunksize == 0) {
|
||
char endl[2];
|
||
read(c->fd, endl, 2);
|
||
}
|
||
|
||
c->b_pos = 0;
|
||
|
||
return c->b_len;
|
||
}
|
||
|
||
/*
|
||
* Read function
|
||
*/
|
||
static int
|
||
_http_readfn(void *v, char *buf, int len)
|
||
{
|
||
struct cookie *c = (struct cookie *)v;
|
||
int l, pos;
|
||
|
||
if (c->error)
|
||
return -1;
|
||
if (c->eof)
|
||
return 0;
|
||
|
||
for (pos = 0; len > 0; pos += l, len -= l) {
|
||
/* empty buffer */
|
||
if (!c->buf || c->b_pos == c->b_len)
|
||
if (_http_fillbuf(c) < 1)
|
||
break;
|
||
l = c->b_len - c->b_pos;
|
||
if (len < l)
|
||
l = len;
|
||
bcopy(c->buf + c->b_pos, buf + pos, l);
|
||
c->b_pos += l;
|
||
}
|
||
|
||
if (!pos && c->error)
|
||
return -1;
|
||
return pos;
|
||
}
|
||
|
||
/*
|
||
* Write function
|
||
*/
|
||
static int
|
||
_http_writefn(void *v, const char *buf, int len)
|
||
{
|
||
struct cookie *c = (struct cookie *)v;
|
||
|
||
return write(c->fd, buf, len);
|
||
}
|
||
|
||
/*
|
||
* Close function
|
||
*/
|
||
static int
|
||
_http_closefn(void *v)
|
||
{
|
||
struct cookie *c = (struct cookie *)v;
|
||
int r;
|
||
|
||
r = close(c->fd);
|
||
if (c->buf)
|
||
free(c->buf);
|
||
free(c);
|
||
return r;
|
||
}
|
||
|
||
/*
|
||
* Wrap a file descriptor up
|
||
*/
|
||
static FILE *
|
||
_http_funopen(int fd)
|
||
{
|
||
struct cookie *c;
|
||
FILE *f;
|
||
|
||
if ((c = calloc(1, sizeof *c)) == NULL) {
|
||
_fetch_syserr();
|
||
return NULL;
|
||
}
|
||
c->fd = fd;
|
||
if (!(f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn))) {
|
||
_fetch_syserr();
|
||
free(c);
|
||
return NULL;
|
||
}
|
||
return f;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Helper functions for talking to the server and parsing its replies
|
||
*/
|
||
|
||
/* Header types */
|
||
typedef enum {
|
||
hdr_syserror = -2,
|
||
hdr_error = -1,
|
||
hdr_end = 0,
|
||
hdr_unknown = 1,
|
||
hdr_content_length,
|
||
hdr_content_range,
|
||
hdr_last_modified,
|
||
hdr_location,
|
||
hdr_transfer_encoding
|
||
} hdr;
|
||
|
||
/* Names of interesting headers */
|
||
static struct {
|
||
hdr num;
|
||
char *name;
|
||
} hdr_names[] = {
|
||
{ hdr_content_length, "Content-Length" },
|
||
{ hdr_content_range, "Content-Range" },
|
||
{ hdr_last_modified, "Last-Modified" },
|
||
{ hdr_location, "Location" },
|
||
{ hdr_transfer_encoding, "Transfer-Encoding" },
|
||
{ hdr_unknown, NULL },
|
||
};
|
||
|
||
static char *reply_buf;
|
||
static size_t reply_size;
|
||
static size_t reply_length;
|
||
|
||
/*
|
||
* Send a formatted line; optionally echo to terminal
|
||
*/
|
||
static int
|
||
_http_cmd(int fd, char *fmt, ...)
|
||
{
|
||
va_list ap;
|
||
size_t len;
|
||
char *msg;
|
||
int r;
|
||
|
||
va_start(ap, fmt);
|
||
len = vasprintf(&msg, fmt, ap);
|
||
va_end(ap);
|
||
|
||
if (msg == NULL) {
|
||
errno = ENOMEM;
|
||
_fetch_syserr();
|
||
return -1;
|
||
}
|
||
|
||
r = _fetch_putln(fd, msg, len);
|
||
free(msg);
|
||
|
||
if (r == -1) {
|
||
_fetch_syserr();
|
||
return -1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Get and parse status line
|
||
*/
|
||
static int
|
||
_http_get_reply(int fd)
|
||
{
|
||
char *p;
|
||
|
||
if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
|
||
return -1;
|
||
/*
|
||
* A valid status line looks like "HTTP/m.n xyz reason" where m
|
||
* and n are the major and minor protocol version numbers and xyz
|
||
* is the reply code.
|
||
* Unfortunately, there are servers out there (NCSA 1.5.1, to name
|
||
* just one) that do not send a version number, so we can't rely
|
||
* on finding one, but if we do, insist on it being 1.0 or 1.1.
|
||
* We don't care about the reason phrase.
|
||
*/
|
||
if (strncmp(reply_buf, "HTTP", 4) != 0)
|
||
return HTTP_PROTOCOL_ERROR;
|
||
p = reply_buf + 4;
|
||
if (*p == '/') {
|
||
if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
|
||
return HTTP_PROTOCOL_ERROR;
|
||
p += 4;
|
||
}
|
||
if (*p != ' '
|
||
|| !isdigit(p[1])
|
||
|| !isdigit(p[2])
|
||
|| !isdigit(p[3]))
|
||
return HTTP_PROTOCOL_ERROR;
|
||
|
||
return ((p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'));
|
||
}
|
||
|
||
/*
|
||
* Check a header; if the type matches the given string, return a
|
||
* pointer to the beginning of the value.
|
||
*/
|
||
static char *
|
||
_http_match(char *str, char *hdr)
|
||
{
|
||
while (*str && *hdr && tolower(*str++) == tolower(*hdr++))
|
||
/* nothing */;
|
||
if (*str || *hdr != ':')
|
||
return NULL;
|
||
while (*hdr && isspace(*++hdr))
|
||
/* nothing */;
|
||
return hdr;
|
||
}
|
||
|
||
/*
|
||
* Get the next header and return the appropriate symbolic code.
|
||
*/
|
||
static hdr
|
||
_http_next_header(int fd, char **p)
|
||
{
|
||
int i;
|
||
|
||
if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
|
||
return hdr_syserror;
|
||
while (reply_length && isspace(reply_buf[reply_length-1]))
|
||
reply_length--;
|
||
reply_buf[reply_length] = 0;
|
||
if (reply_length == 0)
|
||
return hdr_end;
|
||
/*
|
||
* We could check for malformed headers but we don't really care.
|
||
* A valid header starts with a token immediately followed by a
|
||
* colon; a token is any sequence of non-control, non-whitespace
|
||
* characters except "()<>@,;:\\\"{}".
|
||
*/
|
||
for (i = 0; hdr_names[i].num != hdr_unknown; i++)
|
||
if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL)
|
||
return hdr_names[i].num;
|
||
return hdr_unknown;
|
||
}
|
||
|
||
/*
|
||
* Parse a last-modified header
|
||
*/
|
||
static int
|
||
_http_parse_mtime(char *p, time_t *mtime)
|
||
{
|
||
char locale[64], *r;
|
||
struct tm tm;
|
||
|
||
strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale);
|
||
setlocale(LC_TIME, "C");
|
||
r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
|
||
/* XXX should add support for date-2 and date-3 */
|
||
setlocale(LC_TIME, locale);
|
||
if (r == NULL)
|
||
return -1;
|
||
DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
|
||
"%02d:%02d:%02d\033[m]\n",
|
||
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
|
||
tm.tm_hour, tm.tm_min, tm.tm_sec));
|
||
*mtime = timegm(&tm);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Parse a content-length header
|
||
*/
|
||
static int
|
||
_http_parse_length(char *p, off_t *length)
|
||
{
|
||
off_t len;
|
||
|
||
for (len = 0; *p && isdigit(*p); ++p)
|
||
len = len * 10 + (*p - '0');
|
||
DEBUG(fprintf(stderr, "content length: [\033[1m%lld\033[m]\n", len));
|
||
*length = len;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Parse a content-range header
|
||
*/
|
||
static int
|
||
_http_parse_range(char *p, off_t *offset, off_t *length, off_t *size)
|
||
{
|
||
int first, last, len;
|
||
|
||
if (strncasecmp(p, "bytes ", 6) != 0)
|
||
return -1;
|
||
for (first = 0, p += 6; *p && isdigit(*p); ++p)
|
||
first = first * 10 + *p - '0';
|
||
if (*p != '-')
|
||
return -1;
|
||
for (last = 0, ++p; *p && isdigit(*p); ++p)
|
||
last = last * 10 + *p - '0';
|
||
if (first > last || *p != '/')
|
||
return -1;
|
||
for (len = 0, ++p; *p && isdigit(*p); ++p)
|
||
len = len * 10 + *p - '0';
|
||
if (len < last - first + 1)
|
||
return -1;
|
||
DEBUG(fprintf(stderr, "content range: [\033[1m%d-%d/%d\033[m]\n",
|
||
first, last, len));
|
||
*offset = first;
|
||
*length = last - first + 1;
|
||
*size = len;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Helper functions for authorization
|
||
*/
|
||
|
||
/*
|
||
* Base64 encoding
|
||
*/
|
||
static char *
|
||
_http_base64(char *src)
|
||
{
|
||
static const char base64[] =
|
||
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
||
"abcdefghijklmnopqrstuvwxyz"
|
||
"0123456789+/";
|
||
char *str, *dst;
|
||
size_t l;
|
||
int t, r;
|
||
|
||
l = strlen(src);
|
||
if ((str = malloc(((l + 2) / 3) * 4)) == NULL)
|
||
return NULL;
|
||
dst = str;
|
||
r = 0;
|
||
|
||
while (l >= 3) {
|
||
t = (src[0] << 16) | (src[1] << 8) | src[2];
|
||
dst[0] = base64[(t >> 18) & 0x3f];
|
||
dst[1] = base64[(t >> 12) & 0x3f];
|
||
dst[2] = base64[(t >> 6) & 0x3f];
|
||
dst[3] = base64[(t >> 0) & 0x3f];
|
||
src += 3; l -= 3;
|
||
dst += 4; r += 4;
|
||
}
|
||
|
||
switch (l) {
|
||
case 2:
|
||
t = (src[0] << 16) | (src[1] << 8);
|
||
dst[0] = base64[(t >> 18) & 0x3f];
|
||
dst[1] = base64[(t >> 12) & 0x3f];
|
||
dst[2] = base64[(t >> 6) & 0x3f];
|
||
dst[3] = '=';
|
||
dst += 4;
|
||
r += 4;
|
||
break;
|
||
case 1:
|
||
t = src[0] << 16;
|
||
dst[0] = base64[(t >> 18) & 0x3f];
|
||
dst[1] = base64[(t >> 12) & 0x3f];
|
||
dst[2] = dst[3] = '=';
|
||
dst += 4;
|
||
r += 4;
|
||
break;
|
||
case 0:
|
||
break;
|
||
}
|
||
|
||
*dst = 0;
|
||
return str;
|
||
}
|
||
|
||
/*
|
||
* Encode username and password
|
||
*/
|
||
static int
|
||
_http_basic_auth(int fd, char *hdr, char *usr, char *pwd)
|
||
{
|
||
char *upw, *auth;
|
||
int r;
|
||
|
||
if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
|
||
return -1;
|
||
auth = _http_base64(upw);
|
||
free(upw);
|
||
if (auth == NULL)
|
||
return -1;
|
||
r = _http_cmd(fd, "%s: Basic %s", hdr, auth);
|
||
free(auth);
|
||
return r;
|
||
}
|
||
|
||
/*
|
||
* Send an authorization header
|
||
*/
|
||
static int
|
||
_http_authorize(int fd, char *hdr, char *p)
|
||
{
|
||
/* basic authorization */
|
||
if (strncasecmp(p, "basic:", 6) == 0) {
|
||
char *user, *pwd, *str;
|
||
int r;
|
||
|
||
/* skip realm */
|
||
for (p += 6; *p && *p != ':'; ++p)
|
||
/* nothing */ ;
|
||
if (!*p || strchr(++p, ':') == NULL)
|
||
return -1;
|
||
if ((str = strdup(p)) == NULL)
|
||
return -1; /* XXX */
|
||
user = str;
|
||
pwd = strchr(str, ':');
|
||
*pwd++ = '\0';
|
||
r = _http_basic_auth(fd, hdr, user, pwd);
|
||
free(str);
|
||
return r;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Helper functions for connecting to a server or proxy
|
||
*/
|
||
|
||
/*
|
||
* Return the default port for this scheme
|
||
*/
|
||
static int
|
||
_http_default_port(char *scheme)
|
||
{
|
||
struct servent *se;
|
||
|
||
if ((se = getservbyname(scheme, "tcp")) != NULL)
|
||
return ntohs(se->s_port);
|
||
if (strcasecmp(scheme, SCHEME_FTP) == 0)
|
||
return FTP_DEFAULT_PORT;
|
||
if (strcasecmp(scheme, SCHEME_HTTP) == 0)
|
||
return HTTP_DEFAULT_PORT;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Connect to the correct HTTP server or proxy.
|
||
*/
|
||
static int
|
||
_http_connect(struct url *URL, struct url *purl, char *flags)
|
||
{
|
||
int verbose;
|
||
int af, fd;
|
||
|
||
#ifdef INET6
|
||
af = AF_UNSPEC;
|
||
#else
|
||
af = AF_INET;
|
||
#endif
|
||
|
||
verbose = CHECK_FLAG('v');
|
||
if (CHECK_FLAG('4'))
|
||
af = AF_INET;
|
||
#ifdef INET6
|
||
else if (CHECK_FLAG('6'))
|
||
af = AF_INET6;
|
||
#endif
|
||
|
||
if (purl) {
|
||
URL = purl;
|
||
} else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) {
|
||
/* can't talk http to an ftp server */
|
||
/* XXX should set an error code */
|
||
return -1;
|
||
}
|
||
|
||
if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1)
|
||
/* _fetch_connect() has already set an error code */
|
||
return -1;
|
||
return fd;
|
||
}
|
||
|
||
static struct url *
|
||
_http_get_proxy()
|
||
{
|
||
struct url *purl;
|
||
char *p;
|
||
|
||
if ((p = getenv("HTTP_PROXY")) && (purl = fetchParseURL(p))) {
|
||
if (!*purl->scheme)
|
||
strcpy(purl->scheme, SCHEME_HTTP);
|
||
if (!purl->port)
|
||
purl->port = _http_default_port(SCHEME_HTTP);
|
||
if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
|
||
return purl;
|
||
fetchFreeURL(purl);
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Core
|
||
*/
|
||
|
||
/*
|
||
* Send a request and process the reply
|
||
*/
|
||
FILE *
|
||
_http_request(struct url *URL, char *op, struct url_stat *us,
|
||
struct url *purl, char *flags)
|
||
{
|
||
struct url *url, *new;
|
||
int chunked, direct, need_auth, noredirect, verbose;
|
||
int code, fd, i, n;
|
||
off_t offset, clength, length, size;
|
||
time_t mtime;
|
||
char *p;
|
||
FILE *f;
|
||
hdr h;
|
||
char *host;
|
||
#ifdef INET6
|
||
char hbuf[MAXHOSTNAMELEN + 1];
|
||
#endif
|
||
|
||
direct = CHECK_FLAG('d');
|
||
noredirect = CHECK_FLAG('A');
|
||
verbose = CHECK_FLAG('v');
|
||
|
||
if (direct && purl) {
|
||
fetchFreeURL(purl);
|
||
purl = NULL;
|
||
}
|
||
|
||
/* try the provided URL first */
|
||
url = URL;
|
||
|
||
/* if the A flag is set, we only get one try */
|
||
n = noredirect ? 1 : MAX_REDIRECT;
|
||
i = 0;
|
||
|
||
do {
|
||
new = NULL;
|
||
chunked = 0;
|
||
need_auth = 0;
|
||
offset = 0;
|
||
clength = -1;
|
||
length = -1;
|
||
size = -1;
|
||
mtime = 0;
|
||
retry:
|
||
/* check port */
|
||
if (!url->port)
|
||
url->port = _http_default_port(url->scheme);
|
||
|
||
/* connect to server or proxy */
|
||
if ((fd = _http_connect(url, purl, flags)) == -1)
|
||
goto ouch;
|
||
|
||
host = url->host;
|
||
#ifdef INET6
|
||
if (strchr(url->host, ':')) {
|
||
snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
|
||
host = hbuf;
|
||
}
|
||
#endif
|
||
|
||
/* send request */
|
||
if (verbose)
|
||
_fetch_info("requesting %s://%s:%d%s",
|
||
url->scheme, host, url->port, url->doc);
|
||
if (purl) {
|
||
_http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1",
|
||
op, url->scheme, host, url->port, url->doc);
|
||
} else {
|
||
_http_cmd(fd, "%s %s HTTP/1.1",
|
||
op, url->doc);
|
||
}
|
||
|
||
/* proxy authorization */
|
||
if (purl) {
|
||
if (*purl->user || *purl->pwd)
|
||
_http_basic_auth(fd, "Proxy-Authorization",
|
||
purl->user, purl->pwd);
|
||
else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
|
||
_http_authorize(fd, "Proxy-Authorization", p);
|
||
}
|
||
|
||
/* server authorization */
|
||
if (need_auth) {
|
||
if (*url->user || *url->pwd)
|
||
_http_basic_auth(fd, "Authorization", url->user, url->pwd);
|
||
else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0')
|
||
_http_authorize(fd, "Authorization", p);
|
||
else {
|
||
_http_seterr(HTTP_NEED_AUTH);
|
||
goto ouch;
|
||
}
|
||
}
|
||
|
||
/* other headers */
|
||
if (url->port == _http_default_port(url->scheme))
|
||
_http_cmd(fd, "Host: %s", host);
|
||
else
|
||
_http_cmd(fd, "Host: %s:%d", host, url->port);
|
||
_http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, __progname);
|
||
if (url->offset)
|
||
_http_cmd(fd, "Range: bytes=%lld-", url->offset);
|
||
_http_cmd(fd, "Connection: close");
|
||
_http_cmd(fd, "");
|
||
|
||
/* get reply */
|
||
switch ((code = _http_get_reply(fd))) {
|
||
case HTTP_OK:
|
||
case HTTP_PARTIAL:
|
||
/* fine */
|
||
break;
|
||
case HTTP_MOVED_PERM:
|
||
case HTTP_MOVED_TEMP:
|
||
/*
|
||
* Not so fine, but we still have to read the headers to
|
||
* get the new location.
|
||
*/
|
||
break;
|
||
case HTTP_NEED_AUTH:
|
||
if (need_auth) {
|
||
/*
|
||
* We already sent out authorization code, so there's
|
||
* nothing more we can do.
|
||
*/
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
}
|
||
/* try again, but send the password this time */
|
||
if (verbose)
|
||
_fetch_info("server requires authorization");
|
||
need_auth = 1;
|
||
close(fd);
|
||
goto retry;
|
||
case HTTP_NEED_PROXY_AUTH:
|
||
/*
|
||
* If we're talking to a proxy, we already sent our proxy
|
||
* authorization code, so there's nothing more we can do.
|
||
*/
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
case HTTP_PROTOCOL_ERROR:
|
||
/* fall through */
|
||
case -1:
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
default:
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
}
|
||
|
||
/* get headers */
|
||
do {
|
||
switch ((h = _http_next_header(fd, &p))) {
|
||
case hdr_syserror:
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
case hdr_error:
|
||
_http_seterr(HTTP_PROTOCOL_ERROR);
|
||
goto ouch;
|
||
case hdr_content_length:
|
||
_http_parse_length(p, &clength);
|
||
break;
|
||
case hdr_content_range:
|
||
_http_parse_range(p, &offset, &length, &size);
|
||
break;
|
||
case hdr_last_modified:
|
||
_http_parse_mtime(p, &mtime);
|
||
break;
|
||
case hdr_location:
|
||
if (!HTTP_REDIRECT(code))
|
||
break;
|
||
if (new)
|
||
free(new);
|
||
if (verbose)
|
||
_fetch_info("%d redirect to %s", code, p);
|
||
if (*p == '/')
|
||
/* absolute path */
|
||
new = fetchMakeURL(url->scheme, url->host, url->port, p,
|
||
url->user, url->pwd);
|
||
else
|
||
new = fetchParseURL(p);
|
||
if (new == NULL) {
|
||
/* XXX should set an error code */
|
||
DEBUG(fprintf(stderr, "failed to parse new URL\n"));
|
||
goto ouch;
|
||
}
|
||
if (!*new->user && !*new->pwd) {
|
||
strcpy(new->user, url->user);
|
||
strcpy(new->pwd, url->pwd);
|
||
}
|
||
new->offset = url->offset;
|
||
new->length = url->length;
|
||
break;
|
||
case hdr_transfer_encoding:
|
||
/* XXX weak test*/
|
||
chunked = (strcasecmp(p, "chunked") == 0);
|
||
break;
|
||
case hdr_end:
|
||
/* fall through */
|
||
case hdr_unknown:
|
||
/* ignore */
|
||
break;
|
||
}
|
||
} while (h > hdr_end);
|
||
|
||
/* we either have a hit, or a redirect with no Location: header */
|
||
if (code == HTTP_OK || code == HTTP_PARTIAL || !new)
|
||
break;
|
||
|
||
/* we have a redirect */
|
||
close(fd);
|
||
fd = -1;
|
||
if (url != URL)
|
||
fetchFreeURL(url);
|
||
url = new;
|
||
} while (++i < n);
|
||
|
||
/* no success */
|
||
if (fd == -1) {
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
}
|
||
|
||
DEBUG(fprintf(stderr, "offset %lld, length %lld, size %lld, clength %lld\n",
|
||
offset, length, size, clength));
|
||
|
||
/* check for inconsistencies */
|
||
if (clength != -1 && length != -1 && clength != length) {
|
||
_http_seterr(HTTP_PROTOCOL_ERROR);
|
||
goto ouch;
|
||
}
|
||
if (clength == -1)
|
||
clength = length;
|
||
if (clength != -1)
|
||
length = offset + clength;
|
||
if (length != -1 && size != -1 && length != size) {
|
||
_http_seterr(HTTP_PROTOCOL_ERROR);
|
||
goto ouch;
|
||
}
|
||
if (size == -1)
|
||
size = length;
|
||
|
||
/* fill in stats */
|
||
if (us) {
|
||
us->size = size;
|
||
us->atime = us->mtime = mtime;
|
||
}
|
||
|
||
/* too far? */
|
||
if (offset > URL->offset) {
|
||
_http_seterr(HTTP_PROTOCOL_ERROR);
|
||
goto ouch;
|
||
}
|
||
|
||
/* report back real offset and size */
|
||
URL->offset = offset;
|
||
URL->length = clength;
|
||
|
||
/* wrap it up in a FILE */
|
||
if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) {
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
}
|
||
|
||
if (url != URL)
|
||
fetchFreeURL(url);
|
||
if (purl)
|
||
fetchFreeURL(purl);
|
||
|
||
return f;
|
||
|
||
ouch:
|
||
if (url != URL)
|
||
fetchFreeURL(url);
|
||
if (purl)
|
||
fetchFreeURL(purl);
|
||
if (fd != -1)
|
||
close(fd);
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Entry points
|
||
*/
|
||
|
||
/*
|
||
* Retrieve and stat a file by HTTP
|
||
*/
|
||
FILE *
|
||
fetchXGetHTTP(struct url *URL, struct url_stat *us, char *flags)
|
||
{
|
||
return _http_request(URL, "GET", us, _http_get_proxy(), flags);
|
||
}
|
||
|
||
/*
|
||
* Retrieve a file by HTTP
|
||
*/
|
||
FILE *
|
||
fetchGetHTTP(struct url *URL, char *flags)
|
||
{
|
||
return fetchXGetHTTP(URL, NULL, flags);
|
||
}
|
||
|
||
/*
|
||
* Store a file by HTTP
|
||
*/
|
||
FILE *
|
||
fetchPutHTTP(struct url *URL, char *flags)
|
||
{
|
||
warnx("fetchPutHTTP(): not implemented");
|
||
return NULL;
|
||
}
|
||
|
||
/*
|
||
* Get an HTTP document's metadata
|
||
*/
|
||
int
|
||
fetchStatHTTP(struct url *URL, struct url_stat *us, char *flags)
|
||
{
|
||
FILE *f;
|
||
|
||
if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL)
|
||
return -1;
|
||
fclose(f);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* List a directory
|
||
*/
|
||
struct url_ent *
|
||
fetchListHTTP(struct url *url, char *flags)
|
||
{
|
||
warnx("fetchListHTTP(): not implemented");
|
||
return NULL;
|
||
}
|